DIFFUSE SCATTERING IN PYROCHLORES

Diffuse Scattering in the Cesium Pyrochlore CsTi0.5W1.5O6
G J Thorogood, P J Saines, B J Kennedy, R L Withers and M M Elcombe
Mater Res Bull 43, 787-795 (2008)

The structure of the defect pyrochlore CsTi0.5W1.5O6 has been investigated using electron, synchrotron X-ray and neutron diffraction methods. The material is cubic a = 10.2773 Å with displacive disorder of the Cs cations along the 〈1 1 1〉 direction. The local structure, revealed by the diffuse structure in the electron diffraction patterns shows there is correlated displacement of the heavy Cs atoms along the 〈1 1 0〉 directions. The thermal expansion of the material is also described.

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