Ferroelectric Pb5-xBix (Ge.Si)3-xBxO11 single crystals as a material for IR radiation detectors |
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Authors: | H H Otto P Loster |
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Affiliation: |
a Materialwissenschaftliche Kristallographie, TU Clausthal, Clausthal-Zellerfeld, FRG |
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Abstract: | The coupled substitution of Bi3+ for Pb2+ and B3+ for Ge4+ was successfully achieved in ferroelectric Pb5Ge3O11. Large single crystals of optical quality were grown from the melt. Deterioration of the crystal quality could not be observed within a period of two years under ambient conditions. The dielectric permittivity εr, electric conductivity p and pyroelectric coefficient γ are investigated as a function of temperature. The room temperature data (εr = 43, γ = 2.4·10-4Cm-2 K-1, p = 7·107 Ω, volume specific heat s = 2·106 Jm-3K-1) show the usefulness of Pb5-xBixGe3-xBxO11 around x = 0.1 as a material for pyroelectric thermal detectors operating at room temperature. Also the difficulty of producing lead germanate silicate mixed crystals in the size and quality needed for vidicon applications is overcome by additional replacement of some Pb and Ge by Bi and B. |
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Keywords: | Lead germanate pyroelectric IR detector ferroelectric compound |
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