Dielectric properties of fine-grained PbTiO3 crystals precipitated in a glass |
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Authors: | T Kokubo M Tashiro |
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Institution: | Institute for Chemical Research, Kyoto University, Uji, Kyoto-Fu, 611, Japan |
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Abstract: | The spontaneous deformation of PbTiO3 crystals precipitated in a PbOTiO2Al2O3SiO2 glass was found to decrease with decreasing grain size. This trend remains even after the glass matrix surrounding PbTiO3 crystals is removed completely by HNO3 acid immersion. Consequently, a linear electro-optic effect cannot be expected from transparent glass-ceramics which necessarily comprise very-fine-grained crystals. The dielectric constant of PbTiO3 crystals surrounded by a glassy matrix shows two maxima at grain sizes 0.15 μm and 250 Å, but is still fairly high even at a grain size as small as 160 Å. This suggests that a material with a large quadratic electro-optic effect may be produced from a transparent glass-ceramic. The maxima of the dielectric constant at grain sizes 0.15 μm and 250 Å were interpreted in terms of the internal stress and internal electric field, respectively. |
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