Abstract
Raman spectra of isotopically pure CuCl samples and were measured under hydrostatic pressure up to 14 GPa at low temperature Up to six Raman modes were resolved for the binary BC8-analog phase CuCl-IV in the range from 4.1 to 14 GPa. The phonon dispersion relations of this phase were calculated within a rigid ion model. Based on this calculation an assignment for the observed Raman-active modes is proposed. The calculated pressure dependences of mode frequencies reproduce the experimental results. Raman spectra support the existence of the phase CuCl-IIa in a narrow pressure range from 3.3 to 4.1 GPa.
- Received 5 May 1999
DOI:https://doi.org/10.1103/PhysRevB.60.9410
©1999 American Physical Society