Abstract
Anomalies in the heat capacity curves of AgI have been detected near the temperature of 150 K. Powder X-ray diffraction experiments have been performed in the temperature range 23–299 K. These anomalies were observed for the specimens which experienced the α- to β/γ-phase transition (heated up to 773 K and then quenched to room temperature) but became unobservable in the subsequent heating cycles. The various values (1.5, 13.0 and 4.1 Jmol −1) of the enthalpy of transition obtained depend on the thermal history. It can be considered that the anomaly is a transformation from the intermediate (high-pressure) phase to the β/γ phase.
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