Tunable dielectric transitions in layered organic–inorganic hybrid perovskite-type compounds: [NH3(CH2)2Cl]2[CdCl4−4xBr4x] (x = 0, 1/4, 1). Issue 20 (8th May 2018)

• Record Type: Journal Article
• Authors: Chen, Hai-Peng; Shi, Ping-Ping; Wang, Zhong-Xia; Gao, Ji-Xing; Zhang, Wan-Ying; Chen, Cheng; Tang, Yuan-Yuan; Fu, Da-Wei
• Is Part Of: Dalton transactions. Volume 47:Issue 20(2018)
• Page Start: 7005
• Page End: 7012
• Publication Date: 2018-05-08
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt00353j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Molecular bistable dielectric switches represent a class of highly desirable intelligent materials due to their sensitive switchable responses, simple and environmentally friendly processing, light weights, and mechanical flexibility. Abstract : Molecular bistable dielectric switches represent a class of highly desirable intelligent materials due to their sensitive switchable responses, simple and environmentally friendly processing, light weights, and mechanical flexibility. However, most of these switches can only work at a very low temperature, extremely limiting their potential applications. Herein, three layered organic–inorganic hybrid perovskite-type compounds of the general formula A2 BX4, [NH3 (CH2 )2 Cl]2 [CdCl3 Br] (1 ), [NH3 (CH2 )2 Cl]2 [CdCl4 ] (2 ) and [NH3 (CH2 )2 Cl]2 [CdBr4 ] (3 ), which display sensitive dielectric switching reversibility and remarkable switching anti-fatigue, have been successfully designed. Differential scanning calorimetry and dielectric measurements for1 confirm its reversible phase transition at around 166 K. Through anion modulation, the phase transition temperatures of2 and3 can be greatly improved up to 237 K and 254 K, respectively. Structural analysis discloses that the phase transition temperature's shifts may result from the differences among the inorganic frameworks. Moreover, due to the significant order–disorder transitions of ammonium cations, the permittivities of1, 2 and3 change abruptly at around the phase transition points, making them excellent stimuli-responsive electrical switches. Such an anion-modulated method will open up new possibilities of highly efficiently tuning the phase transition temperature of molecular bistable dielectric switches.