Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 25, Pages 6447-6454Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201900771
Keywords
ferroelastic domains; halogen substitution; magnetic ordering; perovskite; spontaneous strain
Categories
Funding
- National Natural Science Foundation of China [21771037, 21805033]
- Natural Science Foundation of Jiangsu Province (JSNSF) [BK20170659]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12010103]
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Organic-inorganic hybrid perovskite-type multiferroics have attracted considerable research interest owing to their fundamental scientific significance and promising technological applications in sensors and multiple-state memories. The recent achievements with divalent metal dicyanamide compounds revealed such malleable frameworks as a unique platform for developing novel functional materials. Herein, two 3D organic-inorganic hybrid perovskites [Et3P(CH2)(2)F][Mn(dca)(3)] (1) and [Et3P(CH2)(2)Cl][Mn(dca)(3)] (2) (dca= icyanamide, N(CN)(2)(-)) are presented. Accompanying the sequential phase transitions, they display a broad range of intriguing physical properties, including above room temperature ferroelastic behavior, switchable dielectricity, and low-temperature antiferromagnetic ordering (T-c = 2.4K for both 1 and 2). It is also worth noting that the spontaneous strain value of 1 is far beyond that of 2 in the first ferroelastic phase, as a result of the precise halogen substitution. From the point view of molecular design, this work should inspire further exploration of multifunctional molecular materials with desirable properties.
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