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A new three-dimensional incommensurately modulated cubic phase (in ZrP2B7) and its symmetry characterization via temperature- dependent electron diffraction

Withers, R.L.; Tabira, Y.; Evans, J.S.O.; King, I.J.; Sleight, A.W.

Authors

R.L. Withers

Y. Tabira

I.J. King

A.W. Sleight



Abstract

A detailed electron diffraction study has been made of the ZrP2O7 member of the AM(2)O(7) family of framework structures and of its temperature-dependent structural phase transformations. The room-temperature phase corresponds to a primitive 3 x 3 x 3 superstructure phase of probable space group symmetry Pa3. An observed glide extinction condition when viewed down < 001 > ages could, however, also be compatible with resultant Pbca space group symmetry. The high-temperature phase corresponds to the normal unmodulated parent structure. An intervening intermediate phase that exists over a relatively narrow temperature window (similar to 5-10 degreesC) around 294 degreesC is shown to be a three-dimensional incommensurately modulated cubic phase characterized by incommensurate primary modulation wave vectors in the close vicinity of 0.31 < 100 >* and probable superspace group symmetry P: Pa (3) over bar: Ia (3) over bar. (C) 2001 Academic Press.

Citation

Withers, R., Tabira, Y., Evans, J., King, I., & Sleight, A. (2001). A new three-dimensional incommensurately modulated cubic phase (in ZrP2B7) and its symmetry characterization via temperature- dependent electron diffraction. Journal of Solid State Chemistry, 157(1), 186-192

Journal Article Type Article
Publication Date 2001-02
Journal Journal of Solid State Chemistry
Print ISSN 0022-4596
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 157
Issue 1
Pages 186-192
Publisher URL <Go to ISI>://000167634500025