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Raman Spectrum Analysis on the Solid--Liquid Boundary Layer of BGO Crystal Growth |
| ZHANG Xia1;YIN Shao-Tang1;WAN Song-Ming1;YOU Jing-Lin2;CHEN Hui2;ZHAO Si-Jie2;ZHANG Qing-Li1 |
| 1Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 2300312Shanghai Enhanced Laboratory of Ferrometallurgy, Shanghai University, Shanghai 200072 |
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| Cite this article: |
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ZHANG Xia, YIN Shao-Tang, WAN Song-Ming et al 2007 Chin. Phys. Lett. 24 1898-1900 |
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Abstract We study the Raman spectra of Bi4Ge3O12 crystal at different temperatures, as well as its melt. The structure characters of the single crystal, melt and growth solid--liquid boundary layer of BGO are investigated by their high-temperature Raman spectra for the first time. The rule of structure change of BGO crystal with increasing temperature is analysed. The results show that there exists [GeO4] polyhedral structure and Bi ion independently in BGO
melt. The bridge bonds Bi--O--Bi and Bi--O--Ge appear in the crystal and at the boundary layer, but disappear in the melt. The structure of the growth solid--liquid boundary layer is similar to that of BGO crystal. In the melt, the long-range order structure of the crystal disappears. The thickness of the growth solid--liquid boundary layer of BGO crystal is about 50μm.
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33.20.Fb
81.10.Aj
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Received: 27 December 2006
Published: 25 June 2007
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| PACS: |
33.20.Fb
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(Raman and Rayleigh spectra (including optical scattering) ?)
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81.10.Aj
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(Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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