Raman Spectroscopic Investigation of H3[Co(CN)6]: An Anharmonicity Study

To investigate the anharmonicity of different phonons in the negative thermal expansion material H-3[Co(CN)(6)], temperature dependent Raman spectroscopic studies have been carried out in the temperature range 80-300 K. No discontinuous or slope changes of mode frequencies are observed with temperature implying that H-3[Co(CN)(6)] is stable in the entire temperature range. The temperature dependence of mode frequencies and their linewidths (FWHMs) are analyzed using the anharmonicity models, which indicate that the three-phonon decay process is dominant over the four-phonon process.