Large dielectric switch effects induced by an order-disorder transformation in cyclopropylamine perchlorate crystals

• Published in: Nanoscale Vol. 14; no. 3; pp. 675 - 679
• Main Authors: Gao, Zhangran, Wu, Yuying, Jiao, Shulin, Tang, Zheng, Sun, Xiaofan, Li, Dong, Cai, Hong-Ling, Wu, X. S
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 20.01.2022
• Subjects: Crystal structure; Crystals; Dielectrics; Metal compounds; Organic salts; Phase transitions; Transition temperature
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/d1nr04851a

Solid-state crystals with two distinct dielectric states can be a physical practice in binary-based technologies. A large dielectric switch effect up to 10 3 caused by an order-disorder structural phase transition is found in cyclopropylamine perchlorate (CPA-ClO 4 ) crystals at temperatures around 230 K ( T c ) and 220 K ( T ′ c ). Large dielectric switch effects here can be compared to that of the famous ceramic oxide dielectrics. As far as we know, this is the highest dielectric switch effect in simple organic salt crystals and organic-metal compounds so far. If the phase transition temperature can be adjusted by molecular manipulation, one of the most promising candidates for technological applications may emerge in the future. A large dielectric switch effect up to 10 3 caused by an order-disorder structural phase transition is found in cyclopropylamine perchlorate (CPA-ClO 4 ) crystals at around 230 K ( T c ) and 220 K ( T ′ c ).