A pressure-induced phase transition of CsBr was found by using energy dispersive x-ray diffraction with a synchrotron x-ray source. The cubic phase CsBr was found to undergo transformation to a tetragonal crystal structure under high pressure similar to that recently reported for CsI. We suggest again that macroscopic elastic instability theory provides a possible explanation of this kind of phase transition.

• Received 29 June 1984

DOI:https://doi.org/10.1103/PhysRevB.30.2968