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Electrical resistivity of single-crystal lithium ammonium sulphate between 300 and 500 K

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Abstract

The d.c.,electrical resistivity, θ, of pure LiNH4SO4 single crystals has been measured between 300 and 500 K in three successive runs. Anomalous behaviour before and at the transition point was observed and thermal annealing was necessary for reproducible results. The temperature dependence of θ along the polar axis yielded the values ΔE=0.54 and 1.48 eV and ΔE=1.95 eV for the energy activating the charge transport mechanisms in the ferroelectric and the paraelectric phases, respectively. A “pre-transition” phenomenon was observed while measuring ϱ along the a- and b-axes. The J-E characteristics indicated possible space-charge effects at low measuring fields. The mechanism of electrical conduction in the measuring range has been discussed.

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Authors and Affiliations

  1. Physics Department, Faculty of Science, Assiut University, Assiut, Egypt

    M. A. Gaffar & A. Abu El-Fadl

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  1. M. A. Gaffar
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  2. A. Abu El-Fadl
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Gaffar, M.A., El-Fadl, A.A. Electrical resistivity of single-crystal lithium ammonium sulphate between 300 and 500 K. Journal of Materials Science 30, 6205–6208 (1995). https://doi.org/10.1007/BF00369667

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  • DOI: https://doi.org/10.1007/BF00369667

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