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Electrical conductivity, thermoelectric power and dielectric constant of NiWO4

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Abstract

The a.c. electrical conductivity (σ ac), thermoelectric power (θ) and dielectric constant (ε′) of antiferromagnetic NiWO4 are presented. σ ac and ε′ have been measured in the temperature range 300 to 1000 K and θ in the temperature range 600 to 1000 K. Conductivity data are interpreted in the light of band theory of solids. The compound obeys the exponential law of conductivity σ=σ 0 exp (−W/kT). Activation energy has been estimated as 0.75eV. The conductivity result is summarized in the following equation σ=2.86 exp (−0.75 eV/kT)Ω−1 cm−1 in the intrinsic region. The material is p-type below 660 K and above 950 K, and is n-type between 660 and 950 K.

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Authors and Affiliations

  1. Department of Physics, University of Gorakhpur, 273001, Gorakhpur, India

    R. Bharati & R. A. Singh

  2. Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK

    B. M. Wanklyn

Authors
  1. R. Bharati
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  2. R. A. Singh
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  3. B. M. Wanklyn
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Bharati, R., Singh, R.A. & Wanklyn, B.M. Electrical conductivity, thermoelectric power and dielectric constant of NiWO4 . J Mater Sci 15, 1293–1296 (1980). https://doi.org/10.1007/BF00551819

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  • DOI: https://doi.org/10.1007/BF00551819

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