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from various experiments and theories for certain halides of monovalent metals, allinclusive linear relationship has been fashioned out. This expression holds between the change in entropy and volume on melting; it is approximately obeyed by the majority of halides considered and leads to a deficit of entropy on melting for a number of samples. The observed anomalies found explanation in the structural and transport phenomena.
The deviating systems e.g. Ag-I belongs to the group of fast-ion conductors in the high temperature crystal phase.