Far-infrared spectra of synthetic ^[4][(Al_2-xGa_x)(Si_2-yGe_y)] (OH,OD,F)₂- kinoshitalite: Characterization and assignment of the interlayer Ba-O_inner and Ba-O_outer stretching bands

抄録

Far-infrared spectroscopy and X-ray diffraction Rietveld structure refinement for tetrahedral Al-for-Ga and Si-for-Ge substituted synthetic kinoshitalites (Kn) have been made. In the 170-40 cm^-1 far-infrared region, three bands are dominant; an in-plane tetrahedral torsional mode, an interlayer Ba-Oinner stretching vibration and a Ba-Oouter stretching vibration. The ranges of absorption frequencies and their corresponding deformation modes are as follows: (1) in-plane tetrahedral torsional mode: 105-150 cm^-1; (2) Ba-Oinner stretching vibration: 105-140 cm^-1; (3) Ba-Oouter stretching vibration: 75-90 cm^-1.