Abstract
The α-phase of silver iodide, which is thermodynamically stable only above 147 °C, was stabilized at room temperature in the AgI-Ag 2O-B 2O 3 glasses by twin roller rapid quenching of melts. In the α-AgI-stabilized composites, spherical particles of α-AgI (about 30 nm in diameter) were observed to be homogeneously dispersed in a glass matrix. The annealing of the composites up to the temperatures higher than the glass transition temperature of the matrix glass brought about the relaxation of the lattice strain of α-AgI originally generated by the presence of rigid glass matrix and accelerated the α- to β- phase transformation. Much larger lattice strain was observed at low temperatures below −10 °C, at which the activation energy for conduction was steeply changed and the heat capacity was maximized. Such anomalies at around −10 °C was associated with the ordering of Ag + ions in the stabilized α-AgI.
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