High-pressure optical study of HfW2O8
Abbreviated Journal Title
J. Phys.-Condes. Matter
NEGATIVE THERMAL-EXPANSION; ZRW2O8; Physics, Condensed Matter
A high-pressure optical absorption study and Raman and infrared spectroscopy are carried out on hafnium tungstate (HfW2O8) at room temperature. The band gap decreases rapidly with pressure until similar to9 GPa is reached, increases between 9 and 16 GPa, and slowly decreases with pressure from 16 to 47 GPa. The changes under pressure of the vibrational modes have been studied, and an estimate of the thermal expansion coefficient has been calculated,and found to be in reasonable agreement with the measured value. The alpha-gamma phase transition can be observed via Raman and infrared spectroscopy. Around 2 GPa, HfW2O8 undergoes an irreversible transition from the gamma-phase to an amorphous structure.
Journal of Physics-Condensed Matter
"High-pressure optical study of HfW2O8" (2002). Faculty Bibliography 2000s. 3116.