Variable Temperature Behaviour of the Hybrid Double Perovskite MA2KBiCl6

Fengxia Wei; Yue Wu; Shijing Sun; Zeyu Deng; Li Tian Chew; Baisong Cheng; Cheng Cheh Tan; Timothy J White; Anthony K Cheetham

doi:10.3390/molecules28010174

Variable Temperature Behaviour of the Hybrid Double Perovskite MA₂KBiCl₆

Molecules. 2022 Dec 25;28(1):174. doi: 10.3390/molecules28010174.

Authors

Fengxia Wei¹, Yue Wu², Shijing Sun³, Zeyu Deng⁴, Li Tian Chew¹, Baisong Cheng¹, Cheng Cheh Tan¹, Timothy J White⁵, Anthony K Cheetham^{4

6}

Affiliations

¹ Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, Singapore 138634, Singapore.
² Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
³ Energy and Materials Division, Toyota Research Institute, California, CA 94022, USA.
⁴ Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore.
⁵ School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
⁶ Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA.

Abstract

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.

Keywords: Pb-free; hybrid halide perovskite; phase transition.

Grants and funding

C210112054/Agency for Science, Technology and Research