Pressure-induced structural transition in Ln2Zr2O7 (Ln = Ce, Nd, Gd) pyrochlores
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- Surblé, S., Heathman, S., Raison, P.E. et al. Phys Chem Minerals (2010) 37: 761. doi:10.1007/s00269-010-0374-3
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The structural behavior 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 on a pressure value that increases with the ionic radius of the lanthanide ions, rLn. The cubic and monoclinic phases coexist over a wide pressure range which increases with rLn. 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.