Ferroelectric phase transitions in NH4HSeO4 crystals |
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| Authors: | R. Poprawski J. Dziedzic |
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| Affiliation: | Institute of Physics, Technical University of Wroc?aw, Wybrze?e Wyspiańskiego 27, 50-370 Wroc?aw, Poland |
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| Abstract: | Results are presented of measurements of spontaneous polarization, electric permittivity and electrical conductance of NH4HSeO4 crystals in three principal crystallographic directions from liquid nitrogen temperature to 320 K. NH4HSeO4 crystals exhibit ferroelectric properties in the a-axis direction between 106–250 K, whereas in the b-direction they are pyroelectrie over the entire temperature range. The calculated activation energy (1.42 eV) is indicative of semiconducting behavior. |
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