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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 46,
  • Issue 10,
  • pp. 1495-1497
  • (1992)

Compressibilities of TbVO4 and DyVO4 Calculated from Spectroscopic Data

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Abstract

The compressibilities of TbVO<sub>4</sub> and DyVO<sub>4</sub> were estimated indirectly from the pressure dependence of the Raman stretching frequencies of the vanadium-oxygen (V-O) bonds, <i>v</i><sub>1</sub>(<i>A</i><sub>g</sub>), through an empirical correlation between <i>v</i><sub>1</sub>(<i>A</i><sub>g</sub>) and the corresponding bond lengths. Volume compressibilities of 6.71 × 10<sup>−3</sup> GPa<sup>−1</sup> (bulk modulus 149 GPa) and 6.23 × 10<sup>−3</sup> GPa<sup>−1</sup> (bulk modulus 160 GPa) were derived for TbVO<sub>4</sub> and DyVO<sub>4</sub>, respectively. This approach provides a straightforward method to estimate the compressibility and equation of state (EOS) of crystals via Raman spectroscopic measurements.

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