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Title: Nd–Co substituted strontium hexaferrite powders with enhanced coercivity

Abstract

Graphical abstract: Display Omitted Highlights: ► Sr{sub 1−x}Nd{sub x}Fe{sub 11−x}Co{sub x}O{sub 19} was prepared by sol–gel auto-combustion method with 0 ≤ x ≤ 0.4. ► Coercivity increases 11% with 0.2 Nd–Co substitution, reaching a value of 68.9 A/m. ► The appearance of two magnetic orderings is noticed in susceptibility measurements. ► This is supported by Curie temperature and susceptibility data. -- Abstract: In this work we report the synthesis of Nd–Co substituted strontium hexaferrites of composition Sr{sub 1−x}Nd{sub x}Fe{sub 11−x}Co{sub x}O{sub 19} by the sol–gel auto-combustion method with further heat treatment. The analysis of the X-ray diffraction spectra shows the M-type hexagonal structure in samples treated at 1100 °C for 2 h. Coercivity increases 11% with 0.2 Nd–Co substitution, reaching a value of 68.9 A/m (5480 Oe) while saturation magnetization is reduced 6% to 91 A m{sup 2}/kg (91 emu/g). The behavior of magnetic susceptibility with an applied field shows two different maxima which are assigned to different magnetic orderings. This assumption is supported by the appearance of two experimental values of Curie temperatures (T{sub C}) for all the prepared samples. Magnetic susceptibility χ and T{sub C} measurements suggest an uneven distribution of the iron vacancies.

Authors:
 [1];  [2];  [1]
  1. Facultad de Ingeniería, Universidad de Buenos Aires, LAFMACEL-INTECIN, Paseo Colón 850, 1063 Buenos Aires (Argentina)
  2. Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba, IFEG, CONICET, Ciudad Universitaria, 5000 Córdoba (Argentina)
Publication Date:
OSTI Identifier:
22215633
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 47; Journal Issue: 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COERCIVE FORCE; FERRITES; HEAT TREATMENTS; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; POWDERS; X-RAY DIFFRACTION

Citation Formats

Herme, C.A., Bercoff, P.G., E-mail: bercoff@famaf.unc.edu.ar, and Jacobo, S.E. Nd–Co substituted strontium hexaferrite powders with enhanced coercivity. United States: N. p., 2012. Web. doi:10.1016/J.MATERRESBULL.2012.08.047.
Herme, C.A., Bercoff, P.G., E-mail: bercoff@famaf.unc.edu.ar, & Jacobo, S.E. Nd–Co substituted strontium hexaferrite powders with enhanced coercivity. United States. doi:10.1016/J.MATERRESBULL.2012.08.047.
Herme, C.A., Bercoff, P.G., E-mail: bercoff@famaf.unc.edu.ar, and Jacobo, S.E. Thu . "Nd–Co substituted strontium hexaferrite powders with enhanced coercivity". United States. doi:10.1016/J.MATERRESBULL.2012.08.047.
@article{osti_22215633,
title = {Nd–Co substituted strontium hexaferrite powders with enhanced coercivity},
author = {Herme, C.A. and Bercoff, P.G., E-mail: bercoff@famaf.unc.edu.ar and Jacobo, S.E.},
abstractNote = {Graphical abstract: Display Omitted Highlights: ► Sr{sub 1−x}Nd{sub x}Fe{sub 11−x}Co{sub x}O{sub 19} was prepared by sol–gel auto-combustion method with 0 ≤ x ≤ 0.4. ► Coercivity increases 11% with 0.2 Nd–Co substitution, reaching a value of 68.9 A/m. ► The appearance of two magnetic orderings is noticed in susceptibility measurements. ► This is supported by Curie temperature and susceptibility data. -- Abstract: In this work we report the synthesis of Nd–Co substituted strontium hexaferrites of composition Sr{sub 1−x}Nd{sub x}Fe{sub 11−x}Co{sub x}O{sub 19} by the sol–gel auto-combustion method with further heat treatment. The analysis of the X-ray diffraction spectra shows the M-type hexagonal structure in samples treated at 1100 °C for 2 h. Coercivity increases 11% with 0.2 Nd–Co substitution, reaching a value of 68.9 A/m (5480 Oe) while saturation magnetization is reduced 6% to 91 A m{sup 2}/kg (91 emu/g). The behavior of magnetic susceptibility with an applied field shows two different maxima which are assigned to different magnetic orderings. This assumption is supported by the appearance of two experimental values of Curie temperatures (T{sub C}) for all the prepared samples. Magnetic susceptibility χ and T{sub C} measurements suggest an uneven distribution of the iron vacancies.},
doi = {10.1016/J.MATERRESBULL.2012.08.047},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 47,
place = {United States},
year = {2012},
month = {11}
}