High-pressure Raman and infrared study of ZrV_2O_7

摘要

The room-temperature Raman and infrared spectra of zirconium vanadate (ZrV_2O_7) were observed up to pressures of 12 GPa and 5.7 GPa, respectively. The frequencies of the optically active modes at ambient pressure were calculated using direct methods and compared with experimental values. Average mode Griineisen parameters were calculated for the Raman and infrared active modes. Changes in the spectra under pressure indicate a phase transition at ～ 1.6 GPa, which is consistent with the previously observed a (cubic) to β (pseudo-tetragonal) phase transition, and changes in the spectra at ～4 GPa are consistent with an irreversible transformation to an amorphous structure.