High-pressure optical study of HfW2O8

    Authors

    B. Chen; D. V. S. Muthu; Z. X. Liu; A. W. Sleight;M. B. Kruger

    Comments

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    Abbreviated Journal Title

    J. Phys.-Condes. Matter

    Keywords

    NEGATIVE THERMAL-EXPANSION; ZRW2O8; Physics, Condensed Matter

    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 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 Title

    Journal of Physics-Condensed Matter

    Volume

    14

    Issue/Number

    50

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    13911

    Last Page

    13916

    WOS Identifier

    WOS:000185020400021

    ISSN

    0953-8984

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