Effects of Gd substitution on the structural and magnetic properties of strontium hexaferrites

G. Litsardakis; I. Manolakis; C. Serletis; K. G. Efthimiadis

doi:10.1016/j.jmmm.2007.02.046

Effects of Gd substitution on the structural and magnetic properties of strontium hexaferrites

G. Litsardakis, I. Manolakis, C. Serletis, K. G. Efthimiadis

Research output: Contribution to journal › Article › peer-review

Abstract

The effect of Gd substitution in M-type strontium hexaferrites has been examined in two series of samples, (Sr_{1 - x} Gd_x) O · 5.25Fe₂ O₃ and Sr_{1 - x} Gd_x Fe_{12 - x} Co_x O₁₉, both prepared by the ceramic method, where x = 0 - 0.40. The samples have been characterized by XRD, VSM and SEM-EDAX techniques. All substituted samples present primarily the hexaferrite structure. Sample (Sr_0.95 Gd_{x 0.05}) O · 5.25Fe₂ O₃ is single phase. Formation of impurity phases is affected by stoichiometry and presence of Co. In Sr-Gd samples, coercivity showed a maximum value of 305 kA/m (3.8 kOe) for x = 0.20, while remanence and saturation magnetization did not decrease. Coercivity and magnetization in the Sr-Gd-Co series decreased steadily with substitution degree.

Original language	English
Pages (from-to)	170-173
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	316
Issue number	2 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jmmm.2007.02.046
Publication status	Published - Sep 2007
Externally published	Yes

Keywords

M-type hexaferrites
Magnetic properties
Permanent magnets
Rare-earth substitution

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10.1016/j.jmmm.2007.02.046

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title = "Effects of Gd substitution on the structural and magnetic properties of strontium hexaferrites",

abstract = "The effect of Gd substitution in M-type strontium hexaferrites has been examined in two series of samples, (Sr1 - x Gdx) O · 5.25Fe2 O3 and Sr1 - x Gdx Fe12 - x Cox O19, both prepared by the ceramic method, where x = 0 - 0.40. The samples have been characterized by XRD, VSM and SEM-EDAX techniques. All substituted samples present primarily the hexaferrite structure. Sample (Sr0.95 Gdx 0.05) O · 5.25Fe2 O3 is single phase. Formation of impurity phases is affected by stoichiometry and presence of Co. In Sr-Gd samples, coercivity showed a maximum value of 305 kA/m (3.8 kOe) for x = 0.20, while remanence and saturation magnetization did not decrease. Coercivity and magnetization in the Sr-Gd-Co series decreased steadily with substitution degree.",

keywords = "M-type hexaferrites, Magnetic properties, Permanent magnets, Rare-earth substitution",

author = "G. Litsardakis and I. Manolakis and C. Serletis and Efthimiadis, {K. G.}",

year = "2007",

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doi = "10.1016/j.jmmm.2007.02.046",

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journal = "Journal of Magnetism and Magnetic Materials",

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T1 - Effects of Gd substitution on the structural and magnetic properties of strontium hexaferrites

AU - Litsardakis, G.

AU - Manolakis, I.

AU - Serletis, C.

AU - Efthimiadis, K. G.

PY - 2007/9

Y1 - 2007/9

N2 - The effect of Gd substitution in M-type strontium hexaferrites has been examined in two series of samples, (Sr1 - x Gdx) O · 5.25Fe2 O3 and Sr1 - x Gdx Fe12 - x Cox O19, both prepared by the ceramic method, where x = 0 - 0.40. The samples have been characterized by XRD, VSM and SEM-EDAX techniques. All substituted samples present primarily the hexaferrite structure. Sample (Sr0.95 Gdx 0.05) O · 5.25Fe2 O3 is single phase. Formation of impurity phases is affected by stoichiometry and presence of Co. In Sr-Gd samples, coercivity showed a maximum value of 305 kA/m (3.8 kOe) for x = 0.20, while remanence and saturation magnetization did not decrease. Coercivity and magnetization in the Sr-Gd-Co series decreased steadily with substitution degree.

AB - The effect of Gd substitution in M-type strontium hexaferrites has been examined in two series of samples, (Sr1 - x Gdx) O · 5.25Fe2 O3 and Sr1 - x Gdx Fe12 - x Cox O19, both prepared by the ceramic method, where x = 0 - 0.40. The samples have been characterized by XRD, VSM and SEM-EDAX techniques. All substituted samples present primarily the hexaferrite structure. Sample (Sr0.95 Gdx 0.05) O · 5.25Fe2 O3 is single phase. Formation of impurity phases is affected by stoichiometry and presence of Co. In Sr-Gd samples, coercivity showed a maximum value of 305 kA/m (3.8 kOe) for x = 0.20, while remanence and saturation magnetization did not decrease. Coercivity and magnetization in the Sr-Gd-Co series decreased steadily with substitution degree.

KW - M-type hexaferrites

KW - Magnetic properties

KW - Permanent magnets

KW - Rare-earth substitution

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DO - 10.1016/j.jmmm.2007.02.046

M3 - Article

AN - SCOPUS:34250311613

SN - 0304-8853

VL - 316

SP - 170

EP - 173

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2 SPEC. ISS.

ER -

Effects of Gd substitution on the structural and magnetic properties of strontium hexaferrites

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Keywords

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