Abstract
The optical properties of the moissanite (single-crystal 6H-SiC) and its performance as anvil material for high-pressure infrared spectroscopic measurements have been examined. Tests were carried out to 53 GPa using moissanite anvil cells combined with synchrotron radiation and globar as infrared sources. In the region of characteristic phonon absorption of diamond (1900–2300 cm−1), the transmitted signal measured through 4 mm of moissanite single crystals is 5–10 times higher than that obtained with type-II diamond anvils. No significant change of the transmission spectra through the moissanite anvils was observed over the pressure range studied; however, we also present mid infrared absorption spectra of powdered SiC to 43 GPa.
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