Pressure Dependence of the Alpha-Beta Transition Temperature in Silver Selenide

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Science  12 Feb 1965:
Vol. 147, Issue 3659, pp. 732-733
DOI: 10.1126/science.147.3659.732


The pressure dependence of the α-β transition temperature in Ag2Se was determined by observing the temperature at which the sharp change in resistivity occurs when Ag2Se is transformed from the low-temperature orthorhombic to the high temperature body-centered-cubic form. The transition temperature increased from 133°C at 1 atmosphere to 298°C at 47 kilobars. The value of ΔHt, the heat of transformation, of 2.19 kcal/mol measured calorimetrically agreed well with the value calculated from dT/dP of the transition.

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