New Ferroelectrics Based on Divalent Metal Ion Alum
- 17 August 2009
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 131 (35), 12544-12545
- https://doi.org/10.1021/ja905399x
Abstract
A detailed study of two alum-type complexes containing the SeO42- anion, 1,4-diazoniabicyclo[2.2.2]octane hexaaquacopper(II) bis(selenate) [(H2dbco)Cu(H2O)6(SeO4)2, 1] and its deuterated analogue (D2dbco)Cu(D2O)6(SeO4)2 (2), has revealed that 1 and 2 are new ferroelectrics that undergo a paraelectric−ferroelectric phase transition at ca. −140 to −138 °C as a result of order−disorder features of the cation ([H2dbco]2+ or [D2dbco]2+) and anion (selenate). These are the first examples of ferroelectrics based on divalent metal anion alum analogues since the discovery of ferroelectrics based on trivalent metal anion alum in ∼1960.Keywords
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