Abstract
Careful axiswise measurements of d.c. conductivity and dielectric constants of (NH 4) 2SO 4 from 50 to - 196°C establish two distinct phase transitions, instead of one, at temperatures -49.5 and -58°C which remain unchanged in (ND 4) 2SO 4. Explanation based on successive distortions of non-equivalent (NH 4) + is offered. Low temperature transport process in the crystal also is discussed.
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