The dielectric properties of deuterated triammonium deuterium disulfate have been studied at 1 atm in the temperature region between -170° C and 25° C . It has been found that the crystal is ferroelectric in two phases. The spontaneous polarization is 2.15 µCoul·cm -2 at -170° C . The present results indicate a large isotope effect on ferroelectric activity.
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Ôsaka et al. (1977) studied this question.
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