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

Juan S. Rodríguez-Hernández,Mayra A. Padrón Gómez, Dieric S. Abreu, A. Nonato,Rosivaldo Xavier da Silva,Alberto García‐Fernández, M. A. Señarı́s-Rodrı́guez, Manuel Andújar, A. P. Ayala, C. W. A. Paschoal

Journal of Materials Chemistry C（2022）

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摘要

The [(CH 3 ) 2 NH 2 ]PbBr 3 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.

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uniaxial negative thermal expansion

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

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