大型PLZTセラミックスの均一性
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概要
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Optical transmittance, grain size and ferroelectric properties are measured along the radial direction of large-scale (40-50 mm<SUP>φ</SUP>) PLZT-7.6/70/30 ceramics in order to evaluate the homogeneity in a plate. Ferro-antiferroelectric transition temperatures (<I>T<SUB>h</SUB></I>) are measured by the pyroelectric method. In addition, compositional fluctuations in a PLZT plate are discussed by measuring the variation of <I>T<SUB>h</SUB></I>. Results indicate that grain size (<I>G<SUB>s</SUB></I>), coercive field (<I>E<SUB>c</SUB></I>) and remanent polarization (<I>P<SUB>r</SUB></I>) are uniform within experimental errors through large-scale specimens. Optical transmittance is also uniform except at the fringe of a plate. Moreover, the optical transmittance is found to be sensitive to hot-pressing conditions and inhomogeneities in a plate, while <I>E<SUB>c</SUB></I> and <I>P<SUB>r</SUB></I> are not sensitive. Consequently, the measurement of the optical transmittance is effective in the evaluation of homogeneities in large-scale PLZT plates. Transition temperature variation indicates that the fluctuation of Zr concentration through a ceramic plate is 0.04 mol % by assuming La distribution to be uniform; the fluctuation of La concentration is 0.01 at % by assuming a uniform Zr distribution.
- 社団法人 粉体粉末冶金協会の論文
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