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Melting of Copper, Silver, and Gold at High Pressures.

机译：高压下铜，银和金的熔化。

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The melting points of copper, silver, and gold have been determined up to about 40 kbar by means of differential thermal analysis in piston-cylinder apparatus. The melting curve of gold shows definite curvature in the explored pressure range, and slight curvature is suggested for copper; the melting temperature of silver rises linearly with pressure. The experimentally determined initial slopes, without any corrections attempted for the effects of pressure on thermocouple emf, are (in degrees/kbar): Cu, about 3.9 (sub 5); Ag, 5.87 plus or minus 0.27; Au, about 6.1 (sub 2). Comparison of initial melting slopes with those predicted from thermodynamic data allows evaluation of proposed pressure corrections to emf of Pt versus Pt+10%Rh thermocouples; those proposed by Hanneman and Strong (J. Appl. Phys. 36:523 (1965)) are shown to be too large. The linearity of the melting curve of silver, combined with its ease of containment, suggests its use for high-pressure, high-temperature calibration. Bounds for the initial variations in the volume changes of fusion with pressure may be estimated from the present results and zero-pressure data. The Lindemann relation for melting is examined for copper, silver, and gold by comparing the present results for melting with the 300 degrees K data for the elastic moduli and their variation with pressure; agreement does not appear to be adequate. (Author)

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