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

Journal Article · Wed Apr 15 00:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.01.014· OSTI ID:22475740

Cristóbal, A. A.; Botta, P. M. ^[1]; Ramos, C. P. ^[2]

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1. Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CONICET-UNMdP, Av. J.B. Justo 4302, B7608FDQ Mar del Plata (Argentina)
2. CONICET and Centro Atómico Constituyentes (CAC), CNEA, Av. Gral. Paz 1499, 1650 San Martín (Argentina)

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 elimination of the superparamagnetic behavior and the formation of Y{sub 3}Fe{sub 5}O{sub 12} impurities.

• OSTI ID: 22475740
• Journal Information: Materials Research Bulletin, Vol. 64; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

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