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Title: Hyperfine and magnetic properties of a Y{sub x}La{sub 1−x}FeO{sub 3} series (0 ≤ x ≤ 1)

Highlights: • Y{sub x}La{sub 1−x}FeO{sub 3} (0 ≤ x ≤ 1) was synthesized by mechanochemistry. • Two magnetic contributions were identified in the series. • A paramagnetic state is associated with a fraction of the smallest particles. • A ferromagnetic state is attributed to the larger particles. • Annealing of samples favored the formation of Y{sub 3}Fe{sub 5}O{sub 12} impurities. - Abstract: A series of orthoferrites Y{sub x}La{sub 1−x}FeO{sub 3} in the entire range of composition was synthesized at room temperature by mechanochemical activation of oxide mixtures. Phase composition, structure and microstructure of the obtained powder materials were characterized by X-ray diffraction and field-emission scanning electron microscopy. Hyperfine interactions and magnetic properties were determined by Mössbauer spectroscopy, SQUID and vibrating sample magnetometry. Two magnetic contributions could be identified in the series of materials: a paramagnetic state, associated with a fraction of the smallest particles and a ferromagnetic state, attributed to the larger particles. The results showed that the relative proportion of both contributions is very dependent on x, the Y content of samples. From M vs T measurements, it was possible to estimate the blocking temperature distribution for the end members of the series. Annealing of samples produced the eliminationmore » of the superparamagnetic behavior and the formation of Y{sub 3}Fe{sub 5}O{sub 12} impurities.« less
Authors:
;  [1] ;  [2] ;  [3]
  1. Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CONICET-UNMdP, Av. J.B. Justo 4302, B7608FDQ Mar del Plata (Argentina)
  2. Facultad de Matemática, Astronomía y Física (FaMAF), Universidad Nacional de Córdoba. IFEG (CONICET), Medina Allende s/n, Ciudad Universitaria, 5000 Córdoba (Argentina)
  3. CONICET and Centro Atómico Constituyentes (CAC), CNEA, Av. Gral. Paz 1499, 1650 San Martín (Argentina)
Publication Date:
OSTI Identifier:
22475740
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 64; Other Information: Copyright (c) 2015 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:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; FERRITES; HYPERFINE STRUCTURE; INTERACTIONS; LANTHANUM COMPOUNDS; MAGNETIC PROPERTIES; MAGNETOMETERS; MICROSTRUCTURE; OXIDES; PARAMAGNETISM; POWDER METALLURGY; SCANNING ELECTRON MICROSCOPY; SPECTROSCOPY; SUPERPARAMAGNETISM; TEMPERATURE DISTRIBUTION; X-RAY DIFFRACTION; YTTRIUM COMPOUNDS