Abstract
Non-isothermal crystallization kinetics in conventionally melt quenched versus mechanochemically synthesized amorphous AgI–Ag 2O–CrO 3 superionic solids is discussed. The quenched as well as ball-milled samples exhibit glass ( T g) and multiple amorphous⇒crystalline ( T c) transitions. T g as well as T c are found to increase monotonically with heating rate. The activation energy for structural relaxation ( E s) obtained using Moynihan equation is found to be higher for ball-milled samples that eventually suggests the relatively rigid and highly viscous structure of milled samples. The activation energy associated with nucleation and growth ( E c) is obtained using Matusita–Sakka equation and its higher value confirms the higher rate of crystallization in ball-milled samples. The values of T c– T g and the enthalpy of phase transformation (ΔH) are also found higher for the ball-milled samples that confirm their comparatively high thermal stability. The electrical conductivity near the crystallization temperatures is studied as a function of time and temperature and these results confirm the presence of amorphous⇒crystalline transition temperatures in the ball-milled as well as in the melt-quenched samples.
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