英文摘要
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We have carried out lattice dynamics calculation of the phonon spectra to understand the anomalous thermal-expansion behavior in ZrV2O7, ZrP2O7 and Sc2(MoO4)3. Our calculations show that thermal-expansion behavior of these compounds is mainly governed by the nature of vibration of low-energy translational and rotational modes up to about 10 meV. The calculations are able to explain the large difference in thermal-expansion behavior of these compounds.
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