resumo
Hybrid ferroelastic crystals have garnered considerable interest due to their promising potential as mechanical switches and sensors. The anomalous ferroelastic phase transitions, in which ferroelasticity occurs in the high-temperature phase rather than the low-temperature phase, are of particular interest, but they are sporadically-documented and none of them is involved in breaking of the chemical bonds. Herein, a hydroxyl-containing cation, i.e., Me3NOH+, is employed to construct a three-dimensional hybrid crystal (Me3NOH)2KBiCl6 (1). This crystal undergoes distinct two-step structural phase transitions with space-group changes of Pna21-P1121-P63mc, belonging to an anomalous temperature-reversed mm2F2 ferroelastic transition and a normal 6mmF2 ferroelastic transition, respectively. The anomalous ferroelastic transition is entirely driven by switchable K-O coordination bonds involving breaking and reformation. Notably, the dynamic behavior of Me3NOH+ cations along with the distortion of inorganic framework enables the manifestation of unusual "high-low-medium" second-harmonic generation-switching behaviors. This study presents the enormous benefits of switchable coordination bonds for inducing anomalous ferroelastic phase transitions, offering valuable insight for the exploration of new multifunctional ferroelastic materials. (sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic). (sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic). (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)K-O(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(Me3NOH)2KBiCl6. (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic), (sic)(sic)(sic)Pna21-P1121-P63mc(sic)(sic)(sic)(sic)(sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)mm2F2(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)6mmF2(sic)(sic)(sic)(sic)(sic). (sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)K-O(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic). (sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)"(sic)-(sic)-(sic)" (sic)(sic)(sic)(sic)(sic)(sic). (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) (sic)(sic), (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).
palavras-chave
ORGANIC-INORGANIC HYBRID; MOLECULAR PEROVSKITE
categoria
Materials Science
autores
Li, YB; Xu, WJ; Chen, XX; Liu, DX; Wang, ZS; Zhang, WX
nossos autores
Wei-Jian Xu
Investigador JúniorProjectos
Nano-argilas para remoção/captura de fosfatos (P) e sua reutilização como fertilizante (NATURAL)
agradecimentos
This work was supported by the National Natural Science Foundation Of China (22071273 and 21821003), and the Fundamental Research Funds for the Central Universities, Sun Yat-Sen University (23lgzy001).