Abstract
The process of La2Hf2O7 (rLa3+/rHf4+ = 1.63) nanocrystals formation and evolution upon calcinations up to 1400 °C has been investigated by means of synchrotron radiation X-ray diffraction (XRD) and Raman spectroscopy. It has been shown that isothermal calcination at 800 °C/3h of the X-ray amorphous precursor firstly leads to the formation of oxide nanocrystalline powders with a defect fluorite structure. In the temperature range 900 - 1000 °C we observed the nucleation and growth of pyrochlore nanodomains inside a well crystalline fluorite matrix. The pyrochlore-type superstructural ordering of cations and anions appears at calcinations temperature higher than 1000 °C.
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CITATION STYLE
Popov, V. V., Menushenkov, A. P., Yastrebtsev, A. A., & Zubavichus, Y. V. (2016). La2Hf2O7 crystal and local structure changes on the fluorite - Pyrochlore phase transition. In Journal of Physics: Conference Series (Vol. 747). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/747/1/012043
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