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The pressure-amorphized state in zirconium tungstate: a precursor to decomposition

Arora, Akhilesh K. and Sastry, V. S. and Sahu, P. Ch. and Mary, T. A. (2004) The pressure-amorphized state in zirconium tungstate: a precursor to decomposition. Journal of Physics: Condensed Matter, 16 (7). pp. 1025-1031. ISSN 0953-8984.

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In contrast to widely accepted view that pressure-induced amorphization arises due to kinetic hindrance of equilibrium phase transitions, here we provide evidence that the metastable pressure-amorphized state in zirconium tungstate is a precursor to decomposition of the compound into a mixture of simple oxides. This is from the volume collapse ΔV across amorphization, which is obtained for the first time by measuring linear dimensions of irreversibly amorphized samples during their recovery to the original cubic phase upon isochronal annealing up to 1000 K. The anomalously large ΔV of 25.7 ± 1.2% being the same as that expected for the decomposition indicates that this amorphous state is probably a precursor to kinetically hindered decomposition. A P–T diagram of the compound is also proposed.

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Additional Information:© 2004 IOP Publishing Ltd. Received 12 August 2003, in final form 6 January 2004. Published 6 February 2004. Print publication: Issue 7 (25 February 2004). It is a pleasure to acknowledge Professor Takehiko Yagi for stimulating discussions. We thank Dr T R Ravindran and Dr T Sakuntala for help in recording the Raman spectra, Dr B Viswanathan for keen interest in the work, Dr Baldev Raj for support and Mr S B Bhoje for encouragement.
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Deposited On:08 Jun 2005
Last Modified:26 Dec 2012 08:39

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