Abstract
To investigate the anharmonicity of different phonons in the negative thermal expansion material H3[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 H3[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.
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