High-pressure optical study of HfW2O8

Chen, B and Muthu, DVS and Liu, ZX and Sleight, AW and Kruger, MB (2002) High-pressure optical study of HfW2O8. In: Journal of Physics: Condensed Matter, 14 (50). pp. 13911-13916.

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Abstract

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 ~9 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 α– γ phase transition can be observed via Raman and infrared spectroscopy. Around 2 GPa, HfW2O8 undergoes an irreversible transition from the γ-phase to an amorphous structure.

Item Type:	Journal Article
Publication:	Journal of Physics: Condensed Matter
Publisher:	Institute of Physics
Additional Information:	Copyright of this article belongs to Institute of Physics.
Keywords:	NEGATIVE THERMAL-EXPANSION;ZRW2O8.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	12 Aug 2009 06:20
Last Modified:	19 Sep 2010 04:53
URI:	http://eprints.iisc.ac.in/id/eprint/16637

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