Low temperature electrical conductivity,dielectric constant,and phase transitions in (NH4)2SO4 and (ND4)2SO4 |
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Authors: | U. Syamaprasad C.P.G. Vallabhan |
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Affiliation: | Department of Physics, University of Cochin, Cochin-682022, India |
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Abstract: | Careful axiswise measurements of d.c. conductivity and dielectric constants of (NH4)2SO4 from 50 to - 196°C establish two distinct phase transitions, instead of one, at temperatures -49.5 and -58°C which remain unchanged in (ND4)2SO4. Explanation based on successive distortions of non-equivalent (NH4)+ is offered. Low temperature transport process in the crystal also is discussed. |
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