Pressure-induced disordering and anomalous lattice expansion in La2Zr2O7 pyrochlore.
Pressure-induced cation and anion disordering in La2Zr2O7 pyrochlore is quantitatively analyzed by Rietveld refinement of in situ x-ray diffraction patterns, Raman, and infrared measurements. An anomalous lattice expansion and obvious change of the pressure dependence of the vibrational modes occur at ∼10  GPa. The pressure-induced water incorporation in the La2Zr2O7 pyrochlore structure may be related to a previously noted photoelectrochemical effect.
Zhang
F X
FX
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA.
Lang
M
M
Liu
Zhenxian
Z
Ewing
R C
RC