Fig. 141: Integrated spectra of rhombohedral boron nitride (r-BN). (a) r-BN and the pressure medium at 5 GPa and 573 K, (b) only the pressure medium close to the sample, (c) final spectrum of the sample after subtraction of the sample environment. The images were collected in 30 seconds using 51.2 keV radiation and no focusing.

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