Neue ergebnisse &amp;#252;ber den einfl&amp;#252;ss der sinterbedingungen auf die eigenschaften von Mn-Zn-Ferriten

Beer, Andreas; Schwarz, Jiří

doi:10.1109/tmag.1966.1065952

Cited by 32 publications

(5 citation statements)

References 3 publications

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“…Transition temperatures (T C ) estimated from permeability versus temperature curves are found to decrease almost linearly with increasing Al content and may be attributed to the decrease of A-B exchange interaction since Al is found to occupy octahedral or B sublattice which is confirmed by our previous neutron data [10]. The values of T C obtained from the permeability spectra are compared with those obtained from the neutron diffraction data and magnetization measurements [13,14] in Table 2.…”

Section: Resultssupporting

confidence: 57%

“…Many experimental and theoretical investigations on the frequency dispersion in polycrystalline ferrite have been performed [3][4][5][6][7][8]. The results of these investigations show much variations because of the subtle dependence of initial permeability on sintering temperature which affects the grain size, density and presence of voids in the polycrystalline specimens [9][10][11]. The permeability of polycrystalline ferrites is guided by two basic mechanisms such as domain rotation and domain wall movement and in the case of frequency response spin resonance it plays an important role [1,7].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Substitution of Al for Fe on the Magnetic Phase Transition and Initial Permeability of Zn-Co Ferrites

Zakaria

Hakim

Asgar

1970

J Bangladesh Acad Sci

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The spinel oxides Zn 0.4 Co 0.6 Al x Fe 2-x O 4 (x=0.0, 0.25, 0.50, 0.75 & 1.0) have been synthesized in the solid state sintering process in air. X-ray diffraction measurements have been carried out in order to check the phase which showed single phase spinel structure for all the samples. Initial permeability, frequency dependence of the complex permeability sintered at different temperatures has been measured on toroidal samples in the frequency range 1-500 KHz at room temperature. Temperature dependence of the complex permeability has been measured from room temperature to 435°C. Transition temperatures (T C ) have been estimated from the temperature dependence of the permeability spectra for all the samples. It is found that the values of transition temperatures (T C ) and initial permeability (m i ) decrease with increasing substitution of Al content in the system. The values of T C obtained from permeability spectra are compared with those obtained from neutron diffraction data and magnetization measurements.

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Section: Resultssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Effect of Substitution of Al for Fe on the Magnetic Phase Transition and Initial Permeability of Zn-Co Ferrites

Zakaria

Hakim

Asgar

1970

J Bangladesh Acad Sci

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“…The abrupt weight change is presumably due to the reduction reaction as described in Eq. (3). It should be noted that the abrupt weight change (%) at 1100°C is greater than at 1200°a nd 1300°C.…”

Section: Resultsmentioning

confidence: 87%

“…2 Zinc vaporization has been recognized as troublesome during sintering of Mn-Zn ferrites, because ZnO is easily reduced and evaporates. 3 Slick and Basseches 4 reported that zinc vaporization is significant at low oxygen activities under high temperature. The reduction reaction and mass action expression of the zinc vaporization can be written as 5 ZnO ϭ Zn͑ g͒ ϩ…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Zinc Vaporization from Manganese Zinc Ferrites

Suh

Han

2003

Journal of the American Ceramic Society

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Zinc vaporization of Mn-Zn ferrites was quantitatively characterized in terms of oxygen partial pressure P O 2 , temperature, grain size and sample geometry. The amount of zinc loss was measured as a function of time at various temperatures by a thermogravimetric method. The weight loss due to irreversible zinc vaporization showed a linear behavior with time and increased exponentially with temperature. The observed weight loss due to zinc evaporation at 1100°C was small, whereas a significant weight change was detected at 1200°C. The weight loss was even greater in a reducing atmosphere (P O 2 ‫؍‬ 5 ؋ 10 ؊5 ). Below 1300°C, the diffusion of elemental zinc was sufficiently fast to compensate the zinc loss at the interface region, resulting in a linear dependence on time. At temperatures >1400°C, the weight change no longer followed the linear dependence and showed a rather parabolic behavior with a concave upward slope. The core shape and the gas flow around ferrite cores were important factors that affected the rate of zinc vaporization, but not the grain size. Fig. 7. Weight loss per hour (%) as a function of specific surface area for toroidal and cylindrical ferrite cores.

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“…8, causes the grain growth observed at higher temperature. It is also observed that the increase in zinc content increases the grain size [41] and density [28], and decreases the anisotropy [42], which results in an increase in the value of initial permeability. It is well known that the initial permeability characteristics depend not only on chemical composition but also on the microstructure of the sintered body.…”

Section: Lattice Parameter Bulk Density and Porosity Of The Ni 1-x Zmentioning

confidence: 99%

Magnetic properties of Ni-Zn ferrites prepared by microwave sintering method

et al. 2011

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The effect of zinc ion substitution for nickel on structural and magnetic properties of NiZn ferrites is reported. The spinel ferrite system Ni 1-x Zn x Fe 2 O 4 with x0 0.2, 0.3, 0.4 and 0.5 was prepared by microwave sintering method. The uniaxially pressed samples were sintered at various temperatures such as 900°C, 1000°C and 1100°C for 30 min. X-ray diffraction patterns of the samples indicate the formation of single-phase cubic spinel structure. SEM micrographs show that grain size increases with increasing zinc content and sintering temperature. The elemental composition of these ferrites was analyzed by EDS. Lattice constant increases with increase in zinc content, obeying Vegard's law. The effect of composition and sintering temperature on initial permeability as the function of frequency and temperature was studied. The initial permeability of NiZn ferrite increases greatly with increasing Zn content and sintering temperature. The dependence of initial permeability with respect to temperature shows the decrease in the Curie point with increase in zinc content, is the normal behavior of ferrites. The relative loss factor ðtan d μ i = Þ of the order of 10 −2 to 10 −5 in the frequency range from 100 Hz to 1 MHz indicates that the prepared ferrites have relatively high purity.

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Neue ergebnisse über den einflüss der sinterbedingungen auf die eigenschaften von Mn-Zn-Ferriten

Cited by 32 publications

References 3 publications

Effect of Substitution of Al for Fe on the Magnetic Phase Transition and Initial Permeability of Zn-Co Ferrites

Effect of Substitution of Al for Fe on the Magnetic Phase Transition and Initial Permeability of Zn-Co Ferrites

Quantitative Analysis of Zinc Vaporization from Manganese Zinc Ferrites

Magnetic properties of Ni-Zn ferrites prepared by microwave sintering method

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