On the crystal structure and properties of Ca2Nb2O7, “calcium pyroniobate”
- 1 January 1970
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 21 (169), 189-194
- https://doi.org/10.1080/14786437008238406
Abstract
Preliminary results for Ca2Nb2O7 indicate a new type of structure for an A2B2O7 compound containing BO6 octahedra. This structure, which is distinct from the pyrochlore and weberite types, contains parallel slabs each having a distorted perovskite configuration, but arranged with a notable lack of Nb–O–Nb links between successive slabs. A comparison is made with the structures of NaNbO2F2 and certain ferroelectric ABF4 compounds. The absence of ferroelectricity in Ca2Nb2O7 is discussed.Keywords
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