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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