Some of the title compounds have been found to exhibit ferroelectricity at room temperature. Their structure types can be classified in three series according to the cations coordination number (CN) and size: 1.- single cation with CN 4: olivine and glaserite; 2.- two cations with CN 4: Beryllonite and stuffed tridymite; 3.- all cations with CN 4: α-LiZnPO4 is the unique case known.
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Elouadi et al. (1990) studied this question.
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