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.
Received: 20 September 2005
Revised: 24 November 2005
Accepted manuscript online:
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