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Order-disorder transformation of intercalated cations triggered huge negative thermal expansion, switchable dielectrics and ion conduction near room temperature in a 2D vanadium oxide hybrid

Abstract

In many cases, the zero/negative thermal expansion (ZTE/NTE) materials are much desired. However, it is still a tremendous challenge to predict theoretically and achieve successfully new families of ZTE/NTE materials by rational structure designs. Herein we present a new family in low thermal expansion/NTE materials, a lamellar vanadium oxide hybrid [C3H12N2][V4O10] consists of mixed-valence {V4O102-} monolayers and propane-1, 3-diammonium cations in the interlayers. The inorganic layer is parallel to the (001) plane and comprised of edge-sharing VO5 square pyramids linked together via corner-sharing VO4 tetrahedra. The hybrid shows low thermal expansion coefficient (~10-6 K−1) in the wide temperature ranges (90-250 K) and colossal NTE (~600×10-6 K−1) between 293 and 330 K. Additionally, a revisable thermal anomaly occurs at ~328/316 K upon heating/cooling, associated with a structure phase transition, which gives rise to the switchable dielectric and ion-conducting properties. This study provides a new way for exploring new low thermal expansion/NTE, switchable dielectric and ion-conducting multifunctional materials in lamellar vanadium oxide hybrids.

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Publication details

The article was received on 05 Sep 2019, accepted on 30 Sep 2019 and first published on 01 Oct 2019


Article type: Paper
DOI: 10.1039/C9TC04911H
J. Mater. Chem. C, 2019, Accepted Manuscript

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    Order-disorder transformation of intercalated cations triggered huge negative thermal expansion, switchable dielectrics and ion conduction near room temperature in a 2D vanadium oxide hybrid

    Z. Yao, Y. Qian, Q. Ren, G. Zhang, J. Zhang, L. Liu, H. Luo and X. Ren, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC04911H

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