Research of Tb:Mo:PbWO4 Crystal Structure by Raman Spectra
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Liu Weihai Xu Yanling Wang Rui Shi Liansheng Yang Tongyong Yang Chunhui
Key words：lead tungstate crystal; Raman spectra; Tb Mo co-doped;
Abstract: The structure of Tb:Mo:PbWO4 crystals was investigated by Raman spectra and the results showed that the spectra were varied differently by doping dopants in different ranges of shift. Rotation-vibration, curving-vibration and non-symmetrical stretching-vibration had been investigated on the spectra. Rotation-vibration intensity of [WO4]2- group is weakened and curving-vibration intensity is undergirded; low Mo6+ doping enhances the intensity of non-symmetrical stretching-vibration, with the concentration of Mo6+ increasing, the intensity is weakened. So it could be inferred that Tb3+ ion replaced the vacancy of Pb, when achieving at a certain concentration, Tb3+ ion would substitute for the lattice of Pb2+, Mo6+ ion would substitute for W lattice and generate [MoO4]2- new group, these are the main reason for the properties changing. Furthermore it could suggest that the impurity ions doped in tetrahedral positions, strongly affect the electron-phonon coupling in [WO4]2-, which makes the intensities of the vibration changed regularly.
Liu Weihai1，Xu Yanling1，Wang Rui1，Shi Liansheng2，Yang Tongyong1，Yang Chunhui1
(1.The Department of Applied Chemistry, Harbin Institute of Technology, Heilongjiang 150001, China;
2.The Department of Material, Harbin University of Science and Technology, Heilongjiang 150086, China)
Abstract:The structure of Tb:Mo:PbWO4 crystals was investigated by Raman spectra and the results showed that the spectra were varied differently by doping dopants in different ranges of shift. Rotation-vibration, curving-vibration and non-symmetrical stretching-vibration had been investigated on the spectra. Rotation-vibration intensity of [WO4]2- group is weakened and curving-vibration intensity is undergirded; low Mo6+ doping enhances the intensity of non-symmetrical stretching-vibration, with the concentration of Mo6+ increasing, the intensity is weakened. So it could be inferred that Tb3+ ion replaced the vacancy of Pb, when achieving at a certain concentration, Tb3+ ion would substitute for the lattice of Pb2+, Mo6+ ion would substitute for W lattice and generate [MoO4]2- new group, these are the main reason for the properties changing. Furthermore it could suggest that the impurity ions doped in tetrahedral positions, strongly affect the electron-phonon coupling in [WO4]2-, which makes the intensities of the vibration changed regularly.
Key words:lead tungstate crystal; Raman spectra; Tb Mo co-doped;
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