SEVERAL investigations of the infra-red spectrum of hydrargillite powder have been reported1–4. However, no study of single crystals as yet seems to have been reported. In the present investigation, thin plates were cut from a single crystal of synthetic hydrargillite (product of Showa Denko Co.) about 3µ thick, some parallel to the (001) plane and some nearly perpendicular to the (001) plane. The absorption spectra were recorded in the region of 4,000 ∼ 450 cm−1. The spectra so obtained were compared with the powder spectra and several points of difference were found.
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Journal of Thermal Analysis and Calorimetry (2014)