Structural and magnetic properties of barium hexaferrites with Gd-Co substitution

G. Litsardakis; I. Manolakis; K. Efthimiadis

doi:10.1016/j.jallcom.2006.02.044

Structural and magnetic properties of barium hexaferrites with Gd-Co substitution

G. Litsardakis, I. Manolakis, K. Efthimiadis

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

Abstract

A first examination concerning possible replacement of La by Gd in Ba-La-Co hexaferrites has been conducted. Substituted samples according to the formula Ba_1-xGd_xFe_12-xCo_xO₁₉ (x = 0.0, 0.1, 0.2, 0.3, 0.4) were prepared by classical ceramic route. A La-Co substituted sample with composition Ba_0.8La_0.2Fe_11.8Co_0.2O₁₉, (x = 0.2) was also prepared for comparison. The structural and magnetic characteristics have been studied by XRD, VSM, SEM and EDX techniques. The substituted samples contain small amount of α-Fe₂O₃ impurities and traces of CoFe₂O₄, Fe₂GdO₄ and GdFeO₃. The coercivity of samples with x = 0.1-0.2 is higher up to 15% than in BaFe₁₂O₁₉, while the saturation magnetization and remanence values are lower. The Ba_0.9Gd_0.1Fe_11.9Co_0.1O₁₉ sample (x = 0.1) presents similar values of H_c and σ_r to the La-Co (x = 0.2) sample Ba_0.8La_0.2Fe_11.8Co_0.2O₁₉, demonstrating the potential for use of Gd in rare-earth substituted hexaferrite permanent magnet materials.

Original language	English
Pages (from-to)	194-198
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	427
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2006.02.044
Publication status	Published - 16 Jan 2007
Externally published	Yes

Keywords

Magnetic measurements
Permanent magnets
X-ray diffraction

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10.1016/j.jallcom.2006.02.044

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@article{0d8c756ee4c7463baee4ff8c93b1bdd5,

title = "Structural and magnetic properties of barium hexaferrites with Gd-Co substitution",

abstract = "A first examination concerning possible replacement of La by Gd in Ba-La-Co hexaferrites has been conducted. Substituted samples according to the formula Ba1-xGdxFe12-xCoxO19 (x = 0.0, 0.1, 0.2, 0.3, 0.4) were prepared by classical ceramic route. A La-Co substituted sample with composition Ba0.8La0.2Fe11.8Co0.2O19, (x = 0.2) was also prepared for comparison. The structural and magnetic characteristics have been studied by XRD, VSM, SEM and EDX techniques. The substituted samples contain small amount of α-Fe2O3 impurities and traces of CoFe2O4, Fe2GdO4 and GdFeO3. The coercivity of samples with x = 0.1-0.2 is higher up to 15% than in BaFe12O19, while the saturation magnetization and remanence values are lower. The Ba0.9Gd0.1Fe11.9Co0.1O19 sample (x = 0.1) presents similar values of Hc and σr to the La-Co (x = 0.2) sample Ba0.8La0.2Fe11.8Co0.2O19, demonstrating the potential for use of Gd in rare-earth substituted hexaferrite permanent magnet materials.",

keywords = "Magnetic measurements, Permanent magnets, X-ray diffraction",

author = "G. Litsardakis and I. Manolakis and K. Efthimiadis",

year = "2007",

month = jan,

day = "16",

doi = "10.1016/j.jallcom.2006.02.044",

language = "English",

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journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Structural and magnetic properties of barium hexaferrites with Gd-Co substitution

AU - Litsardakis, G.

AU - Manolakis, I.

AU - Efthimiadis, K.

PY - 2007/1/16

Y1 - 2007/1/16

N2 - A first examination concerning possible replacement of La by Gd in Ba-La-Co hexaferrites has been conducted. Substituted samples according to the formula Ba1-xGdxFe12-xCoxO19 (x = 0.0, 0.1, 0.2, 0.3, 0.4) were prepared by classical ceramic route. A La-Co substituted sample with composition Ba0.8La0.2Fe11.8Co0.2O19, (x = 0.2) was also prepared for comparison. The structural and magnetic characteristics have been studied by XRD, VSM, SEM and EDX techniques. The substituted samples contain small amount of α-Fe2O3 impurities and traces of CoFe2O4, Fe2GdO4 and GdFeO3. The coercivity of samples with x = 0.1-0.2 is higher up to 15% than in BaFe12O19, while the saturation magnetization and remanence values are lower. The Ba0.9Gd0.1Fe11.9Co0.1O19 sample (x = 0.1) presents similar values of Hc and σr to the La-Co (x = 0.2) sample Ba0.8La0.2Fe11.8Co0.2O19, demonstrating the potential for use of Gd in rare-earth substituted hexaferrite permanent magnet materials.

AB - A first examination concerning possible replacement of La by Gd in Ba-La-Co hexaferrites has been conducted. Substituted samples according to the formula Ba1-xGdxFe12-xCoxO19 (x = 0.0, 0.1, 0.2, 0.3, 0.4) were prepared by classical ceramic route. A La-Co substituted sample with composition Ba0.8La0.2Fe11.8Co0.2O19, (x = 0.2) was also prepared for comparison. The structural and magnetic characteristics have been studied by XRD, VSM, SEM and EDX techniques. The substituted samples contain small amount of α-Fe2O3 impurities and traces of CoFe2O4, Fe2GdO4 and GdFeO3. The coercivity of samples with x = 0.1-0.2 is higher up to 15% than in BaFe12O19, while the saturation magnetization and remanence values are lower. The Ba0.9Gd0.1Fe11.9Co0.1O19 sample (x = 0.1) presents similar values of Hc and σr to the La-Co (x = 0.2) sample Ba0.8La0.2Fe11.8Co0.2O19, demonstrating the potential for use of Gd in rare-earth substituted hexaferrite permanent magnet materials.

KW - Magnetic measurements

KW - Permanent magnets

KW - X-ray diffraction

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -

Structural and magnetic properties of barium hexaferrites with Gd-Co substitution

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