Properties Of Manganese-zinc Ferrites Research Articles

The Correlation Between the Temperature Control Effect and Thermoelectric Properties of CNTs/Mn-Zn Ferrite Composites

Mn-Zn ferrite has been widely used in cancer therapy. In this paper, CNTs/Mn-Zn ferrite composites with different CNT contents were synthesized using the co-precipitation process and then sintered into bulk materials by SPS. The nanoparticles have good heating and temperature control effects under an alternating magnetic field. Furthermore, the sintered composites have thermoelectric properties. The correlation between the temperature control mechanism and the thermoelectric properties of manganese zinc ferrite for thermotherapy is investigated.

Comparison of Mechanical Properties and Magnetic Properties of Mn0.8Zn0.2Fe2O4 Synthesized by Conventional Ball Milling and Self Combustion Method

Manganese zinc ferrite is a soft ferrite material that has been used in many applications including catalyst. Therefore, studies on the mechanical and magnetic properties are very important in order to enhance the performance of the catalyst. This study will compare the mechanical and magnetic properties of manganese zinc ferrite (Mn0.8Zn0.2Fe2O4) synthesized by conventional ball milling and self combustion methods. Microhardness Vickers and Impedance Analyzer were used to investigate. Morphology and structure of Mn0.8Zn0.2Fe2O4 were characterized by using X-Ray Diffraction, Field Emission Scanning Electron Microscope (FESEM) and Energy Dispersive X-Ray (EDX). The catalyst characterization was performed using a Temperature Program Reduction (TPR). It has been shown that Mn0.8Zn0.2Fe2O4 synthesized by self combustion method has better mechanical properties (75.83 HVN) and magnetic properties with a superior initial permeability (2.5 × 103) and Relative Loss Factor (0.03) compared to conventional ball milling method. © 2011 Asian Network for Scientific Information

Processing effects on in-flight particle state and functional coating properties of plasma-sprayed manganese zinc ferrite

Magnetic properties of manganese zinc ferrite (MZF) coatings deposited by atmospheric dc plasma spraying largely depend on zinc and oxygen loss during particle flight. The temperature and velocity of in-flight MZF particles were widely varied by changing plasma spray conditions to examine these chemistry changes and resultant magnetic properties. Zn loss increases with increased particle temperature or decreased particle velocity. Meanwhile, wustite (FeO) formation, related to the oxygen loss, is more complicated, partly because oxygen, which is lost during flight in the high-temperature zone of the plasma jet, can be recovered at longer spray distances. As a result, the saturation magnetization of MZF coatings decreases and the coercivity increases with increased particle temperature or decreased particle velocity.

Geometry effect on the magnetic properties of manganese zinc ferrite

The geometry effect on the bulk magnetic properties of MnZn ferrite toroidal cores produced by the ceramic method was investigated. The MnZn ferrite powder was pressed at two different toroidal sizes and sintered, under controlled atmosphere at different temperatures. The MnZn ferrites cores were characterized according to their magnetic losses, electrical resistivity, initial permeability and Curie temperature. The total loss (200 mT, 100 kHz) in the small cores S (aspect ratio (AR)=2.84) is lower compared with the total loss in the large cores L (AR=0.79). These results show an agreement with the geometry effect observed on electrical steels.

Effects of SnO 2 addition on the magnetic properties of manganese zinc ferrites

SnO 2 was added to high-permeability MnZn ferrites and MnZn ferrites for high-frequency power supplies. The effects of the SnO 2 addition were studied. Sn 4+ ions can dissolve into the spinel lattice and form stable Fe 2+–Sn 4+ pairs and hence can compensate the magneto-crystalline anisotropy constant K 1 and improve the initial permeability effectively. The initial permeability of ferrites is also improved as abnormal grain growth caused by ion vacancy is controlled with SnO 2 doping. In addition, the SnO 2 doping also leads to a decrease in the relative loss factor and an increase in density. The power loss and minimum power loss temperature decrease with SnO 2 doping.

ＭｎＺｎ系Ｈｉｇｈ Ｂｓフェライトの磁気特性およびコアロスの冷却速度依存性

Magnetic properties of manganese zinc ferrites with high saturation magnetic flux density (Bs) were investigated. Bs of more than 500 mT at 100°C was obtained with the composition where Fe2O3 is approximately 64 mol% or more. In Fe-rich compositions, an increased number of cation vacancies were generally observed. This causes changes in magnetic properties as time elapses. The cation vacancies also causes the deterioration of core loss (Pcv) and initial magnetic permeability. By sintering under low oxygen partial pressure (Po2), the number of cation vacancies decreased, however, Pcv increased. One cause of this is the decrease of electrical resistivity. The total electrical resistivity is dominated by that at grain boundary. We also studied the cooling rate, which controls the resistivity at grain boundary.

Effect of heat treatment conditions on properties of manganese-zinc ferrites: J. Miklik, V. Chroust (Vyzkumny, Ustav Praskove Metal., Sumperk, Czechoslovakia), Pokroky Psaskove Metalurgie, No 3, 1993, 5–9. (In Czech)

Effect of heat treatment conditions on properties of manganese-zinc ferrites: J. Miklik, V. Chroust (Vyzkumny, Ustav Praskove Metal., Sumperk, Czechoslovakia), Pokroky Psaskove Metalurgie, No 3, 1993, 5–9. (In Czech)

Effects of oxygen hot isostatic pressing on properties of manganese-zinc ferrites : H. Ochiai, O. Kimura (Shonan Institute of Technology, Kanagawa, Japan)

Effects of oxygen hot isostatic pressing on properties of manganese-zinc ferrites : H. Ochiai, O. Kimura (Shonan Institute of Technology, Kanagawa, Japan)

A non-destructive analysis of the influence of sputter-etching on the magnetic surface properties of manganese zinc ferrite (100) surfaces using ellipsometry and the polar magneto-optical Kerr effect

Ellipsometry and the polar magneto-optical Kerr effect have been used in the photon energy range 0.65 eV⩽ hv⩽5.4 eV to study sputter-etched manganese zinc ferrite (100) surfaces. With an annealed sample as a reference, a stratified media calculation indicates the presence of a paramagnetic surface layer of 8–40 nm thickness, depending on sputter parameters. Conversion electron Mössbauer spectroscopy and Rutherford backscattering spectroscopy fully confirmed these results.

A non-destructive analysis of the influence of sputter etching on the magnetic surface properties of manganese zinc ferrite

A non-destructive analysis of the influence of sputter etching on the magnetic surface properties of manganese zinc ferrite

A non-destructive analysis of the influence of sputter etching on the magnetic surface properties of manganese zinc ferrite

Spectroscopic ellipsometry and the polar magneto-optical Kerr effect (0.6 < hv < 4.5 eV) have been used to study non-destructively the influence of RF sputter etching on the magnetic surface properties of the (100) face of manganese zinc ferrite single crystals. The effect of the sputtering can be described by the formation of a non-magnetic surface layer, which is presumably amorphous.

Effect of physicochemical transformations occurring in compacts during heating on the properties of manganese-zinc ferrites

The temperature ranges of the physicochemical transformations occurring during heating in compacts from manganese-zinc ferrite powders produced by different methods have been established. The effect of method of preparation of ferrite powders on the character of processes taking place in compacts during heating is demonstrated. The degree of decomposition of the spinel at a given rate of heating is lower in powders produced by the carbonate coprecipitation method than in powders obtained from an oxide mixture. The reason for this is that the structure of carbonate-grade powders has comparatively few defects. Lowering the rate of heating of specimens in the temperature range 550–650‡C increases the degree of decomposition of the spinel, ensures a better reproducibility of properties, and improves the quality of ferrite parts.

The effect of cobalt substitutions on some properties of manganese zinc ferrites

The effect of cobalt substitutions in manganese zinc ferro ferrites for inductor applications is discussed. Permeability-temperature curves are presented over the range -50 degrees C to 200 degrees C for compositions where the cobalt level is varied between 0 and 0.010 per formula unit, the Mn/Zn ratio and Fe2+ level being held constant at 3.5 and 0.105 per formula unit respectively. The anisotropy compensation model fails to give a satisfactory explanation of the above curves since the materials exhibit a uniaxial anisotropy, the degree of which is dependent on the thermal history of the samples. The effect causes the permeability to be unstable in time and the resulting high disaccommodation makes application of such materials unlikely.

Synthesis of Manganese-Zinc Ferrite: Influence of Sintering Atmosphere and Types of the Raw Materials on the Ferrite Properties

The electromagnetic properties of manganese-zinc ferrites are strongly affected by the synthesis parameters. The influence of sintering atmospheres on magnetic permeability, temperature dependence of permeability, loss, disaccommodation and induction were examined. The effect of the types of raw materials used in the synthesis on the magnetic parameters were studied.Based on these studies, commercially important ferrites suitable for various practical applications have been synthesised.

Effect of Cd-for-Zn Substitution on Magnetic Properties of Manganese Zinc Ferrites

Journal of the American Ceramic SocietyVolume 51, Issue 9 p. 533-534 Effect of Cd-for-Zn Substitution on Magnetic Properties of Manganese Zinc Ferrites S. NATANSOHN, S. NATANSOHNSearch for more papers by this authorD. H. BAIRD, D. H. BAIRDSearch for more papers by this author S. NATANSOHN, S. NATANSOHNSearch for more papers by this authorD. H. BAIRD, D. H. BAIRDSearch for more papers by this author First published: September 1968 https://doi.org/10.1111/j.1151-2916.1968.tb15684.xCitations: 1 Presented at the Fall Meeting, the Electronics Division of The American Ceramic Society and The Institute of Ceramic Engineers, Kiamesha Lake, N. Q., September 19, 1967 (Paper No. 16-EI-67F). The writers are, respectively, section head and group manager, Bayside Laboratory, Research Center, General Telephone & Electronics Laboratories Incorporated, Bayside, New York 11360. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume51, Issue9September 1968Pages 533-534 RelatedInformation

Effect of Impurities on Electrical and Dielectric Properties of Manganese Zinc Ferrites

Effect of Impurities on Electrical and Dielectric Properties of Manganese Zinc Ferrites

The properties of manganese-zinc ferrites and the physical processes governing them

The paper outlines some of the electrical and physical properties of manganese-zinc ferrites and the mechanisms by which they occur. Initial permeability is shown to depend on stoichiometry, granular structure and composition, while the temperature coefficient of permeability is shown to be controllable by the addition of small amounts of trivalent metallic impurities. The influence of composition and manufacturing conditions on the losses, Curie point and induction is examined, and a note on the high-frequency properties is included.