Pressure effect on the melting point of alkali metals |
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Authors: | T Soma H-Matsuo Kagaya J Satoh |
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Institution: | Department of Applied Physics and Mathematics, Mining College, Akita University, Akita 010, Japan |
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Abstract: | The mean-square displacement of alkali metals is studied theoretically using our local Heine-Abarenkov-type model potential in the perturbational scheme. The temperature-dependent mean-square displacement of alkali metals decreases as function of the compressed volume. Lindemann's criterion for melting xm, which is defined as the ratio of two times the root-mean-square displacement to the nearest-neighbour distance, is found to be nearly constant for five alkali metals. The volume effect on the melting temperature of alkali metals is studied by keeping xm constant. The obtained melting curve increases as function of the compressed volume and are qualitatively in good agreement with the observed tendency for alkali metals. |
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