DIFFERENTIAL SCANNING CALORIMETRIC STUDIES OF SEVERAL COMPOUNDS SHOWING ORDER-DISORDER TRANSITION

Differential scanning calorimetric measurements have been carried out for CuI, CuBr, AgI, Ag//2S, NaNO//2, NaNO//3 and KSCN. First-order phase transformations occur with the compounds CuI, CuBr, AgI and Ag//2S; NaNO//2, NaNO//3 and KSCN exhibit lambda -type transformations. The enthalpy changes due to phase transitions have been determined. Thermal hysteresis exhibited by these compounds have been examined in the light of their change in unit cell volumes.