Vibrational study of (NH4)2HPO4 and (ND4)2DPO4 single crystals. The PO4 ion vibration couplings |
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| Institution: | 1. Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China;2. Hebei Engineering Research Center of Pollution Control in Power System, Tianjin, 300401, China;3. Engineering Research Center of Seawater Utilization Technology of Ministry of Education, School of Chemical Engineering, Hebei University of Technology, Tianjin, 300401, China;1. Facultad de Ingeniería, Benemérita Universidad Autónoma de Puebla, Apdo. Postal J-39, Puebla, Pue 72570, Mexico;2. Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;3. Tecnológico Nacional de México/I. T.Puebla, Av. Tecnológico No. 420, Maravillas, C.P, Puebla, Pue 72220, Mexico |
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| Abstract: | The PO4 internal vibrations have been studied by measuring the polarized infrared (IR) spectra at room temperature (RT) and at low temperature (LT=20K) as well as the polarized Raman (R) spectra. The i.r. dichroism in the (010) plane is investigated in a great range of angles α (0°<α<135°) of the electric vector E with respect to the crystallographic axic c. Some intra ion couplings are inferred. No factor group splitting is observed in the RT IR spectra. However, simultaneously regarding the LT IR spectra and the R spectra promotes an interchain coupling inside the primitive cell. Strong resonance coupling effects are found for the PO4 stretching modes with the in-plane mode δOH(δOD). |
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