PRESSURE-INDUCED TRANSFORMATIONS IN GLASSES

The double-well potential model, well known to describe many low-tempe rature properties of amorphous materials, has been extended to incorpo rate effects of high pressures. The resulting model not only explains the temperature and time dependences of pressure-induced phenomena but also provides possible explanations for thermal annealing effects as well as irradiation compaction. The results of Brillouin-light-scatter ing experiments designed to test various predictions of the model are presented: good agreement is obtained.