Variable temperature behaviour of the hybrid double perovskite MA₂KBiCl₆

• Main Authors: Wei, Fengxia, Wu, Yue, Sun, Shijing, Deng, Zeyu, Chew, Li Tian, Cheng, Baisong, Tan, Cheng Cheh, White, Timothy John, Cheetham, Anthony K.
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2023
• Subjects: Engineering::Materials; Hybrid Halide Perovskite; Phase Transition
• Online Access: https://hdl.handle.net/10356/169457
• Institution: Nanyang Technological University

Perovskite-related materials show very promising properties in many fields. Pb-free perovskites are particularly interesting, because of the toxicity of Pb. In this study, hybrid double perovskite MA2KBiCl6 (MA = methylammonium cation) was found to have interesting variable temperature behaviours. Both variable temperature single crystal X-ray diffraction, synchrotron powder diffraction, and Raman spectroscopy were conducted to reveal a rhombohedral to cubic phase transition at around 330 K and an order to disorder transition for inorganic cage below 210 K.