High-pressure Raman and infrared study of HfW2O8 -: art. no. 214111

被引：29
作者：
Chen, B [1 ]
Muthu, DVS
Liu, ZX
Sleight, AW
Kruger, MB
机构：
[1] Univ Missouri, Dept Phys, Kansas City, MO 64110 USA
[2] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India
[3] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
[4] Carnegie Inst Sci, Ctr High Pressure Res, Washington, DC 20015 USA
[5] Oregon State Univ, Dept Chem, Corvallis, OR 97331 USA
来源：
PHYSICAL REVIEW B | 2001年 / 64卷 / 21期
关键词：
D O I：
10.1103/PhysRevLett.87.214111
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The high-pressure Raman and infrared spectra of hafnium tungstate (HfW2O8) are measured up to 24 GPa at room temperature. The changes under pressure of the stretching and bending modes of the WO4 tetrahedra. as well as lattice modes have been studied. An estimate of the thermal-expansion coefficient has been made based upon the mode Gruneisen parameters and found to be in reasonable agreement with the measured value. The high-pressure spectra indicate that the alpha-gamma phase transition occurs at 0.6-0.9 GPa. in agreement with previous work. Around 2 GPa. HfW2O8 undergoes an irreversible transition from the gamma phase to an amorphous structure.
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页数：5
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