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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1033-1034Pressure-Induced Cationic Disordering in...

Pressure-Induced Cationic Disordering in Pyrochlore Oxides (La_1-xCe_x)₂Zr₂O₇ and Enhancement of Compressibility

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Abstract:

Pyrochlore oxides La₂Zr₂O_7, Ce₂Zr₂O₇ and their solid solutions were studied by in situ x-ray diffraction (XRD) measurement at high pressures. Pressure dependence of cationic disordering was derived from Rietveld refinement of the XRD patterns. The results indicated that the mixed occupancy in the cation site enhanced the compressibility obviously. All the pyrochlore structure became unstable at ~20 GPa and an orthorhombic high-pressure phase formed. The cations changed from the ordered state in pyrochlore to a disordered state in the high-pressure phase. The high-pressure phase is about 8% denser than the pyrochlore phase and not stable at ambient conditions and a disordered defect-fluorite structure was quenched for all the samples.

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Advances in Chemical Engineering and Advanced Materials IV

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Periodical:

Advanced Materials Research (Volumes 1033-1034)

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583-587

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https://doi.org/10.4028/www.scientific.net/AMR.1033-1034.583

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Online since:

October 2014

Authors:

Fu Xiang Zhang*, Maik Lang

Keywords:

Order-Disorder Transition, Pressure, Pyrochlore Oxides

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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