Phase transformation in disordered systems

Lindemann criterion of melting has been extended to compute liquidus temperatures of some simple binary K-Cs, K-Rb and Rb-Cs systems. Obtained phase diagrams in turn have been used to investigate the relative glass forming ability in terms of empirical parameter in the entire range of composition. The results suggest that out of these three systems only K-Cs system has glass forming tendency. However glass formation is not favoured in other two systems. Further analysis of heat capacity data of K-Cs system at equiatomic composition at different temperatures gives a singularity point T=154.8K, identified as glass transition temperature. The obtained results in all binary systems are compared with available experimental results and a good agreement is observed. (author)