Abnormally large variations in the values of epsilon a , epsilon b , and epsilon c are observed in (NH 4 ) 2 SO 4 at 151.5 degrees C with a thermal hysteresis of 9 degrees C, confirming the phase transition suggested earlier by the authors from conductivity and TSC studies. The transition temperature is 162 degrees C for (ND 4 ) 2 SO 4 , implying that ammonium ions are involved in the process.
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Syamaprasad et al. (1981) studied this question.
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