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The effect of pressure to 300 kbar has been measured on the volume and on the lattice parameters (c and a) of the hcp magnesium lattice. The a axis compresses in a regular manner, but the c axis compresses relatively rapidly to 70 kbar, then becomes continuously more incompressible in the range 70-120 kbars, which results in a distinct increase in c/a. The compressibility increases in the region 120-200 kbar and c/a is essentially constant. Beyond 200 kbar the c-axis compressibility decreases again and c/a increases rapidly. These results and earlier measurements of resistance as a function of pressure are interpreted qualitatively in terms of the theories of Jones and Goodenough and the Fermi surface as calculated by Falicov.
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Clendenen et al. (1964) studied this question.
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