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Title

SrMnO3 thermochromic behavior governed by size-dependent structural distortions

AuthorsGonzález-Jiménez, Irma N.; Climent-Pascual, Esteban CSIC ORCID; Torres-Pardo, Almudena; Hernando, María; Sánchez-Peláez, Ana E.; Fernández-Martínez, Francisco; Fernández Díaz, M. T.eresa; González-Calbet, José M.; Andrés, Alicia de CSIC ORCID; Varela, Áurea; Parras, Marina
Issue Date18-Apr-2016
PublisherAmerican Chemical Society
CitationInorganic Chemistry 55(8): 3980-3991 (2016)
AbstractThe influence of particle size in both the structure and thermochromic behavior of 4H-SrMnO related perovskite is described. Microsized SrMnO suffers a structural transition from hexagonal (P6/mmc) to orthorhombic (C222) symmetry at temperature close to 340 K. The orthorhombic distortion is due to the tilting of the corner-sharing MnO units building the 4H structural type. When temperature decreases, the distortion becomes sharper reaching its maximal degree at ∼125 K. These structural changes promote the modification of the electronic structure of orthorhombic SrMnO phase originating the observed color change. nano-SrMnO adopts the ideal 4H hexagonal structure at room temperature, the orthorhombic distortion being only detected at temperature below 170 K. A decrease in the orthorhombic distortion degree, compared to that observed in the microsample, may be the reason why a color change is not observed at low temperature (77 K).
Publisher version (URL)https://doi.org/10.1021/acs.inorgchem.6b00193
URIhttp://hdl.handle.net/10261/186261
DOI10.1021/acs.inorgchem.6b00193
Identifiersdoi: 10.1021/acs.inorgchem.6b00193
e-issn: 1520-510X
issn: 0020-1669
Appears in Collections:(ICMM) Artículos

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