Grain Orientation and Electrical Properties of Hot-Forged Bi_4Ti_3O_<12> Ceramics
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概要
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The effect of grain orientation on the dielectric properties of hot-forged ferroelectric Bi_4Ti_3O_<12> ceramics has been investigated and the properties are compared with ordinarily fired ones. The degree of grain orientation f calculated from X-ray diffraction patterns is found to be as large as 0.95. The temperature dependences of the dielectric constant ε_s and loss tangent tan δ are measured with a Q-meter at 12 MHz in the perpendicular [⊥] and parallel [//] directions to the forging axis, and considerable anisotropies, such as ε_s [⊥]/ε_s [//]=5 at the Curie temperature of about 680℃ are seen. The remanent polarization P_r is calculated for both cases of perfect (f=1) and random (f=0) grain orientations. Observed P_r values from hysteresis loops are smaller than calculated ones, the ratio of the former to the latter being about 82% for the hot-forged ceramics.
- 社団法人応用物理学会の論文
- 1980-01-05
著者
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Takenaka Tadashi
Department Of Electrical Engineering Faculty Of Science And Technology Science University Of Tokyo
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Takenaka Tadashi
Depart. Elect. Eng. Fac. Science And Technology Science University Of Tokyo
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Sakata Koichiro
Faculty Of Science And Technology Science University Of Tokyo
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Sakata Koichiro
Department Of Electrical Engineering Faculty Of Science And Technology Science University Of Tokyo
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Sakata Koichiro
Depart. Elect. Eng. Fac. Science And Technology Science University Of Tokyo
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Sakata Koichiro
Faculty Of Science Technology Science University Of Tokyo
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TAKENAKA Tadashi
Department of Electrical Engineering, Faculty of Science and Technology, Science University of Tokyo
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