High-pressure behavior of quasi-one-dimensional 2H-CsCdBr3

Abstract
Hexagonal 2H-CsCdBr3 has a strongly anisotropic bonding scheme: ionicovalent CdBr6 chains are separated by cesium ions. Analysis of the Raman-active modes up to 25 GPa shows no phase transition. The behavior of the modes is similar to that of other one-dimensional crystals, although mechanical properties (compressibility) show little anisotropy. A qualitative model is proposed to evaluate the variation of interatomic distances under pressure.