Ferroelectric properties, narrow band gap and ultra-large reversible entropy change in a novel nonlinear ionic chromium() compound

A novel chromium( vi )-based compound, [(CH 3 CH 2 ) 3 N(CH 2 Cl)][CrO 3 Cl] ( 1 ), undergoes a high-temperature phase transition at around 340.9 K, accompanied by an ultra-large entropy change of 63.49 J mol −1 K −1 . Compound 1 exhibits a moderate ferroelectric polarization of 0.48 μC cm −2 and a...

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Published inChemical communications (Cambridge, England) Vol. 57; no. 85; pp. 11225 - 11228
Main Authors Han, Ding-Chong, Gong, Zhi-Xiang, Song, Ning, Tan, Yu-Hui, Li, Yu-Kong, Tang, Yun-Zhi, Du, Peng-Kang, Zhang, Hao
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 26.10.2021
Subjects
chromium
Compound A
energy
Energy gap
Energy storage
Entropy
Ferroelectric materials
Ferroelectricity
Hexavalent chromium
High temperature
phase transition
Phase transitions
Tetrahedra
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Summary:A novel chromium( vi )-based compound, [(CH 3 CH 2 ) 3 N(CH 2 Cl)][CrO 3 Cl] ( 1 ), undergoes a high-temperature phase transition at around 340.9 K, accompanied by an ultra-large entropy change of 63.49 J mol −1 K −1 . Compound 1 exhibits a moderate ferroelectric polarization of 0.48 μC cm −2 and a remarkable CD signal. Strikingly, 1 occupies a narrow band gap of 2.22 eV, which is chiefly attributed to the inorganic [CrO 3 Cl] − tetrahedron. It is believed that these findings will contribute to an alternative pathway for the design of multifunctional ferroelectric materials, whose potential applications will be in semiconductors, energy storage, etc. A novel nonlinear chromium( vi ) compound, [(CH 3 CH 2 ) 3 N(CH 2 Cl)][CrO 3 Cl], undergoes a high-temperature phase transition with a moderate ferroelectric polarization of 0.48 μC cm −2 , a remarkable CD signal, a giant entropy change and a narrow band gap of 2.22 eV.
Bibliography:Electronic supplementary information (ESI) available: Experimental details and characterization. Table of the crystallographic data, IR spectrum, PXRD patterns, SHG signals and band structures. CCDC
10.1039/d1cc04751e
2091371
at 298 K. For ESI and crystallographic data in CIF or other electronic format see DOI
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ISSN:1359-7345
1364-548X
1364-548X
DOI:10.1039/d1cc04751e