Uniaxial negative thermal expansion in the [(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]PbBr<sub>3</sub> 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 Sánchez‐Andújar, Alejandro Pedro Ayala, C. W. A. Paschoal
Abstract
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.
Topics & Concepts
Perovskite (structure)Thermal expansionMaterials scienceNegative thermal expansionThermalCrystallographyCondensed matter physicsComposite materialThermodynamicsChemistryPhysicsThermal Expansion and Ionic ConductivityPerovskite Materials and ApplicationsSolid-state spectroscopy and crystallography