Intercalation-driven ferroelectric-to-ferroelastic conversion in a layered hybrid perovskite crystal

Z. Wu, S. Li, Y. M. Yousry, W. P. D. Wong, X. Wang, T. Ma, Z. Chen, Y. Shao, W. H. Liew, K. Yao, F. Pan, K. P. Loh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

21 Citations (Scopus)


Two-dimensional (2D) organic-inorganic hybrid perovskites have attracted intense interests due to their quantum well structure and tunable excitonic properties. As an alternative to the well-studied divalent metal hybrid perovskite based on Pb(2+), Sn(2+) and Cu(2+), the trivalent metal-based (eg. Sb(3+) with ns2 outer-shell electronic configuration) hybrid perovskite with the A3M2X9 formula (A = monovalent cations, M = trivalent metal, X = halide) offer intriguing possibilities for engineering ferroic properties. Here, we synthesized 2D ferroelectric hybrid perovskite (TMA)3Sb2Cl9 with measurable in-plane and out-of-plane polarization. Interestingly, (TMA)3Sb2Cl9 can be intercalated with FeCl4 ions to form a ferroelastic and piezoelectric single crystal, (TMA)4-Fe(iii)Cl4-Sb2Cl9. Density functional theory calculations were carried out to investigate the unusual mechanism of ferroelectric-ferroelastic crossover in these crystals.
Original languageEnglish
Article number3104
JournalNature Communications
Issue number1
Publication statusPublished - Jun 2022


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