Abstract
Using diamond anvil cell (DAC) technique, in situ high‐pressure Raman scattering and energy‐dispersive X‐ray diffraction (EDXRD) experiments were used at room temperature to study 3C‐SiC with an average grain size of 30 nm. In contrast to its bulk counterpart, a decrease of the Born's transverse effective charge of these nanocrystals was observed with increasing pressure from measurements of the longitudinal and transverse optical phonon modes (longitudinal optical–transverse optical) splitting. This is therefore indicative of a diminishing ionicity of nanocrystalline 3C‐SiC on compression.
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