Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 287, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2020.121329
Keywords
Crystal growth; Phase transitions; Differential scanning calorimetry (DSC); Crystal structure; Dielectric properties
Funding
- National Natural Science Foundation of China [21865033]
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An indium-based organic-inorganic phase transition material (C5H16N2)InBr5 (1) was synthesized by the reaction of In2O3 and 2, 2-dimethyl-1, 3-propanediamine in excess hydrobromic acid solution. Differential scanning calorimetry (DSC) measurement reveals that 1 experiences a first-order structural phase transition at Curie temperature Tc = 176 K. A step-like dielectric anomaly was recorded at around phase transition temperature. Further the variable-temperature single crystal X-ray diffraction indicates that the order-disorder transition of (C5H16N2)(2+) cation is the main factor drove the phase transition, changing from the non-centrosymmetric (NCS) space group of P2(1)2(1)2(1) to centrosyrnmetric (CS) space group Pnma upon heating. This finding paves the avenue to design and explore dielectric switching materials based on In-based organic-inorganic hybrid compounds.
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