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Multi-step structural phase transitions with novel symmetry breaking and inverse symmetry breaking characteristics in a [Ag4I6]2− cluster hybrid crystal

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Abstract

In this study, a multi-step phase transition hybrid composed of (Pr-dabco)2Ag4I6 clusters (Pr-dabco+ = 1-propyl-1,4-diazabicyclo[2.2.2]octan-1-ium) has been prepared and characterized by microanalysis, IR and UV-vis spectroscopy, TG and DSC techniques, etc. This hybrid is thermally stable up to ∼486 K with five phases in the temperature region below 486 K. The phase transition shows symmetry breaking (SB) character between phases II (space group P21/c) and III (space group Pa[3 with combining macron]), while inverse symmetry breaking (ISB) between phases II and I (space group Pbca), and it is rather exceptional for matter to exhibit simultaneously SB and ISB nature in two successive phase transitions. Most importantly, each phase transition is associated with a dielectric anomaly, and phase V appears to be a plastic crystal with extra high ac conductivity (>10−2 S cm−1). Our work opens up new avenues to find a multi-phase transition material in silver halide hybrids.

Graphical abstract: Multi-step structural phase transitions with novel symmetry breaking and inverse symmetry breaking characteristics in a [Ag4I6]2− cluster hybrid crystal

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Publication details

The article was received on 27 Oct 2019, accepted on 03 Dec 2019 and first published on 03 Dec 2019


Article type: Communication
DOI: 10.1039/C9CC08394D
Chem. Commun., 2020, Advance Article

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    Multi-step structural phase transitions with novel symmetry breaking and inverse symmetry breaking characteristics in a [Ag4I6]2− cluster hybrid crystal

    J. Zhang, W. Yao, L. Sang, X. Pan, X. Wang, W. Liu, L. Wang and X. Ren, Chem. Commun., 2020, Advance Article , DOI: 10.1039/C9CC08394D

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