Abstract
High-pressure single crystal X-ray diffraction experiments and FT-IR observations of natural chondrodite, synthesized OH-chondrodite and phase A have been conducted. FT-IR observations of natural chondrodite showed that the peaks shifted to lower wave-numbers with increasing pressure. This suggested that hydrogen bonding would be formed in its structure under highpressure conditions.As results from X-ray diffraction experiments under high-pressure conditions, bulk moduli of these minerals were determined and their crystal structures were refined. The relationships between bulk modulus and packing index and summation of the filling factor for humite minerals and some DHMS phases were plotted on a simple positive line, respectively. Also, as results from structural refinements under high-pressure conditions, the polyhedral bulk moduli were obtained. Compression mechanism of humite minerals was controlled by the octahedral compression mainly.
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