Brillouin Scattering Studies of the Uniaxial Ferroelectric Phase Transition in TGS and TGSe
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概要
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The Brillouin spectra of the ferroelectric triglycine sulfate (TGS) and its isomorphous selenate (TGSe) crystals have been observed in three cases of orientations of the longitudinal or quasi-longitudinal phonon vector q; (1) q⫽c-axis, (2) q⫽b-axis and (3) q deviates 5° from b-axis in the (100) plane. The temperature dependence of both the frequency shift and the spectral width shows a remarkable anisotropy near T_c. In the case (1) the temperature at which the width becomes maximum shifts to the lower temperature than T_c which has simultaneously been determined by an accompanied measurement of dielectric constant. The polarization relaxation time is determined from this temperature shift using the phenomenological relation. In the case (2) and the case (3), the decrease in the anomaly is explained as the depolarization field effect of the long range dipole-dipole interaction which is characteristic in the ferroelectric phase transition.
- 社団法人日本物理学会の論文
- 1976-05-15
著者
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TOKUNAGA Masaharu
Research Institute of Applied Electricity,Hokkaido University
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Yagi Toshirou
Research Institute Of Applied Electricity Hokkaido University:department Of Physics Faculty Of Scien
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TATSUZAKI Itaru
Research Institute of Applied Electricity,Hokkaido University
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Yagi Toshirou
Research Institute Of Applied Electricity Hokkaido University
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Tokunaga Masaharu
Research Institute Of Applied Electricity Hokkaido University
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Yagi Toshirou
Reseach Institute For Electronic Science Hokkaido University
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Tatsuzaki Itaru
Research Institute Of Applied Electricity Hokkaido University
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