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#REDIRECT [[Ceramic]]
{{refimprove|date=February 2009}}
'''Ceramic materials''' are [[inorganic]], [[nonmetal|non-metallic]] raw materials and things made from them. They may be [[crystalline]] or partly crystalline. They are formed by the action of heat and subsequent cooling.<ref>[http://www.ctioa.org/index.cfm?pi=GL&gaction=list&grp=C Ceramic Tile and Stone Standards]</ref> [[Clay]] was one of the earliest materials used to produce [[ceramic]]s, but many different ceramic materials are now used in domestic, industrial and building products.


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== Types of ceramic materials ==

A ceramic material may be defined as any inorganic crystalline oxide material. It is solid and inert. Ceramic materials are brittle, hard, strong in compression, weak in shearing and tension. They withstand chemical erosion that occur in an acidic or caustic environment. In many cases withstanding erosion from the acid and bases applied to it. Ceramics generally can withstand very high temperatures such as temperatures that range from 1,000 °C to 1,600 °C (1,800 °F to 3,000 °F). Exceptions include inorganic materials that do not have oxygen such silicon carbide. Glass by definition is not a ceramic because it is an amorphous solid (non-crystalline). However, glass involves several steps of the ceramic process and its mechanical properties behave similarly to ceramic materials.

Traditional ceramic raw materials include clay minerals such as kaolinite, more recent materials include aluminium oxide, more commonly known as alumina. The modern ceramic materials, which are classified as advanced ceramics, include silicon carbide and tungsten carbide. Both are valued for their abrasion resistance, and hence find use in applications such as the wear plates of crushing equipment in mining operations. Advanced ceramics are also used in the medicine, electrical and electronics industries.

===Crystalline ceramics===
Crystalline ceramic materials are not amenable to a great range of processing. Methods for dealing with them tend to fall into one of two categories - either make the ceramic in the desired shape, by reaction in situ, or by "forming" powders into the desired shape, and then [[sintering]] to form a solid body. [[Ceramic forming techniques]] include shaping by hand (sometimes including a rotation process called "throwing"), [[Slipcasting|slip casting]], [[tape casting]] (used for making very thin ceramic capacitors, etc.), injection moulding, dry pressing, and other variations. (See also Ceramic forming techniques. Details of these processes are described in the two books listed below.) A few methods use a hybrid between the two approaches.

===Non-crystalline ceramics===
Non-crystalline ceramics, being glasses, tend to be formed from melts. The glass is shaped when either fully molten, by casting, or when in a state of toffee-like viscosity, by methods such as blowing to a mold. If later heat-treatments cause this class to become partly crystalline, the resulting material is known as a [[glass-ceramic]].

== Properties of ceramics ==
The physical properties of any ceramic substance are a direct result of its crystalline structure and chemical composition. [[Solid State]] [[Chemistry]] reveals the fundamental connection between microstructure and properties such as localized density variations, grain size distribution, type of porosity and second-phase content, which can all be correlated with ceramic properties such as mechanical strength σ by the Hall-Petch equation, [[hardness]], [[toughness]], [[dielectric constant]], and the [[optical]] properties exhibited by [[transparent materials]].

Physical properties of chemical compounds which provide evidence of chemical composition include odor, color, volume, density (mass / volume), melting point, boiling point, heat capacity, physical form at room temperature (solid, liquid or gas), hardness, porosity, and index of refraction.

[[Ceramography]] is the art and science of preparation, examination and evaluation of ceramic microstructures. Evaluation and characterization of ceramic microstructures is often implemented on similar spatial scales to that used commonly in the emerging field of nanotechnolgy: from tens of angstroms (A) to tens of micrometres (µm). This is typically somewhere between the minimum wavelength of visible light and the resolution limit of the naked eye.

The microstructure includes most grains, secondary phases, grain boundaries, pores, micro-cracks, structural defects and hardness microindentions. Most bulk mechanical, optical, thermal, electrical and magnetic properties are significantly affected by the observed microstructure. The fabrication method and process conditions are generally indicated by the microstructure. The root cause of many ceramic failures is evident in the cleaved and polished microstructure. Physical properties which constitute the emerging field of [[Materials Science]] and [[Engineering]] include the following:

=== Mechanical properties ===
Mechanical properties are important in structural and building materials as well as textile fabrics. They include the many properties used to describe the [[strength]] of materials such as: [[elasticity]] / [[plasticity]], [[tensile strength]], [[compressive strength]], [[shear strength]], [[fracture toughness]] & [[ductility]] (low in [[brittle]] materials), and [[indentation hardness]].

[[Fracture mechanics]] is the field of mechanics concerned with the study of the formation and subsequent propagation of micro[[cracks]] in materials. It uses methods of analytical solid mechanics to calculate the thermodynamic driving force on a crack and the methods of experimental solid mechanics to characterize the material's resistance to fracture and catastrophic failure.

In modern [[materials science]], fracture mechanics is an important tool in improving the mechanical performance of materials and components. It applies the [[physics]] of [[stress]] and [[strain]], in particular the theories of [[elasticity]] and [[plasticity]], to the microscopic [[crystallographic defects]] found in real materials in order to predict the macroscopic mechanical failure of bodies. [[Fractography]] is widely used with fracture mechanics to understand the causes of failures and also verify the theoretical [[failure]] predictions with real life failures.

Thus, since cracks and other microstructural defects can lower the strength of a structure beyond that which might be predicted by the theory of crystalline objects, a different property of tee material -- above and beyond conventional strength -- is needed to describe the fracture resistance of engineering materials. This is the reason for the need for fracture mechanics: the evaluation of the strength of flawed structures.

In this context, [[Fracture toughness]] is a property which describes the ability of a material containing a crack to resist fracture, and is one of the most important properties of any material for virtually all design applications. Fracture toughness is a quantitative way of expressing a material's resistance to [[brittle]] fracture when a crack is present. If a material has a large value of fracture toughness it will probably undergo [[ductile]] fracture. Brittle fracture is very characteristic of materials with a low fracture toughness value. [[Fracture mechanics]], which leads to the concept of fracture toughness, was largely based on the work of [[A. A. Griffith]] who, amongst other things, studied the behaviour of cracks in brittle materials.

Ceramic materials are usually [[ionic bond|ionic]] or [[covalent]] bonded materials, and can be [[crystal]]line or [[amorphous solid|amorphous]]. A material held together by either type of bond will tend to [[Fracture#Brittle fracture|fracture]] before any [[plastic deformation]] takes place, which results in poor [[toughness]] in these materials. Additionally, because these materials tend to be porous, the [[porosity|pore]]s and other microscopic imperfections act as [[Stress concentration|stress concentrators]], decreasing the toughness further, and reducing the [[tensile strength]]. These combine to give [[catastrophic failure]]s, as opposed to the normally much more gentle [[failure mode]]s of metals.

These materials do show [[plasticity (physics)|plastic deformation]]. However, due to the rigid structure of the crystalline materials, there are very few available [[slip system]]s for [[dislocation]]s to move, and so they deform very slowly. With the non-crystalline (glassy) materials, [[Viscosity|viscous]] flow is the dominant source of plastic deformation, and is also very slow. It is therefore neglected in many applications of ceramic materials.

=== Electrical properties ===
==== Semiconductors ====
Some ceramics are [[semiconductor]]s. Most of these are [[transition metal oxides]] that are II-VI semiconductors, such as [[zinc oxide]].

While there is talk of making blue [[LED]]s from [[zinc oxide]], ceramicists are most interested in the electrical properties that show grain boundary effects.

One of the most widely used of these is the varistor. These are devices that exhibit the property that resistance drops sharply at a certain [[threshold voltage]]. Once the voltage across the device reaches the threshold, there is a [[Electrical breakdown|breakdown]] of the electrical structure in the vicinity of the [[grain boundary|grain boundaries]], which results in its [[electrical resistance]] dropping from several megohms down to a few hundred [[Ohm (unit)|ohm]]s. The major advantage of these is that they can dissipate a lot of energy, and they self reset &mdash; after the voltage across the device drops below the threshold, its resistance returns to being high.

This makes them ideal for [[Surge protector|surge-protection]] applications. As there is control over the threshold voltage and energy tolerance, they find use in all sorts of applications. The best demonstration of their ability can be found in [[electrical substation]]s, where they are employed to protect the infrastructure from [[lightning]] strikes. They have rapid response, are low maintenance, and do not appreciably degrade from use, making them virtually ideal devices for this application.

Semiconducting ceramics are also employed as [[gas sensor]]s. When various gases are passed over a polycrystalline ceramic, its electrical resistance changes. With tuning to the possible gas mixtures, very inexpensive devices can be produced.

==== Superconductivity ====
Under some conditions, such as extremely low temperature, some ceramics exhibit [[high temperature superconductivity]]. The exact reason for this is not known, but there are two major families of superconducting ceramics.

====Ferroelectricity and supersets====
[[Piezoelectricity]], a link between electrical and mechanical response, is exhibited by a large number of ceramic materials, including the quartz used to [[crystal oscillator|measure time]] in watches and other electronics. Such devices use both properties of piezoelectrics, using electricity to produce a mechanical motion (powering the device) and then using this mechanical motion to produce electricity (generating a signal). The unit of time measured is the natural interval required for electricity to be converted into mechanical energy and back again.

The piezoelectric effect is generally stronger in materials that also exhibit [[pyroelectricity]], and all pyroelectric materials are also piezoelectric. These materials can be used to inter convert between thermal, mechanical, and/or electrical energy; for instance, after synthesis in a furnace, a pyroelectric crystal allowed to cool under no applied stress generally builds up a static charge of thousands of volts. Such materials are used in [[motion sensor]]s, where the tiny rise in temperature from a warm body entering the room is enough to produce a measurable voltage in the crystal.

In turn, pyroelectricity is seen most strongly in materials which also display the [[ferroelectric effect]], in which a stable electric dipole can be oriented or reversed by applying an electrostatic field. Pyroelectricity is also a necessary consequence of ferroelectricity. This can be used to store information in [[ferroelectric capacitor]]s, elements of [[ferroelectric RAM]].

The most common such materials are [[lead zirconate titanate]] and [[barium titanate]]. Aside from the uses mentioned above, their strong piezoelectric response is exploited in the design of high-frequency [[loudspeaker]]s, transducers for [[sonar]], and actuators for [[atomic force microscope|atomic force]] and [[scanning tunneling microscope]]s.

====Positive thermal coefficient====
Increases in temperature can cause grain boundaries to suddenly become insulating in some semiconducting ceramic materials, mostly mixtures of [[heavy metals|heavy metal]] [[titanate]]s. The critical transition temperature can be adjusted over a wide range by variations in chemistry. In such materials, current will pass through the material until [[joule heating]] brings it to the transition temperature, at which point the circuit will be broken and current flow will cease. Such ceramics are used as self-controlled heating elements in, for example, the rear-window defrost circuits of automobiles.

At the transition temperature, the material's [[dielectric]] response becomes theoretically infinite. While a lack of temperature control would rule out any practical use of the material near its critical temperature, the dielectric effect remains exceptionally strong even at much higher temperatures. Titanates with critical temperatures far below room temperature have become synonymous with "ceramic" in the context of ceramic capacitors for just this reason.

=== Optical and Far-Infrared properties ===
[[Optics|Optically transparent materials]] focus on the response of a material to incoming lightwaves of a range of wavelengths. [[Optical filter|Frequency selective optical filters]] can be utilized to alter or enhance the brightness and contrast of a digital image. Guided lightwave transmission via frequency selective [[waveguides]] involves the emerging field of fiber [[optics]] and the ability of certain glassy compositions as a [[transmission medium]] for a range of frequencies simultaneously ([[multi-mode optical fiber]]) with little or no [[interference]] between competing [[wavelengths]] or frequencies. This [[resonant]] [[mode]] of [[energy]] & [[data]] [[transmission]] via electromagnetic (light) [[wave propagation]], though low powered, is virtually lossless. Optical waveguides are used as components in [[Integrated optical circuit]]s (e.g. [[light-emitting diodes]], LEDs) or as the transmission medium in local and long haul [[optical communication]] systems. Also of value to the emerging materials scientist is the sensitivity of materials to radiation in the thermal [[infrared]] (IR) portion of the electromagnetic spectrum. This heat-seeking ability is responsible for such diverse optical phenomena as [[Night-vision]] and IR [[luminescence]].

Thus, there is an increasing need in the [[military]] sector for high-strength, robust materials which have the capability to [[transmit]] [[light]] ([[electromagnetic waves]]) in the [[visible]] (0.2 – 0.8 micrometre) and mid-[[Infrared]] (1 – 5 micrometres) regions of the [[spectrum]]. These materials are needed for applications requiring [[transparent]] armor, including next-generation high-speed [[missiles]] and pods, as well as protection against improves explosive devices (IED).

In the 1960s, scientists at General Electric (GE) discovered that under the right manufacturing conditions, some ceramics, especially [[aluminium oxide]] (aka: alumina or sapphire), could be made [[translucent]]. These translucent materials were transparent enough to be used for containing the electrical [[plasma]] generated in high-[[pressure]] [[sodium]] street lamps. During the past two decades, additional types of transparent ceramics have been developed for applications such as nose cones for [[heat-seeking]] [[missiles]], [[windows]] for fighter [[aircraft]], and [[scintillation]] counters for computed [[tomography]] [[scanners]].

In the early 1970s, during the first part of a 33-year career at GE, Livermore physical chemist Thomas Soules pioneered computer modeling of light transmission through translucent ceramic alumina. His model showed that microscopic [[pores]] in ceramic, mainly trapped at the junctions of microcrystalline [[grains]], caused light to [[scatter]] and prevented true transparency. The volume fraction of these microscopic pores had to be less than 1% for high-quality optical transmission. I.E. the [[density]] had to be 99.99 percent of the theoretical crystalline density.

This is basically a [[particle size]] effect. [[Opacity]] results from the [[incoherent scattering]] of light at surfaces and [[interfaces]]. In addition to pores, most of the interfaces in a typical metal or ceramic object are in the form of [[grain boundaries[[ which separate tiny regions of crystalline order. When the size of the scattering center (or grain boundary) is reduced below the size of the wavelength of the light being scattered, the scattering no longer occurs to any significant extent.

In the formation of [[polycrystalline]] materials ([[metals]] and [[ceramics]]) the size of the [[crystalline]] [[grains]] is determined largely by the size of the crystalline [[wiktionary:Particles|particles]] present in the raw material during formation (or pressing) of the object. Moreover, the size of the [[grain boundaries]] scales directly with particle size. Thus a reduction of the original particle size below the [[wavelength]] of [[visible light]] (~ 0.3 micrometres for shortwave violet) eliminates any light [[scattering]], resulting in a [[transparent]] material.

Recently, Japanese scientists have developed techniques to produce ceramic parts that rival the [[transparency]] of traditional crystals (grown from a single seed) and exceed the [[fracture toughness]] of a single crystal. In particular, scientists at the Japanese firm Konoshima Ltd., a producer of ceramic construction materials and industrial chemicals, have been looking for markets for their transparent ceramics.

Livermore researchers realized that these ceramics might greatly benefit high-powered [[lasers]] used in the National Ignition Facility (NIF) Programs Directorate. In particular, a Livermore research team began to acquire advanced transparent ceramics from Konoshima to determine if they could meet the [[optical]] requirements needed for Livermore’s Solid-State Heat Capacity Laser (SSHCL). Livermore researchers have also been testing applications of these materials for applications such as advanced drivers for laser-driven [[fusion]] power plants.

==Examples of ceramics materials==

Until the 1950s the most important ceramic materials were (1) [[pottery]], [[brick]]s and [[tile]]s, (2) [[cement]]s and (3) [[glass]]. A [[composite material]] of ceramic and [[metal]] is known as [[cermet]].

* [[Barium titanate]] (often mixed with [[strontium titanate]]) displays [[ferroelectricity]], meaning that its mechanical, electrical, and thermal responses are coupled to one another and also history-dependent. It is widely used in [[electromechanics|electromechanical]] [[transducer]]s, ceramic [[capacitor]]s, and [[Ferroelectric RAM|data storage]] elements. [[crystallite|Grain boundary]] conditions can create [[positive temperature coefficient|PTC]] effects in [[heating element]]s.
* [[Bismuth strontium calcium copper oxide]], a [[high-temperature superconductor]]
* [[Boron nitride]] is structurally [[isoelectronic]] to carbon and takes on similar physical forms: a [[graphite]]-like one used as a [[lubricant]], and a [[diamond]]-like one used as an abrasive.
* [[ferrite (magnet)|Ferrite]] ([[iron|Fe]]<sub>3</sub>O<sub>4</sub>), which is [[ferrimagnetism|ferrimagnetic]] and is used in the [[magnetic core]]s of electrical [[transformer]]s and [[magnetic core memory]].
* [[Lead zirconate titanate]] (PZT) was developed at the [[United States]] [[National Institute of Standards and Technology|National Bureau of Standards]] in 1954. PZT is used as an [[ultrasonic]] [[transducer]], as its piezoelectric properties greatly exceed those of Rochelle salt.<ref>John B. Wachtman, Jr., ed., ''Ceramic Innovations in the 20th Century'', The American Ceramic Society, 1999, ISBN 978-1-57498-093-6.</ref>
* [[Magnesium diboride]] ([[magnesium|Mg]]B<sub>2</sub>), which is an [[unconventional superconductor]].
* [[Porcelain]], which is used for a wide range of products.
* [[Sialons]] / [[Silicon Aluminium Oxynitride]]s, high strength, high thermal shock / chemical / wear resistance, low density ceramics used in non-ferrous molten metal handling, weld pins and the chemical industry.
* [[Silicon carbide]] ([[silicon|Si]]C), which is used as a [[susceptor]] in microwave furnaces, a commonly used abrasive, and as a [[refraction (metallurgy)|refractory]] material.
* [[Silicon nitride]] (Si<sub>3</sub>[[nitrogen|N]]<sub>4</sub>), which is used as an [[abrasive]] powder.
* Steatite (magnesium silicates) is used as an [[electrical insulator]].
* [[Titanium Carbide]] Used in space shuttle re-entry shields and scratchproof watches.
* [[Uranium oxide]] ([[uranium|U]]O<sub>2</sub>), used as [[nuclear fuel|fuel]] in [[nuclear reactor]]s.
* [[Yttrium barium copper oxide]] (Y[[barium|Ba]]<sub>2</sub>[[copper|Cu]]<sub>3</sub>[[oxygen|O]]<sub>7-x</sub>), another high temperature [[Superconductivity|superconductor]].
* [[Zinc oxide]] ([[zinc|Zn]]O), which is a [[semiconductor]], and used in the construction of [[varistor]]s.
* [[Zirconium dioxide]] (zirconia), which in pure form undergoes many [[phase change]]s between room temperature and practical [[sintering]] temperatures, can be chemically "stabilized" in several different forms. Its high oxygen [[ion conductivity]] recommends it for use in [[fuel cell]]s. In another variant, [[metastable]] structures can impart [http://en.wikipedia.org/wiki/Fracture_toughness transformation toughening] for mechanical applications; most [[ceramic knife]] blades are made of this material.
* Partially stabilised zirconia (PSZ) is much less brittle than other ceramics and is used for metal forming tools, valves and liners, abrasive slurries, kitchen knives and bearings subject to severe abrasion. PSZ was developed [http://www.nature.com/nature/journal/v258/n5537/abs/258703a0.html] by Garvie, Hannink, Pascoe and Nicholson of C.S.I.R.O. in Australia and was first manufactured on a laboratory scale by Harold Kanost, an American ceramics engineer working in the same laboratory.

== See also ==

* [[Ceramic]]
* [[Ceramic art]]
* [[Ceramic engineering]]
* [[Ceramics processing]]
* [[Colloid]]
* [[Colloidal crystal]]
* [[Nanotechnology]]
* [[Nanomaterials]]
* [[Nanoparticle]]
* [[Photonic crystal]]
* [[Sol-gel]]
* [[Thin-film optics]]
* [[Transparent materials]]

==References==

{{reflist|2}}

==Further reading==
* Greskovich, G., et al., ( General Electric R & D ), ''Polycrystalline Ceramic Lasers'', J. Appl. Phys., Vol. 44, p. 4599 (1973)

* Yoldas, B.E. ( Westinghouse R & D ), ''Monolithic Glass Formation by Chemical Polymerization'', J. Mater. Sci., Vol.10, p.1856 ( 1975 ), ''Deposition and Properties of Optical Oxide Coatings from Polymerized Solutions'', Applied Optics, Vol. 21, p.2960 ( 1982 ), ''An Aqueous Sol–Gel Route to Prepare Transparent Hybrid Materials'', J. Mater. Chem., Vol. 17, p.4430 ( 2007 )
* Ikesue, A., et al., ''Fabrication and Optical Properties of High Performance Polycrystalline Ceramics of Solid State Lasers'', J. Am. Ceram. Soc, Vol. 78, p. 1033 (1995), ''Polycrystalline Lasers'', Optical Materials, Vol. 19, p.183 (2002)

* Tachiwaki, T., et al., ''Novel Synthesis of YAG leading to Transparent Ceramics'', Solid State Communications, Vol. 119, p. 603 (2001)

* Rabinovitch, Y., et al., ''Transparent Polycrystalline Neodymium-Doped YAG'', Optical Materials, Vol.24, p.345 (2003)

* Wen, L.,et al., ''Synthesis of Nanocrystalline Yttria Powder and Fabrication of Transparent YAG Ceramics'', J. European Ceramic Soc., Vol. 24, p. 2681, (2004)

* Pradhan, A.K., et al., ''Synthesis of Neodymium-doped YAG Nanocrystlalline Powders Leading to Transparent Ceramics'', Materials Research Bulletin, Vol. 39, p. 1291 (2004)
* Jiang, H., et al., ''Transparent Electro-Optic Ceramics and Devices'', Proc. SPIE, Vol. 5644, p.380 (2005), www.bostonati.com/whitepapers/SPIE04paper.pdf

* Huie, J.C. and Gentilman, R., ''Characterization of Transparent Polycrystalline YAG Fabricated from Nanopowders'', Window and Dome Technologies and Materials IX, Proc. SPIE, Vol. 5786, p.251 (2005)

* Barnakov, Yu. A., et al., ''Simple Route to Nd:YAG Transparent Ceramics'', Materials Research Bulletin, Vol. 35, p. 238 (2006)

* Barnakov, Y.A., et al., ''The Progress Towards Transparent Ceramics Fabrication'', Proc. SPIE, Vol. 6552, p.111 (2007)

* Yamashita, I., et al., ''Transparent Ceramics'', J. Am. Ceram. Soc., Vol. 91, p.813 (2008)

* M.W. Barsoum, ''Fundamentals of Ceramics'', McGraw-Hill Co., Inc., 1997, ISBN 978-0070055216.
*{{cite book
| last = Green
| first = D.J.
| coauthors = Hannink, R.; Swain, M.V.
| year = 1989
| title = Transformation Toughening of Ceramics
| location = Boca Raton
| publisher = CRC Press
| isbn = 0-8493-6594-5
}}
* W.D. Kingery, H.K. Bowen and D.R. Uhlmann, ''Introduction to Ceramics'', John Wiley & Sons, Inc., 1976, ISBN 0-471-47860-1.
* M.N. Rahaman, ''Ceramic Processing and Sintering'', 2<sup>nd</sup> Ed., Marcel Dekker Inc., 2003, ISBN 0-8247-0988-8.
* J.S. Reed, ''Introduction to the Principles of Ceramic Processing'', John Wiley & Sons, Inc., 1988, ISBN 0-471-84554-X.
* D.W. Richerson, ''Modern Ceramic Engineering'', 2<sup>nd</sup> Ed., Marcel Dekker Inc., 1992, ISBN 0-8247-8634-3.
* Onoda,G.Y., Hench, L.L. Eds., ''Ceramic Processing Before Firing'', Wiley & Sons, New York (1979)

*{{cite book
|last = Wachtman
|first = John B.
|year = 1996
|title = Mechanical Properties of Ceramics
|publisher = Wiley-Interscience, John Wiley & Son's
|location = New York
|isbn = 0-471-13316-7
}}

==External links==
*http://arxiv.org/ftp/cond-mat/papers/0604/0604531.pdf
*[http://www.azom.com/details.asp?ArticleID=2123 Advanced Ceramics] – The Evolution, Classification, Properties, Production, Firing, Finishing and Design of Advanced Ceramics
*[http://www.madehow.com/Volume-4/Pottery.html How pottery is made]
*[http://www.madehow.com/Volume-5/Toilet.html How sanitaryware is made]
*[http://matse1.mse.uiuc.edu/ceramics/ceramics.html Introduction, Scientific Principles, Properties and Processing of Ceramics]
*[http://www.ceramics.org The American Ceramic Society] The American Ceramic Society
*[http://www.ceram.com CERAM Research Ltd] (Formerly The British Ceramic Research Association)
*[http://www.ceramics-directory.com/index.php Worldwide Ceramics Directory]

[[Category:Dielectrics]]
[[Category:Applied sciences]]
[[Category:Materials]]
[[Category:Ceramic materials]]
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