Structural transition and thermochromic study of faceted hexagonal prisms and nanoparticles of 4H-SrMnO3.0 with different morphologies
4H-SrMnO3 bulk material presents a colour transition at temperature close to 140 K, the origin of such colour transition remains unknown. Besides, the influence of the morphology and particle size in the optical properties of this material has not been investigated yet. We have prepared nanoparticles and faceted microcrystals of 4H-SrMnO3. Whereas the former undergoes a similar colour transition than bulk material, the latter does not manifest it. Our results from ED and Raman show a structural change from hexagonal to orthorhombic symmetry at temperature < 170 K. DSC analysis reveals a second structural transition at around 275 K. These results show the complex structural behaviour of this system when morphology and particle size are involved; a detailed structural study as a function of temperature is mandatory in order to establish whether the optical properties are associated or not to the structural ones. It is worth stressing for the first time 4H-SrMnO3 nanoparticles have been isolated showing significant variations in their magnetic behaviour when compared to bulk material.A complete characterization of this sample is required to understand this complex behaviour.
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VARELA Aurea; CLIMENT PASCUAL Esteban; FERNANDEZ DIAZ Maria Teresa; GONZALEZ Irma Noemi; HERNANDO GONZALEZ Maria; MAZARIO FERNANDEZ Angel and PARRAS Marina. (2014). Structural transition and thermochromic study of faceted hexagonal prisms and nanoparticles of 4H-SrMnO3.0 with different morphologies. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-549
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