Effects of sintering temperature on microstructure, initial permeability and electric behaviour of Ni-Mn-Zn ferrites

2021 ◽  
pp. 125250
Author(s):  
U.B. Gawas ◽  
V.M.S. Verenkar ◽  
V.T. Vader ◽  
Anil Jain ◽  
Sher Singh Meena
Keyword(s):  
Sintering Temperature ◽  
Initial Permeability

THE EFFECT OF AMOUNT TANTALUM DOPING ON THE PROPERTIES OF MgCuZn FERRITES

2011 ◽  
Vol 25 (19) ◽  
pp. 2583-2591 ◽  
Author(s):  
A. TAWFIK ◽  
M. Z. SAID ◽  
O. M. HEMEDA
Keyword(s):  
Electrical Resistivity ◽  
Sintered Density ◽  
Sintering Temperature ◽  
Lattice Parameter ◽  
Initial Permeability ◽  
Maximum Density ◽  
Preparation Process ◽  
Iron Ions ◽  
Ceramic Method ◽  
Jump Length

The systems MgCuZn Fe 2 O 4 doped (0–0.6 wt% Ta) are prepared by the general ceramic method using the sintering temperature at 1200°C. The variations of the sintered density, lattice parameter, jump length of electrons, and initial permeability were studied. A maximum density was obtained at 1200°C during the preparation process. The electrical resistivity decreases with increasing tantalum ( Ta ) content upto 0.1 wt% and then increases for higher concentrations. The initial permeability and the change carries mobility increase upto 0.1 Ta and then decreases. The jump length decreases with enhancing Ta ions because the substitution of Ta ion with small size instead of Fe 3+ at the A sites increase the concentration of iron ions at the B sites. The increase of the iron content causes the decrease of the jump length of electrons between Fe 3+ and Fe 2+. These improvements of the magnetic properties give some light about the importance of these compositions to be used in technology.

scholarly journals Effect of Ca-substitution on the Magnetic and Dielectric Properties of Mn-Zn Ferrites

2012 ◽  
Vol 4 (2) ◽  
pp. 297 ◽  
Author(s):  
M. M. Rahman ◽  
P. K. Halder ◽  
F. Ahmed ◽  
T. Hossain ◽  
M. Rahaman
Keyword(s):  
Dielectric Constant ◽  
Curie Temperature ◽  
Loss Tangent ◽  
Sintering Temperature ◽  
Initial Permeability ◽  
Q Factor ◽  
Dielectric Polarization ◽  
Ca Substitution ◽  
Magnetic And Dielectric Properties ◽  
Curie Temperature Tc

Spinel Mn-Zn ferrites with composition MnxZn0.4Ca0.6-2xFe2+xO4, where x = 0.10, 0.15, 0.20, 0.25 and 0.30 have been prepared by conventional ceramic technique sintered at    1300 °C for 4 hours. The influence of Ca-substitution on various properties of Mn-Zn ferrites have been studied in this work. Investigations were carried out by the measurements of Curie temperature, permeability, loss tangent, Q-factor, dielectric constant and AC resistivity of the samples. Curie temperature (Tc), the real part of initial permeability (µ´), loss tangent (tan ?), and AC resistivity have been found to be decreased while the Q-factor increases with the increase in Ca-content. The frequency characteristics of the dielectric constant and AC resistivity have been found to be decreased as the frequency increases. Maxwell-Wagner interfacial type of dielectric polarization was observed with the addition of Ca-content over the entire range of frequency considered. Keywords: Spinel ferrites; Sintering temperature; Initial permeability; Dielectric constant.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i2.9752 J. Sci. Res. 4 (2), 297-306 (2012)

Magnetic Properties of Ni-Zn Ferrite Ceramics Prepared from the Blend of Powders

2005 ◽  
Vol 475-479 ◽  
pp. 2193-2196 ◽  
Author(s):  
Haisheng Zhong ◽  
Qiang Li ◽  
Zhifeng Zhong ◽  
Ming Cheng
Keyword(s):  
Magnetic Properties ◽  
Grain Growth ◽  
Fine Particles ◽  
Sintering Temperature ◽  
Initial Permeability ◽  
Abnormal Grain Growth ◽  
Zn Ferrite ◽  
Low Sintering Temperature ◽  
Ultra Fine Particles

Ni-Zn ferrite ceramics were prepared from the blend of nano-sized powders and ultra-fine particles at the relative low sintering temperature (≤1200°C). The microstructure of the as-sintered samples characterized by SEM indicated that this process obstructed abnormal grain growth which often appeared in the Ni-Zn ferrite ceramics sintered from the nano-sized powders. The result of VSM measurements showed that the ratio of nano-sized powders to ultra-fine particles effected the initial permeability (μi) of the as-sintered samples. Optimum initial permeability can be obtained by adjusting the ratio as 1:1.

scholarly journals Improvement of microstructure and initial permeability of Mn0.5Ni0.1Zn0.4GdxFe2-xO4 with sintering temperature

2021 ◽  
pp. 104157
Author(s):  
M. Nazrul Islam ◽  
Md. Harun-Or-Rashid ◽  
Jakiul Islam ◽  
Roksana Parvin ◽  
A.K.M. Akther Hossain
Keyword(s):  
Sintering Temperature ◽  
Initial Permeability

Preparation and Magnetic Properties of Low Temperature Sintering Bi-Substituted Yttrium Iron Garnet

2007 ◽  
Vol 280-283 ◽  
pp. 481-484 ◽  
Author(s):  
Hong Jie Zhao ◽  
Ji Zhou ◽  
Zhi Lun Gui ◽  
Long Tu Li
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Saturation Magnetization ◽  
Yttrium Iron Garnet ◽  
Sintering Temperature ◽  
Initial Permeability ◽  
Yttrium Iron ◽  
Garnet Phase ◽  
Iron Garnet ◽  
Ferromagnetic Resonance Linewidth

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 in Bi-substituted YIG gives cause for a decrease of saturation magnetization and an increase of coactivity force.

scholarly journals Effects of sintering temperature on microstructure and magnetic properties of NiFe2O4 prepared from nano size powder of NiO and Fe2O3

1970 ◽  
Vol 34 (2) ◽  
pp. 189-195 ◽  
Author(s):  
Mahabub Alam Bhuiyan ◽  
Sheikh Manjura Hoque ◽  
Shamima Choudhury
Keyword(s):  
Magnetic Properties ◽  
Sintering Temperature ◽  
Great Influence ◽  
Initial Permeability ◽  
X Ray Diffraction ◽  
Wet Chemical ◽  
Diffraction Patterns ◽  
Academy Of Sciences ◽  
Nano Size ◽  
Size Powder

Polycrystalline NiFe2O4 was prepared by solid state reaction from nano size powder of NiO and Fe2O3 which were synthesized by wet chemical method. The inverse spinel single phase of the sample has been confirmed by the X-ray diffraction patterns. SEM micrographs of the samples revealed that the grain size increases and the porosity decreases with the increase in sintering temperature and has great influence on the magnetic properties of NiFe2O4 . Enhancement of real part of initial permeability (μ′) as a function of frequency has been observed with the increase in sintering temperature. Temperature dependence real part of initial permeability has been observed at various sintering temperature and gives the manifestation of Hopkinson effect. Variation of Curie temperature (Tc) has been found with the variation of sintering temperature. Key words: Sintering temperature; Microstructure; Magnetic properties DOI: 10.3329/jbas.v34i2.6865Journal of Bangladesh Academy of Sciences, Vol. 34, No. 2, 189-195, 2010

EFFECT OF PARTICLE SIZE ON THE PROPERTIES OF Mg–Mn FERRITES

2006 ◽  
Vol 20 (19) ◽  
pp. 1163-1171 ◽  
Author(s):  
M. SINGH
Keyword(s):  
Particle Size ◽  
High Performance ◽  
Magnetic Particles ◽  
Sintering Temperature ◽  
Initial Permeability ◽  
Ceramic Method ◽  
Citrate Method ◽  
Tremendous Importance ◽  
Effect Of Particle Size ◽  
Citrate Precursor

Processing of ferrites has gained tremendous importance in recent times in order to meet high performance demands on ferrites in keeping with the fast emerging technologies. The main focus of research in the 21st century is towards the formation of smaller magnetic particles. In normal ceramic methods we cannot control particle size and porosity, whereas in precursor methods we can control both. In the present study we have synthesized Mg 0.9 Mn 0.1 Fe 2 O 4 ferrites by the normal ceramic method and the citrate precursor method. By the citrate method we have simultaneously reduced the particle size and sintering temperature as compared to the normal ceramic method. By the citrate method, direct current (DC) resistivity is increased by two orders of magnitude, and electrical as well as magnetic losses are reduced as compared to the normal ceramic method. The initial permeability is reduced in both citrate method as compared to the normal ceramic methods. However, with sintering temperature the initial permeability increases. The dielectric constant is reduced by the citrate method as compared to normal ceramic methods. These observations are explained on the basis of various mechanisms and models.

scholarly journals Microstructure and Complex Permeability Spectra of Polycrystalline Cu-Zn Ferrites

2012 ◽  
Vol 4 (3) ◽  
pp. 551-560 ◽  
Author(s):  
Shahida Akhter ◽  
D. P. Paul ◽  
M. A. Hakim ◽  
S. Akhter ◽  
D. K. Saha ◽  
...  
Keyword(s):  
Single Phase ◽  
Sintering Temperature ◽  
Lattice Parameter ◽  
Initial Permeability ◽  
Complex Permeability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zn Concentration ◽  
Zn Ferrite ◽  
Zn Content

Cu-Zn ferrites of composition Cu1-xZnxFe2O4 were prepared by double sintering ceramic technique at 9500C and 10500C for 3 hours and 2 hours, respectively. Structural and magnetic properties of the Cu-Zn ferrites were investigated by using X-ray diffraction, microstructure study and complex permeability behaviour. X-ray analysis indicated the formation of single-phase cubic spinel structure for all samples. The lattice parameter was found to increase with increasing Zn content obeying Vegard’s law. The X-ray and bulk densities of the Cu-Zn ferrite significantly decreased whereas porosity increased with increasing Zn concentration. Micrographs exhibited decrease in grain size with increasing concentrations. The real part ?’of initial permeability remained constant up to certain lower range of frequency after which it decreased to lower value of permeability. ?’ increased with increasing Zn contents up to x = 0.5, after that it decreased with higher Zn content but  was also found to increase with sintering temperature. The possible reasons responsible for change in structural, microstructural and complex permeability with increasing of non-magnetic Zn2+ ion are ascertained.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i3.10798 J. Sci. Res. 4 (3), 551-560 (2012)

STRUCTURAL, ELECTRICAL AND MAGNETIC CHARACTERIZATION OF Ni–Cu–Zn SPINEL FERRITES

2011 ◽  
Vol 25 (03) ◽  
pp. 211-222 ◽  
Author(s):  
M. PENCHAL REDDY ◽  
M. VENKATA RAMANA ◽  
N. RAMA MANOHAR REDDY ◽  
K. V. SIVA KUMAR ◽  
R. RAMA KRISHNA REDDY ◽  
...  
Keyword(s):  
Single Phase ◽  
Sintering Temperature ◽  
Microwave Sintering ◽  
Initial Permeability ◽  
Electromagnetic Devices ◽  
Zn Ferrite ◽  
Conventional Sintering ◽  
Tan Δ ◽  
Sintering Method

Ni – Cu – Zn ferrite materials have been extensively used in multilayer chip inductors because of their remarkable properties at higher frequencies. In the present work, single phase Ni 0.35 Cu 0.05 Zn 0.60 Fe 1.98 O 4-δ ferrite, has been prepared by microwave sintered (MS) method. In comparison with the conventional sintering method (CS), the sintering temperature and time for this MS method were significantly reduced to 30 min and 950°C from 5 h and 1250°C for the CS process. The frequency dependence of the dielectric properties such as dielectric constant (ε'), dielectric loss ( tan δ) were studied. The temperature dependence of magnetic initial permeability (μi) was studied. The saturation magnetization was also studied as a function of magnetic field. These microwave sintered ferrites results were compared with the properties of ferrites prepared by conventional sintering method in normal heating. Microwave sintering improves structural as well as electromagnetic parameters measured and thus makes the ferrite more suitable in microwave applications and electromagnetic devices.

scholarly journals Sintering Temperature Dependent Permeability of Nanocrystalline Ni0.20Cu0.30Zn0.50Fe2O4 Ferrite

2011 ◽  
Vol 35 (1) ◽  
pp. 67-75 ◽  
Author(s):  
ML Rahman ◽  
MHR Khan ◽  
ST Mahmud ◽  
AKM Akther Hossain
Keyword(s):  
Room Temperature ◽  
Sintering Temperature ◽  
Spinel Ferrite ◽  
Magnetization Measurement ◽  
Initial Permeability ◽  
Neel Temperature ◽  
Néel Temperature ◽  
Dc Magnetization ◽  
Average Grain Size ◽  
Auto Combustion

The spinel ferrite of Ni0.20Cu0.30Zn0.50Fe2O4 was studied at room temperature using X-ray diffraction pattern prepared by auto combustion technique. The analysis of the XRD patterns showed that the sample has a single phase cubic spinel structure. The bulk density, average grain size and initial permeability increase with increasing sintering temperature up to a optimum temperature. Beyond that temperature all those properties decreases. The value of relative quality factor decreases with increasing sintering temperature. The DC magnetization measurement showed that at room temperature the sample is in ferrimagnetic state. The number of Bohr magneton, n(?B), Néel temperature, TN, and the field at which saturation occurs were also calculated and possible explanation for the observed characteristics of microstructure, initial permeability, DC magnetization, and Néel temperature of the studied sample are presented.DOI: http://dx.doi.org/10.3329/jbas.v35i1.7972Journal of Bangladesh Academy of Sciences, Vol.35, No.1, 67-75, 2011

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