Raman spectra of cBN at elevated temperatures and pressures acquired with alumina (a), and argon (b), as transmitting media, respectively. Spectra are shifted vertically for clarity. Pressure has been measured at room temperature and was assumed to be temperature independent for the experiment shown in panel (b). Lines for the spectra in panel (b) correspond to phenomenological fits (Voigt profiles) .
(a) cBN in Al2O3
(b) cBN in Ar
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