The contemporary status of experimental as well as theoretical advances within the special view of structural phase transitions is reviewed. A brief outline of phase transitions and its classification is presented first. High-pressure experimental techniques developed for studying the structural phase transitions and elastic properties are reviewed. The complete set of theoretical and experimental data obtained is for the group II–IV alkaline earth chalcogenides. Here the authors review the currently used calculations and high-pressure behavior of these materials and the theoretical work that has been done on them.
 S.L. Chaplot, S.K. Sikka, In: A.K. Singh (Ed.), Recent trends in high pressure research, Proc. of the XIII AIRAPT conference on high pressure science and technology (IBH, New Delhi, Oxford, 1992) 259