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Chinese Physics, 2006, Vol. 15(4): 854-858    DOI: 10.1088/1009-1963/15/4/033
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Raman spectroscopic study of ceramic Sr2Bi4Ti5O18

Du Chao-Ling (杜朝玲)a,  Zhang Shan-Tao (张善涛)b, Lu Ming-Hui (卢明辉)b, Gu Zheng-Bin (顾正彬)b,  Cheng Guang-Xu (程光煦)a, Wang Jia (王佳)a, Chen Yan-Feng (陈延峰)b
a National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, China; b National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
Abstract  Raman spectra of ceramic Sr2Bi4Ti5O18 (SBTi5) are reported to consist of four different Raman bands.Temperature-dependent spectra reveal the relationship between the lattice vibration and the material's structure. There appears a relatively large change in structure of the material at about 273K.The anharmonic potential of the material has a great influence on its phonon mode full width at half maximum (FWHM), which can be expressed by a function of temperature. Theoretical fittings of the FWHMs for the two modes at around 312 cm-1 and 464 cm-1 indicate that the latter phonon mode is more anharmonic than the former one.
Keywords:  Raman spectra      anharmonic potential      superposition      phonon mode  
Received:  20 September 2005      Revised:  24 November 2005      Accepted manuscript online: 
PACS:  77.84.Dy  
  61.05.cp (X-ray diffraction)  
  63.20.Ry (Anharmonic lattice modes)  
  77.80.-e (Ferroelectricity and antiferroelectricity)  
  78.30.Hv (Other nonmetallic inorganics)  
Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No 001CB610404).

Cite this article: 

Du Chao-Ling (杜朝玲), Zhang Shan-Tao (张善涛), Lu Ming-Hui (卢明辉), Gu Zheng-Bin (顾正彬), Cheng Guang-Xu (程光煦), Wang Jia (王佳)a, Chen Yan-Feng (陈延峰) Raman spectroscopic study of ceramic Sr2Bi4Ti5O18 2006 Chinese Physics 15 854

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