Pressure Dependence of the Alpha-Beta Transition Temperature in Silver Selenide.
The pressure dependence of the alpha-beta transition temperature in Ag(2)Se was determined by observing the temperature at which the sharp change in resistivity occurs when Ag(2)Se is transformed from the low-temperature orthorhombic to the high temperature body-centered-cubic form. The transition temperature increased from 133 degrees C at 1 atmosphere to 298 degrees C at 47 kilobars. The value of DeltaH(t), 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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