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Local crystal chemistry, structured diffuse scattering and the dielectric properties of (Bi1−xYx)2(MIIINbV)O7 (M=Fe3+, In3+) Bi-pyrochlores by W. Somphon; V. Ting; Y. Liu; R.L. Withers; Q. Zhou; B.J. Kennedy is a Materials Science article available to read on EtoBox.

What is Local crystal chemistry, structured diffuse scattering and the dielectric properties of (Bi1−xYx)2(MIIINbV)O7 (M=Fe3+, In3+) Bi-pyrochlores about?

Electron diffraction is used to investigate the large amplitude displacive disorder characteristic of the Bi2(M IIINbV)O7 Bi-pyrochlores, Bi2InNbO7 and Bi2FeNbO7, as well as of their A site substituted Bi1.5Y0.5InNbO7 and Bi1.5Y0.5FeNbO7 variants. Highly structured diffuse distributions in the form of {110}\* sheets of diffuse intensity perpendicular to the six 〈110〉 directions of real space along with 〈111〉\* rods of diffuse intensity perpendicular to the four {111} real space planes are observed. The existence of this structured diffuse scattering is interpreted in terms of large amplitude, β-cristobalite-type tetrahedral rotations of the O′A 2 tetrahedral framework sub-structure of the ideal pyrochlore structure type. Bond valence sum calculations are used to understand the local crystal chemistry responsible for such displacive disorder. The frequency-dependent dielectric properties of Bi2InNbO7 and Bi2FeNbO7 are also investigated along with the effect upon them of A site doping with Y.

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Author

W. Somphon; V. Ting; Y. Liu; R.L. Withers; Q. Zhou; B.J. Kennedy

Publisher

Elsevier BV

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)