Identification of a low-energy OH-valence vibration in zoisite
نویسنده
چکیده
By using the H-D isotope eflect on the vibrational spectrum of orthorhombic zoisite, we conflrm the assignrnsnt of a band at 2160 cm-r to a low-energy OH-stretching vibration. These OH groups occur in strong hydrogen bridges with a bonding energy of approximately 4oU/mole, along with the "normal" OH groups in the O(10)-H ...O(4) bridge. Furthermore, four OH librational modes could be identi-fied in the region below I100 cm-t. The samples studied by IR spectroscopy were synthesized at 14 kbar and 700oC in the systems CaOAl2O3-SiO2-HrO and -DrO, respectively.
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تاریخ انتشار 2007