The temperature characteristics of dielectric constants, spontaneous polarization, thermal‐expansion coefficients, indices of refraction, and optical rotatory power of Pb5Ge3O11 single crystals have been investigated in detail from room temperature up to above the Curie temperature, 177°C. From the results of these measurements, the following constants were obtained: linear thermal‐expansion coefficients (αa)F=7.75×10−6/deg°C and (αc)F=7.79×10−6/deg°C (ferroelectric phase), (αa)P=13.8×10−6/deg°C and (αc)P=13.4×10−6/deg°C (paraelectric phase); quadratic electro‐optic constants ; and electrogyration coefficient γ33 =8.7 cm2/C. An isomorphous compound Pb5(Ge2O7)(SiO4) was synthesized and was found to be ferroelectric with T c=60°C and Ps=1.7 μC/cm2 at room temperature. Ferroelectric properties and electrogyration coefficient were studied in the solid‐solution system Pb5(Ge2O7)(GeO4)1−x (SiO4)x.
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December 1972
Research Article|
December 01 1972
Ferroelectric and optical properties of Pb5Ge3O11 and its isomorphous compound Pb5Ge2SiO11
Hiroshi Iwasaki;
Hiroshi Iwasaki
Musashino Electrical Communication Laboratory, Musashino‐shi, Tokyo, Japan
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Shintaro Miyazawa;
Shintaro Miyazawa
Musashino Electrical Communication Laboratory, Musashino‐shi, Tokyo, Japan
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Hideo Koizumi;
Hideo Koizumi
Musashino Electrical Communication Laboratory, Musashino‐shi, Tokyo, Japan
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Kiyomasa Sugii;
Kiyomasa Sugii
Musashino Electrical Communication Laboratory, Musashino‐shi, Tokyo, Japan
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Nobukazu Niizeki
Nobukazu Niizeki
Musashino Electrical Communication Laboratory, Musashino‐shi, Tokyo, Japan
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J. Appl. Phys. 43, 4907–4915 (1972)
Article history
Received:
May 22 1972
Citation
Hiroshi Iwasaki, Shintaro Miyazawa, Hideo Koizumi, Kiyomasa Sugii, Nobukazu Niizeki; Ferroelectric and optical properties of Pb5Ge3O11 and its isomorphous compound Pb5Ge2SiO11. J. Appl. Phys. 1 December 1972; 43 (12): 4907–4915. https://doi.org/10.1063/1.1661044
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