Abstract
The formation of nanocrystal powders of Ln2Zr2O7 (Ln=La - Tb) compounds upon calcinations up to 1500°C has been investigated by using of X-ray absorption fine structure spectroscopy combined with X-ray powder diffraction and Raman spectroscopy. It was found that the fluorite-pyrochlore phase transition occurs at calcination temperature in the range of 900-1200 °C (except Tb, T~1500 °C). The appearance of the ordered pyrochlore structure at calcination temperatures above 900 °C was fixed as an observation of superlattice peaks in diffraction and splitting of the first oxygen coordination shell in the local lanthanides environment in EXAFS and Raman spectra. In addition the scheme of fluorite-pyrochlore transition temperature dependence on radii of lanthanide cations was constructed.
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