Abstract
Pressure-induced structural changes in ${\mathrm{Gd}}_{2}{\mathrm{Zr}}_{2}{\mathrm{O}}_{7}$ pyrochlore have been investigated at pressures up to $43\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ by synchrotron x-ray diffraction and Raman scattering measurements. With increasing pressure, the ordered pyrochlore begins to transform to a disordered defect-fluorite-type (cubic) structure up to $15\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. Above $15\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, a high-pressure (HP) phase forms that has a distorted defect-fluorite-structure of lower symmetry. Upon release of pressure, the HP phase is not stable and gradually transforms back to the cubic defect-fluorite structure.
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