Vanadium oxide: Difference between revisions
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* Phases with the general formula V<sub>n</sub>O<sub>2n+1</sub> exist between V<sub>2</sub>O<sub>5</sub> and VO<sub>2</sub>. Examples of these phases include V<sub>3</sub>O<sub>7</sub>, V<sub>4</sub>O<sub>9</sub> and V<sub>6</sub>O<sub>13</sub>.<ref name = "Wells">{{Wells5th}}</ref> |
* Phases with the general formula V<sub>n</sub>O<sub>2n+1</sub> exist between V<sub>2</sub>O<sub>5</sub> and VO<sub>2</sub>. Examples of these phases include V<sub>3</sub>O<sub>7</sub>, V<sub>4</sub>O<sub>9</sub> and V<sub>6</sub>O<sub>13</sub>.<ref name = "Wells">{{Wells5th}}</ref> |
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* Phases with the general formula V<sub>n</sub>O<sub>2n−1</sub> exist between VO<sub>2</sub> and V<sub>2</sub>O<sub>3</sub>.<ref name = "Wells"/> Called '''Magnéli phases''' for [http://www.iucr.org/iucr-top/people/magneli.htm Arne Magnéli]<ref name ="Greenwood">{{Greenwood&Earnshaw}}</ref> |
* Phases with the general formula V<sub>n</sub>O<sub>2n−1</sub> exist between VO<sub>2</sub> and V<sub>2</sub>O<sub>3</sub>.<ref name = "Wells"/> Called '''Magnéli phases''' for [http://www.iucr.org/iucr-top/people/magneli.htm Arne Magnéli],<ref name ="Greenwood">{{Greenwood&Earnshaw}}</ref> they are examples of [[crystallographic shear]] compounds based on the [[rutile]] [[crystal structure|structure]].<ref name = "Wells"/> Examples of Magnéli phases include V<sub>4</sub>O<sub>7</sub>, V<sub>5</sub>O<sub>9</sub>, V<sub>6</sub>O<sub>11</sub>, V<sub>7</sub>O<sub>13</sub> and V<sub>8</sub>O<sub>15</sub>. |
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Many vanadium-oxygen phases are [[non-stoichiometric compound|non-stoichiometric]].<ref name ="Greenwood"/> |
Many vanadium-oxygen phases are [[non-stoichiometric compound|non-stoichiometric]].<ref name ="Greenwood"/> |
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Revision as of 11:09, 11 December 2012
Vanadium oxide may refer to:
- Vanadium(II) oxide (vanadium monoxide), VO
- Vanadium(III) oxide (vanadium sesquioxide or trioxide), V2O3
- Vanadium(IV) oxide (vanadium dioxide), VO2
- Vanadium(V) oxide (vanadium pentoxide), V2O5
In addition to these principal oxides of vanadium, various other distinct phases exist:
- Phases with the general formula VnO2n+1 exist between V2O5 and VO2. Examples of these phases include V3O7, V4O9 and V6O13.[1]
- Phases with the general formula VnO2n−1 exist between VO2 and V2O3.[1] Called Magnéli phases for Arne Magnéli,[2] they are examples of crystallographic shear compounds based on the rutile structure.[1] Examples of Magnéli phases include V4O7, V5O9, V6O11, V7O13 and V8O15.
Many vanadium-oxygen phases are non-stoichiometric.[2]
References
- ^ a b c Wells, A. F. (1984), Structural Inorganic Chemistry (5th ed.), Oxford: Clarendon Press, ISBN 0-19-855370-6
- ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
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