Phase diagrams of calcium and strontium at high pressures

Jayaraman, A. ; Klement Jr, W. ; Kennedy, G. C. (1963) Phase diagrams of calcium and strontium at high pressures Physical Review, 132 (4). pp. 1620-1624. ISSN 0031-899X

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The melting temperatures for both Ca and Sr increase rapidly with pressure, reaching nearly 1200°C at 40 kbar. The only solid-solid transition in Ca below 35 kbar is that between the body-centered cubic and face-centered cubic polymorphs; the slope of the phase boundary is about 3.3°C/kbar. The phase boundary between the homologous Sr polymorphs has an initial slope of about -10°C/kbar becoming much steeper at higher pressures. Also, the hysteresis associated with the transition is a function of pressure and becomes very large above 22 kbar. The face-centered cubic Sr shows a large increase in resistance with pressure and a negative temperature coefficient of resistance prior to the polymorphic transition. The resistance discontinuity for the fcc-bcc transformation is a sharp increase at lower pressures, which progressively decreases in magnitude and sharpness and reverses sign at the higher pressures.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:13367
Deposited On:11 Nov 2010 08:31
Last Modified:06 Jun 2011 05:52

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