[C5H12N]CdCl3: an ABX3 perovskite-type semiconducting switchable dielectric phase transition material. Issue 9 (27th July 2017)

• Record Type: Journal Article
• Authors: Zeb, Aurang; Sun, Zhihua; Khan, Tariq; Asghar, Muhammad Adnan; Wu, Zhenyue; Li, Lina; Ji, Chengmin; Luo, Junhua
• Is Part Of: Inorganic chemistry frontiers. Volume 4:Issue 9(2017)
• Page Start: 1485
• Page End: 1492
• Publication Date: 2017-07-27
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7qi00301c
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : We report a new lead-free ABX3 perovskite-type hybrid, which displays high thermal stability, semiconducting and striking switchable dielectric properties. Abstract : A new organic–inorganic ABX3 perovskite-type semiconducting hybrid, N -methylpyrrolidinium trichlorocadmate (MPCC ), has been synthesized. It is found thatMPCC exhibits semiconducting behaviour with an optical bandgap of ∼4.65 eV, as well as remarkable dielectric switching properties. It displays a structural phase transition (SPT) at T c = 254 K, being confirmed by DSC and specific heat measurements. Dielectric measurements display distinct step-like anomalies around T c, suggestingMPCC as a switchable dielectric material. Variable temperature single-crystal X-ray diffraction reveals that symmetry-breaking occurs from Pnma (at 280 K, > T c ) to P 21 / c (at 230 K, < T c ), which is attributed to the ordering of the disordered N -methylpyrrolidinium (MP) cation. The most distinct difference between its low- and high-temperature structures is the order–disorder dynamics of the MP cation, which mainly contribute to the SPT and switchable dielectric activities ofMPCC . This finding paves a new way for designing multi-featured ABX3 -type SPT hybrids by choosing disordered cationic moieties.