Triple 60 Hz hysteresis loops have been observed in (NH 4 ) 2 SO 4 , (NH 4 ) 2 BeF 4 and K 2 SeO 4 crystals of the (NH 4 ) 2 SO 4 family. From these experimental results and other facts already known, these ferroelectrics are concluded to be really ferrielectric.
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Sawada et al. (1980) studied this question.
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