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Synthesis of 4H-SrMnO3.0 nanoparticles from a molecular precursor and their topotactic reduction pathway identified at atomic scale

AuthorsTorres-Pardo, Almudena; García-Hernández, M. ; González-Calbet, José M.; Varela, Áurea
Issue Date2014
PublisherAmerican Chemical Society
CitationChemistry of Materials 26(7): 2256-2265 (2014)
AbstractStoichiometric 4H-SrMnO3.0 nanoparticles have been synthesized from thermal decomposition of a new molecular heterometallic precursor [SrMn(edta)(H2O)5]·3/2H 2O whose crystal structure has been solved by single crystal X-ray diffraction. From this precursor, highly homogeneous 4H-SrMnO3.0 nanoparticles, with average particle size of 70 nm, are obtained. The agglomeration of these nanoparticles maintains the sheet-assembling morphology of the metal-organic compound. Local structural information, provided by atomically resolved microscopy techniques, shows that 4H-SrMnO3.0 nanoparticles exhibit the same general structural features as the bulk material, although structural disorder, due to edge dislocations, is observed. The nanometric particle size enables a topotactic reduction process at low temperature stabilizing a metastable 4H-SrMnO2.82 phase. The oxygen deficiency is accommodated through extra cubic layers breaking the...chch... 4H-sequence. These defect areas are Mn3+ rich, as evidenced by high energy resolution EELS data. Magnetic characterization of nano-SrMnO 3.0 shows significant variations with respect to the bulk material. Besides the dominant antiferromagnetic interactions, a weak ferromagnetic contribution as well as exchange bias and a glassy-like component are present. After the reduction process, the stabilization of Mn3+ in the 4H-structure gives rise to magnetic anomalies in the 40-60 K temperature range. The origin of such magnetic features is discussed. © 2014 American Chemical Society.
Identifiersdoi: 10.1021/cm500068y
e-issn: 1520-5002
issn: 0897-4756
Appears in Collections:(ICMM) Artículos
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