Abstract

Eleven members of the series Tb2Sn2-xZrxO7 were synthesized and characterized by a combination of Synchrotron X-ray diffraction and Raman spectroscopy. S-XRD shows that Tb2Sn2O7 has a pyrochlore structure, and Tb0.5Zr0.5O2-x has a defect fluorite structure. Both techniques demonstrate that the addition of Zr4+, which reduces the ratio of the average size of the two cation sites destabilises the pyrochlore. The pyrochlore and fluorite phases are observed to co-exist at intermediate compositions 1.6≤x≤0.8.

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