Uniaxial negative thermal expansion in the [(CH3)2NH2]PbBr3 hybrid perovskite

• DOI: 10.1039/d2tc02708a
• Publication Date: 2022-10-17T21:01:21Z
• Authors: Juan S. Rodríguez...; Mayra A. P. Gómez; D. S. Abreu; Ariel Nonato; Rosivaldo Xavier ...; Alberto García-Fe...; María A. Señarís-...; Manuel Sánchez-An...; A. P. Ayala; C. W. A. Paschoal
• Keywords: 01 natural sciences; 0104 chemical sciences

The [(CH3)2NH2]PbBr3 perovskite exhibits an unusual thermal expansion, and we propose a novel thermomechanical mechanism that differs from the typical “wine-rack”. Also, we probed the presence of an H-bond between the DMA cation and the framework.