Specific heat and thermal diffusivity of strontium barium niobate (Sr 1-xBaxNb2O6) single crystals
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香港中文大學研究人員
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摘要The specific heat and thermal diffusivity of Sr1-xBa xNb2O6 (x=0.33 and 0.48) single crystals have been measured between 130 and 500 K, and the sound velocity has been measured at 295 K. At x=0.33 the specific heat shows a broad peak at 335 K, indicating the onset of a ferroelectric phase transition. The peak sharpens and shifts to about 383 K at x=0.48. A jump in the thermal diffusivity D is observed at the transition. Away from the transition, however, D is roughly independent of temperature. There is very little anisotropy in D, with the value along the a axis marginally higher than that along the c axis. Outside the transition region the phonon mean free path l is approximately constant, and has values of 5.1 and 5.6 Å, respectively, below and above the transition. The low values of D and l are due to the disorder arising from the random distribution of five Sr/Ba ions over six possible sites in a unit cell.
著者Choy C.L., Leung W.P., Xi T.G., Fei Y., Shao C.F.
期刊名稱Journal of Applied Physics
出版年份1992
月份12
日期1
卷號71
期次1
出版社American Institute of Physics
出版地United States
頁次170 - 173
國際標準期刊號0021-8979
電子國際標準期刊號1089-7550
語言英式英語

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