title: Pressure-induced disordering and anomalous lattice expansion in La2Zr2O7 pyrochlore.
abstract: 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.
authors.affiliation: Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: F X
authors.initials: FX
authors.lastname: Zhang
authors.forename: M
authors.initials: M
authors.lastname: Lang
authors.forename: Zhenxian
authors.initials: Z
authors.lastname: Liu
authors.forename: R C
authors.initials: RC
authors.lastname: Ewing