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  • 1
    Electronic Resource
    Electronic Resource
    Complex Impedance Spectroscopy of Bi-Substituted Yttrium Iron Garnet (YIG) (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 709-711 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effects of Bi-substitution on the complex impedance spectra of yttrium iron garnet (YIG)were studied in this paper. The polycrystalline yttrium iron garnet Y2BiFe5O12 (YIG: Bi) and Y3Fe5O12(YIG) samples were prepared by solid-reaction method. The complex impedance spectra were measuredin the frequency range from 1 KHz to 100MHz at several temperatures between 210oC and 500oC. Thecomplex impedance sample shows that the YIG: Bi can be represented by double Cole-Cole semicircles,and the YIG can be represented by a single Cole semicircle. The physical structure of the specimen wasvisualized as comprising of small resistance grains separated by large resistance grain boundaries inaccordance with the impedance spectra observations. The electrical processes in the sample weremodeled in the form of an electrical equivalent circuit made up of a series combination of two parallel RCcircuits attributed to grains and grain boundaries. The temperature dependence of bulk resistanceindicated an evidence of Arrhenius-type thermally activated process, showing a close to linear variationup to a temperature of 740 K
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.709.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and Magnetic Properties of Low Temperature Sintering Bi-Substituted Yttrium Iron Garnet (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 481-484 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The low temperature sinterability and magnetic properties of Bi-substituted yttrium iron garnet (YIG) polycrystalline samples were studied in this paper. The results showed that Bi-substitution can lower garnet phase formation temperature from about 1200oC to 900oC and ceramic sintering temperature from over 1300oC to about 1050oC respectively. The Bi-substitution leads to a decrease in initial permeability and an increase in ferromagnetic resonance linewidth (ΔH)of sintered specimens. Saturation magnetization decreases and coercive force increases a few with an increase of Bi content. The mechanism of Bi-substitution on initial permeability and ΔH is discussed. The change in initial permeability of Bi-substituted specimens relative to unsubstituted YIG results from Bismuth volatilization and weakening of superexchange interaction. The lattice dilatation inBi-substituted YIG gives cause for a decrease of saturation magnetization and an increase of coactivity force
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.481.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Complex Permeability Spectra of Co-Substituted Lithium Zinc Perminvar Ferrite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 591-593 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of Co-substitution on the complex permeability of LiZn ferrite was studied. Thepolycrystalline ferrite samples with a composition of ((Li0.5Fe0.5)0.8Zn0.2)1-xCoxFe2.05O4, where x variesfrom 0 to 0.08, were prepared by solid-reaction method. The sintered samples were annealed at 490oC for96 h to produce perminvar effect. The complex permeability was measured in the frequency range from 1MHz to 2 GHz. The Co-substitution can enhance the real part of complex permeability (μ’). Themaximum μ’ appears when x=0.02. The Co-substituted LiZn samples, especially for x=0.02 and 0.04,present resonance-type magnetic spectra obviously. The μ’ of the sample for x=0.02 increases because thedamping of domain wall movement decreases after the annealing treatment. The resonance character ofthe annealed sample becomes even more remarkable due to its domain wall stabilization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.591.pdf
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    Paper (German National Licenses)
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