Journal of Materials Science

, Volume 30, Issue 24, pp 6205–6208 | Cite as

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

  • M. A. Gaffar
  • A. Abu El-Fadl


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.


Lithium Electrical Resistivity Measuring Field Transition Point Transport Mechanism 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • M. A. Gaffar
    • 1
  • A. Abu El-Fadl
    • 1
  1. 1.Physics Department, Faculty of ScienceAssiut UniversityAssiutEgypt

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