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Title: Effect of lanthanide on the microstructure and structure of LnMn{sub 0.5}Fe{sub 0.5}O{sub 3} nanoparticles with Ln=La, Pr, Nd, Sm and Gd prepared by the polymer precursor method

The synthesis of LnMn{sub 0.5}Fe{sub 0.5}O{sub 3} perovskite nanoparticles by the polymer precursor method showed a strong intrinsic dependence with different lanthanides (Ln=La, Pr, Nd, Sm and Gd). The polymerization level reached in the polymer precursor was proportional to the atomic number of lanthanide with exception of samarium, which showed the formation of a different precursor based in a citrate chelate with ethyleneglycol bonded as adduct. The increasing level of polymerization of the polymer precursors showed the formation of large-size perovskite nanoparticles after its calcination. SAXS and TEM analyses suggested that nanoparticles obtained, using this method, have a squared-like microstructure in connection with the polymer precursor microstructure. Structural analysis showed an orthorhombic structure with a slight decline in the Jahn–Teller distortion when the atomic number of lanthanide increases. Mössbauer spectroscopy showed the presence of a majority site in agreement with the Pbnm orthorhombic structure best fitted with Rietveld refinements and in some cases, a more distorted site attributed to local inhomogeneities and oxygen vacancies. - Highlights: • Precursor polymerization level is lower in the presence of lighter lanthanides. • Lighter lanthanide perovskite nanoparticles after calcination are lower-sized. • Nanoparticles obtained by this method have lamellae microstructure. • Jahn–Teller distortion declinesmore » for heavier lanthanide perovskites. • Oxygen vacancy phase was observed in lighter lanthanide perovskites.« less
Authors:
 [1] ;  [2] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ; ;  [1] ;  [2] ; ;  [5] ;
  1. Centro NanoMat/Cryssmat Lab/Cátedra de Física—DETEMA, Facultad de Química—UdelaR, Montevideo (Uruguay)
  2. (Uruguay)
  3. Departamento de Física de La Plata, Universidad Nacional de La Plata, La Plata (Argentina)
  4. (Argentina)
  5. Laboratorio Central de microscopía electrónica, Universidad Federal de Santa Catarina, Florianópolis (Brazil)
Publication Date:
OSTI Identifier:
22443515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 221; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CALCINATION; CHELATES; CITRATES; LAMELLAE; MICROSTRUCTURE; NANOPARTICLES; ORTHORHOMBIC LATTICES; OXYGEN; PEROVSKITE; POLYMERIZATION; POLYMERS; PRECURSOR; SAMARIUM; SMALL ANGLE SCATTERING; SPECTROSCOPY; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION