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Molecular Disorder Induces an Unusual Phase Transition in a Potential 2D Chiral Ferroelectric Perovskite
Author(s) -
Sui Li Lin,
Juan Wei Wen,
Qiang Gao Hong,
Hui Tan Yu,
Bo Han Xiao
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202100334
Subject(s) - ferroelectricity , triclinic crystal system , monoclinic crystal system , tetragonal crystal system , octahedron , crystallography , perovskite (structure) , phase transition , halide , materials science , phase (matter) , crystal structure , chemistry , condensed matter physics , inorganic chemistry , dielectric , physics , organic chemistry , optoelectronics
Two‐dimensional hybrid halide perovskites with single chiral and ferroelectricity together with various structural phase transitions provide the possibility for more diverse functional properties. Here, we present a 2D chiral hybrid halide perovskite ferroelectric, [C 6 H 5 (CH 2 ) 4 NH 3 ] 2 CdCl 4 (4PBA−CdCl 4 , 4PBA=4‐phenylbutylamine) that experiences two continuous phase transitions from centrosymmetric triclinic P 1 ‾ to polar chiral monoclinic P 2 and then to another centrosymmetric tetragonal P 4 /mmm with increasing temperature, accompanied by symmetry breaking, due to the prominent octahedral distortion and disorder transformation of organic 4PBA cations. In the polar chiral phase, 4PBA−CdCl 4 gives a significant CD signal and has a moderate ferroelectric polarization of 0.35 μC/cm 2 . In addition, 4PBA−CdCl 4 occupies a wide band gap of 4.376 eV that is chiefly contributed by the inorganic CdCl 6 octahedron. This finding offers an alternative pathway for designing new phase transitions and related physical properties in hybrid halide perovskites and other hybrid crystals.