Pressure-induced structural transition in lanthanide pyrochlore zirconates
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.
SURBLE Suzy;
HEATHMAN Stephen;
RAISON Philippe;
BOUEXIERE Daniel;
POPA Karin;
CACIUFFO Roberto;
2011-01-11
SPRINGER
JRC55900
0342-1791,
http://www.springerlink.com/content/0342-1791/37/10/,
https://publications.jrc.ec.europa.eu/repository/handle/JRC55900,
10.1007/s00269-010-0374-3,
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