High-pressure Raman and infrared study of HfW2O8

Chen, B and Muthu, DVS and Liu, ZX and Sleight, AW and Kruger, MB (2000) High-pressure Raman and infrared study of HfW2O8. In: Physical Review, 64 (21). pp. 361-371.

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Abstract

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.

Item Type:	Journal Article
Publication:	Physical Review
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Keywords:	Negative Thermal-Expansion;Zrw2o8; Phase;Molybdates.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	12 Aug 2009 06:25
Last Modified:	19 Sep 2010 04:54
URI:	http://eprints.iisc.ac.in/id/eprint/17017

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