An Unusual Phase Transition Driven by Vibrational Entropy Changes in a Hybrid Organic–Inorganic Perovskite

Wenjuan Wei, Wei Li, Keith T. Butler, Guoqiang Feng, Christopher J. Howard, Michael A. Carpenter, Peixiang Lu, Aron Walsh, Anthony K. Cheetham

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The driving forces for the phase transitions of ABX3 hybrid organic–inorganic perovskites have been limited to the octahedral tilting, order–disorder, and displacement. Now, a complex structural phase transition has been explored in a HOIP, [CH3NH3][Mn(N3)3], based on structural characterizations and ab initio lattice dynamics calculations. This unusual first-order phase transition between two ordered phases at about 265 K is primarily driven by changes in the collective atomic vibrations of the whole lattice, along with concurrent molecular displacements and an unusual octahedral tilting. A significant entropy difference (4.35 J K−1 mol−1) is observed between the low- and high-temperature structures induced by such atomic vibrations, which plays a main role in driving the transition. This finding offers an alternative pathway for designing new ferroic phase transitions and related physical properties in HOIPs and other hybrid crystals.

Original languageEnglish
Pages (from-to)8932-8936
Number of pages5
JournalAngewandte Chemie - International Edition
Volume57
Issue number29
DOIs
Publication statusPublished - 2018 Jul 16

Bibliographical note

Funding Information:
The authors acknowledge the funding support from the National Natural Science Foundation of China (Grant no.

Funding Information:
21571072). W.W., G.F., W.L. and P.L. thank the Fundamental Research Funds for the Central Universities, HUST (Grant no. 2017KFXKJC002). W.L. is grateful to Prof. Song Gao for his illuminating suggestions.

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Fingerprint Dive into the research topics of 'An Unusual Phase Transition Driven by Vibrational Entropy Changes in a Hybrid Organic–Inorganic Perovskite'. Together they form a unique fingerprint.

Cite this