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|Title:||Pressure-induced structural transition in lanthanide pyrochlore zirconates|
|Authors:||SURBLE SUZY; HEATHMAN Stephen; RAISON Philippe; BOUEXIERE Daniel; POPA Karin; CACIUFFO Roberto|
|Citation:||PHYSICS AND CHEMISTRY OF MINERALS vol. 37 no. 10 p. 761 - 767|
|Type:||Articles in periodicals and books|
|Abstract:||The structural behaviour under pressure of three lanthanide pyrochlore zirconates Ln2Zr2O7 (Ln3+ = Ce, Nd and Gd) has been investigated by x-ray diffraction up to 50 GPa. For all three compounds a symmetry reduction from cubic to monoclinic is observed under increasing pressure dependant upon a pressure value that increases with the ionic radius of the lanthanide ions, rA. The cubic and monoclinic phases coexist over a wide pressure range which increases with rA. The zero-pressure bulk modulus of the cubic phase, B0, and its pressure derivative, B0', have been determined by fitting the experimental compressibility curves to the Birch-Murnaghan equation of state.|
|JRC Institute:||Nuclear Safety and Security|
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