X-Ray Studies of the Lattice Vibration in Tetragonal Barium Titanate
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概要
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Thermal diffuse scattering of X-rays by tetragonal barium titanate is studied. Two kinds of diffuse streaks, S_A and S_O, are observed in addition to thermal diffuse spots F near reciprocal lattice points. S_A and F, which show intensity modulation in phase with the static structure factor, are due to acoustic lattice vibration. S_O, which shows a different intensity modulation from them, is concluded to be due to low frequency transverse optic lattice vibration which plays an important role in the ferroelectric transition of the substance. The models a stretching type vibration in which all the oxygen atoms vibrate to the oposite direction against barium and titanium atoms, and the frequency is estimated to be of the order of 10^<12>cm^<-1>. The atomic shifts of ferroelectric polarization are discussed in relation to the vibration.
- 社団法人日本物理学会の論文
- 1967-01-05
著者
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Harada Jimpei
Physics Department Tokyo Institute Of Technology
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Honjo Goro
Physics Department Tokyo Institute Of Technology
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Honjo Goro
Physics Department Tokyo Institute Of Technology Oh-okayama
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Harada Jimpei
Physics Department Tokyo Institute Of Technology Oh-okayama
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