Relevant bibliographies by topics / Manganese ferrite

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Academic literature on the topic 'Manganese ferrite'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Manganese ferrite"

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Al-Khabouri, Saja, Salim Al-Harthi, Toru Maekawa, Mohamed E. Elzain, Ashraf Al-Hinai, Ahmed D. Al-Rawas, Abbsher M. Gismelseed, Ali A. Yousif, and Myo Tay Zar Myint. "Free and partially encapsulated manganese ferrite nanoparticles in multiwall carbon nanotubes." Beilstein Journal of Nanotechnology 11 (December 29, 2020): 1891–904. http://dx.doi.org/10.3762/bjnano.11.170.

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Free and partially encapsulated manganese ferrite (MnFe2O4) nanoparticles are synthesized and characterized regarding structure, surface, and electronic and magnetic properties. The preparation method of partially encapsulated manganese ferrite enables the formation of a hybrid nanoparticle/tube system, which exhibits properties of manganese ferrite nanoparticles inside and attached to the external surface of the tubes. The effect of having manganese ferrite nanoparticles inside the tubes is observed as a shift in the X-ray diffraction peaks and as an increase in stress, hyperfine field, and coercivity when compared to free manganese ferrite nanoparticles. On the other hand, a strong charge transfer from the multiwall carbon nanotubes is attributed to the attachment of manganese ferrite nanoparticles outside the tubes, which is detected by a significant decrease in the σ band emission of the ultraviolet photoemission spectroscopy signal. This is followed by an increase in the density of states at the Fermi level of the attached manganese ferrite nanoparticles in comparison to free manganese ferrite nanoparticles, which leads to an enhancement of the metallic properties.
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Denecke, Melissa A., W. Gunßer, G. Buxbaum, and P. Kuske. "Manganese valence in precipitated manganese ferrite." Materials Research Bulletin 27, no. 4 (April 1992): 507–14. http://dx.doi.org/10.1016/0025-5408(92)90029-y.

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Taguba, Manny Anthony, Dennis Ong, Benny Marie Ensano, Chi-Chuan Kan, Nurak Grisdanurak, Jurng-Jae Yee, and Mark Daniel de Luna. "Nonlinear Isotherm and Kinetic Modeling of Cu(II) and Pb(II) Uptake from Water by MnFe2O4/Chitosan Nanoadsorbents." Water 13, no. 12 (June 14, 2021): 1662. http://dx.doi.org/10.3390/w13121662.

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Researchers are in continuous search of better strategies to minimize, if not prevent, the anthropogenic release of toxic heavy metals, such as Cu(II) and Pb(II), into drinking water resources and the natural environment. Herein, we report for the first time the low-temperature combustion synthesis of magnetic chitosan-manganese ferrite in the absence of toxic cross-linking agents and its removal of Cu(II) and Pb(II) from single-component metal solutions. The nonlinear Langmuir model best described the isotherm data, while the nonlinear pseudo-second order model best described the kinetic data, signifying monolayer Cu(II) or Pb(II) adsorption and chemisorption as the rate-determining step, respectively. Adsorption capacities by magnetic chitosan-manganese ferrite obtained for both metals were consistently higher than those by manganese ferrite, indicating that chitosan enhanced the performance of the magnetic adsorbent. The maximum adsorption capacities of magnetic chitosan-manganese ferrite for Cu(II) and Pb(II) were 14.86 and 15.36 mg g−1, while that of manganese ferrite were 2.59 and 13.52 mg g−1, respectively. Moreover, the adsorbents showed superior binding affinity and sorption for Pb(II) than Cu(II) owing to the stronger ability of the former to form inner-sphere complexes with manganese ferrite and magnetic chitosan-manganese ferrite. Finally, thermodynamic studies revealed that the uptake of either Pb(II) or Cu(II) by magnetic chitosan-manganese ferrite was spontaneous and endothermic. The as-prepared adsorbent was characterized for morphology, elemental composition, surface functional sites, and particle size using scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, and dynamic light scattering technique, respectively.
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Seyyed Ebrahimi, S. A., and Z. Pishgahi Fard. "An Investigation on the Optimum Conditions for Preparation of Pure Mn-Mg-Zn Ferrite Powder." Key Engineering Materials 336-338 (April 2007): 699–702. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.699.

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Manganese- Zinc ferrite is one of the most important spinel ferrites which is used in the electronics applications. These ferrites have an open lattice and can tolerate large amounts of the other metallic ions in their lattice. One of these divalent ions that can sit in the unit cell of Mn-Zn ferrites is Magnesium. Mn-Mg-Zn ferrites are new materials which is thought to be a good candidate for dielectric applications. In this work, a suitable relative values of raw materials for preparing pure Mn-Mg-Zn ferrite powder have been determined. It is carried out by using XRD experiments. The optimum temperature and time of calcination were also investigated by DTA/TGA, XRD and SEM techniques.
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Cai, Wei, Chun Lin Fu, Rong Li Gao, Wei Hai Jiang, Xiao Ling Deng, and Gang Chen. "Ferroelectric and Photovoltaic Properties of Mn-Doped Bismuth Ferrite Thin Films." Materials Science Forum 815 (March 2015): 135–40. http://dx.doi.org/10.4028/www.scientific.net/msf.815.135.

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Bismuth ferrite is an important material in ferroelectric photovoltaic field, because of its narrow band gap and large polarization. Doping is a common method to further improve the photovoltaic properties of bismuth ferrite. Mn-doped bismuth ferrite thin films were prepared by sol-gel method. The effects of manganese on the crystal structure, ferroelectric and photovoltaic properties have been investigated. The result indicates that Mn-doped bismuth ferrite thin films are single phase and the lattice constant increases with the increase of manganese content. As manganese content increases, the remnant polarization and coercive electric field increase, while the short circuit photocurrent density and power conversion efficiency decrease. The open circuit photovoltage increases first and reaches the maximum and then decreases as manganese content increases. The results indicate that enhanced ferroelectricity caused by addition of manganese doesn’t make improvement on the photovoltaic characteristic.
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Bhalla, Deepak, S. K. Aggarwal, G. P. Govil, and Ish Kakkar. "Manufacturing of Manganese-Zinc Soft Ferrite by Powder Metallurgy." Open Materials Science Journal 4, no. 1 (February 3, 2010): 26–31. http://dx.doi.org/10.2174/1874088x010040100026.

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Objective of this paper is, improvement of quality of Mn-Zn soft ferrites manufactured by powder metallurgy and overall output yield of it's plant. The efforts have been made to synthesize the crucial parameters which are responsible for better material preparation, pressing and sintering. By adopting these recommendations, the rejection rate is substantially reduced and the variation in magnetic properties is less. Data, which give more uniformity in bigger lots and are responsible for more uniform magnetic properties, have been discussed. Simple, quality-control instruments and their measurement methods which can be incorporated for stage inspection have been explained. The additives for better ferrite powder preparation, granules making and to obtain better magnetic have been discussed. Improved pressing, sintering, porosity, density and permeability relationship have been drawn. A sintering method to obtain better sintered density and high permeability in ferrites is also explained.
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Yoo, Han-Ill, and Harry L. Tuller. "In situ phase equilibria determination of a manganese ferrite by electrical means." Journal of Materials Research 3, no. 3 (June 1988): 552–56. http://dx.doi.org/10.1557/jmr.1988.0552.

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Electrical conductivity and thermoelectric power have been measured for a series of MnZn ferrites as functions of the oxygen partial pressure under high-temperature equilibrium conditions. The isothermal variation of both properties was successfully correlated to the onset of phase transitions at characteristic Po2's. The ferrite 0.482MnO-0.518Fe2O3 was examined in some detail to locate the stability fields of the metallic alloy of iron and manganese, manganowustite, the spinel ferrite, and the hematitelike phase, and to extract the appropriate free-energy data. The results confirmed by x-ray diffraction are in satisfactory agreement with literature data.
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Al-Hilli, Muthafer F. "A comparison study of the Structural and magnetic properties of pure Ni metal and NiZnMn ferrite." Iraqi Journal of Physics (IJP) 17, no. 43 (November 29, 2019): 18–25. http://dx.doi.org/10.30723/ijp.v17i43.418.

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The magnetic properties of a pure Nickel metal and Nickel-Zinc-Manganese ferrites having the chemical formula Ni0.1(Zn0.4Mn0.6)0.9Fe2O4 were studied. The phase formation and crystal structure was studied by using x-ray diffraction which confirmed the formation of pure single spinel cubic phase with space group (Fd3m) in the ferrite. The samples microstructure was studied with scanning electron microstructure and EDX. The magnetic properties of the ferrite and nickel metal were characterized by using a laboratory setup with a magnetic field in the range from 0-500 G. The ferrite showed perfect soft spinel phase behavior while the nickel sample showed higher magnetic loss and coercivity.
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Peters, Joop A. "Relaxivity of manganese ferrite nanoparticles." Progress in Nuclear Magnetic Resonance Spectroscopy 120-121 (October 2020): 72–94. http://dx.doi.org/10.1016/j.pnmrs.2020.07.002.

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Katsnelson, E. Z. "Photogalvanomagnetic Properties of Manganese Ferrite." Physica Status Solidi (a) 104, no. 2 (December 16, 1987): K127—K132. http://dx.doi.org/10.1002/pssa.2211040261.

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Dissertations / Theses on the topic "Manganese ferrite"

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Tourinho, Francisco. "Ferrofluides a base de ferrite de cobalt et de ferrite de manganese : elaboration, comportement physicochimique et magnetique." Paris 6, 1988. http://www.theses.fr/1988PA066570.

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Roberts, V. A. "The production of manganese zinc ferrite by the citrate gel route." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380216.

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Zufelato, Nícholas. "Hipertermia magnética de nanopartículas à base de ferrita de manganês: efeito do recobrimento superficial de nanopartículas por moléculas de citrato." Universidade Federal de Goiás, 2012. http://repositorio.bc.ufg.br/tede/handle/tede/8164.

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This work investigated the magneto-thermal properties of manganese ferrite-based nanoparticles. The nanosctructures were synthesized by the coprecipitation method. Three samples were studied, namely: non passivated (2A), passivated (2B), and passivated with citrate coating molecules (2B cit). The particles were characterized by x-ray diffraction (XRD), transmission eléctron microscopy (TEM), vibrating sample magnetometer (VSM) and electron magnetic resonance (EMR). The non-coated samples showed similar diameter and saturation magnetization values, while the citrate-coated sample showed striking diferente values. In particular, the 2B cit sample showed lower values of particle size (determined from Scherrer relation), saturation magnetization and magnetic anisotropy. Those results corroborate with a core-shell nanoparticle model. The magnetic hyperthermia studies, perfomed around 300kHz, revealed that sample 2B had a higher magneto-thermal effiency when compared with the 2B cit one. Dynamic hysteresis curves, obtained within the linear response regime, were capable to explian qualitatively the experimental data. The phenomena was related to a lower magnetic anisotropy for the 2B cit nanoparticles. In addition, the biocompatible magnetic colloid (2B cit) showed SAR values around 50 W/g of MnFe 2 O 4 at the high field limit. However, differently from results reported in the literature, based upon magnetite/maghemite nanoparticles, saturation is achieved at a lower magnetic field amplitude. This suggest that this type of material has great biomedical potential for low-field magnetic hyperthermia applications, which might be necessary in order to inhibit harmful eddy currents inside the patient’s body.
Neste trabalho investigamos as propriedades magneto-térmicas de nanopartículas à base de ferrita de manganês. As nanopartículas foram sintetizadas pelo método de coprecipitação. Três amostras foram investigadas, são elas: nanopartículas não passivadas (2A), passivadas (2B) e passivadas recobertas com moléculas de citrato (2B cit). As nanoestruturas foram caracterizadas por difração de raios-X (DRX). microscopia eletrônica de transmissão (TEM), magnetometria de amostra vibrante (VSM) e ressonância magnética eletrônica (RME). As amostras não recobertas apresentaram valores de diâmetro e magnetização de saturação semelhantes, enquanto que uma significativa alteração foi evidenciada na amostra recoberta. Esta amostra (2B cit) apresentou valores de diâmetro (utilizando a relação de Scherrer), constante de anisotropia e magnetização menores que as não recobertas. Tais resultados corroboram para a formação de uma nanopartícula do tipo core-shell. Os estudos de magnetohipertermia, realizados em torno de 300kHz, revelaram, ainda, que a amostra 2B apresenta uma eficiência magneto-térmica bem maior que a 2B cit. Curvas de histerese dinâmica, usando a teoria do regime linear, foram capazes de explicar qualitativamente tais resultados. O fenômeno foi explicado pela menor anisotropia magnética da amostra 2B cit. Adicionalmente, o fluido magnético biocompatível (amostra 2B cit) apresentou um SAR em torno de 50 W/g de MnFe 2 O 4 no limite de alto campo. Entretanto, diferentemente de outras amostras da literatura à base de magnetita/maguemita, a saturação foi alcançada em baixa amplitude de campo magnético. Isto sugere, que esta amostra, possui grande potencial biomédico em aplicações de hipertermia magnética com baixa amplitude de campo, as quais são desejáveis para inibir possíveis correntes parasitas em tecidos sadios.
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Debray, Bruno. "Microstructure and mechanical properties of an as-hot rolled carbon manganese ferrite-bainite sheet steel." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69713.

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By means of torsion testing, the microstructures and mechanical properties produced in a 0.14%C-1.18%Mn steel were investigated over a wide range of hot rolling conditions, cooling rates and coiling temperatures. The reheating temperature was varied between 800$ sp circ$C and 1050$ sp circ$C, and strains between 0 and 0.8 were applied. This led to austenite grain sizes ranging from 10 to 150$ mu$m. Two cooling rates, 55$ sp circ$C/s and 90$ sp circ$C/s, were applied and cooling was interrupted at coiling temperatures ranging from 550$ sp circ$C to 300$ sp circ$C.
Optical microscopy and TEM were used to study the microstructures. The mechanical properties were studied by means of tensile testing. A method developed by IRSID for deducing the transformation kinetics from the cooling data was adapted to the present context and used successfully to interpret the observed influence of the process parameters. (Abstract shortened by UMI.)
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Semykina, Anna. "Recovery of iron and manganese values from metallurgical slags by the oxidation route." Doctoral thesis, KTH, Materialens processvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24534.

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In the modern practice, a sustainable development strategy in a domain of wasteutilization is shifting its focus from a general completeness of recycling to a morespecific attention to efficiently utilize elements in the wastes. This is well-illustrated bythe steelmaking slag industries. The major waste product from the steelmaking practiceis slag and its main constituents are: CaO, SiO2, Al2O3, MnO, FeO and so on. The mainfield of application for the steelmaking slags is civil engineering, especially for road andwaterway construction. However, a significant amount of the slag remains in the dumps,damaging the environment as well as requiring a land for secure storage. Efficientrecycling of these materials is of increasing interest worldwide as a result of increasingsustainability in processes with respect to increasing raw material costs and wastereduction.In order to find a practical solution, joint efforts are currently made at the RoyalInstitute of Technology, Sweden and National Metallurgical Academy of Ukraine. Theconcept is based on transformation of non-magnetic wüstite (FeO) to magneticmagnetite (Fe3O4) using an oxidizing atmosphere was proposed.In order to verify the feasibility of the proposed way of slag utilization, experiments onthe ternary CaO-FeO-SiO2 and quaternary CaO-FeO-SiO2-MnO slags systems,accompanied by thermodynamic and kinetic modelling, were performed. The crystalprecipitation during synthetic slag oxidation was observed by Confocal Scanning LaserMicroscopy (CSLM). Precipitated phases were found to be magnetite and manganeseferrite in the spinel form.Obtained magnetite and manganese ferrite can be separated from the slag by magneticseparation.The formation of nanosize manganese ferrite from the CaO-FeO-SiO2-MnO slag systemduring oxidation was investigated. Experiments were conducted in a horizontalresistance furnace in an oxidizing atmosphere (air). The final product was analysed by Xraydiffraction (XRD). The particles size of the manganese ferrite was estimated by theScherrer formula and was found to be of the order of 23-25 nm. In order to get anunderstanding of the magnetic properties of the manganese ferrite recovered from slagtreatment, it was necessary to synthesize a reference compound from pure precursors.The MnFe2O4 nanopowder was synthesized by the oxalate route. The size effects on themagnetic properties of manganese ferrite particles were investigated.IIThe potential way of the magnetite particles separation from liquid slags was investigatedby cold model studies. The experimental technique of mobilising non-conducting,nonmagnetic particles in conducting liquid in crossed electric and magnetic fields wasinvestigated in order to find the way of the particle separation from the liquidsteelmaking slags. The effects of the current density, magnetic field, size and shape ofthe particle on the particle velocity under action of the electromagnetic buoyancy force(EBF) in the electrolyte were analyzed.
QC 20100916
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RIBEIRO, THATIANA G. D. "Sintese e caracterizacao de nanoparticulas magneticas de oxidos mistos de MnFesub(2)Osub(4) recobertas comm quitosona. Estudos da influencia na dopagem com Gdsup(3+) nas propriedades estruturais e magneticas." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11515.

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Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Colán, Victoria Amelia Lázaro. "Perdas em ferritas de manganês zinco: o papel da sinterização e de parâmetros microestruturais." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-30112010-144937/.

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O uso das ferritas de manganês zinco em fontes de potência de carregadores de bateria vem crescendo nos últimos anos, devido a suas baixas perdas magnéticas em induções da ordem de 0,2 T. Estas ferritas pertencem à categoria de ferritas moles, são óxidos ferrimagnéticos, policristalinos com estrutura cúbica tipo espinélio. Pós desse material foram compactados em prensa uniaxial e em prensa automática de produção para anel e toróide, respectivamente. Foram realizados dois ciclos de queima variando o teor de oxigênio entre 5 e 15%, no patamar de sinterização, com o propósito de avaliar seu efeito na densidade, microestrutura, perdas magnéticas em altas induções (0,2 T) e permeabilidade. Amostras sinterizadas em posições mais quentes do forno resultaram em maior densidade e maior tamanho de grão, conforme esperado, mas resultaram em maiores perdas a 25 °C. O aumento do teor de oxigênio entre 5 e 15% não alterou sistematicamente a densidade, mas resultou num pequeno aumento do tamanho de grão. Já a correlação entre teor de oxigênio e perdas foi complexa. Foi observado que existe uma temperatura de mínimo nas perdas totais por volta de 60 °C. O mesmo comportamento foi observado na curva da perda histerética, compatível com a variação da constante de anisotropia magnetocristalina (K1). Foram realizados ensaios de curvas de histerese a partir de 25 até 100 °C, a 0,2 T com o objetivo de avaliar o efeito da temperatura nas duas parcelas da perda histerética. Amostras sinterizadas a 1290 °C com a menor pressão de oxigênio apresentaram menor temperatura de mínimo de perda. As técnicas de análise química do teor de Fe2+ não foram capazes de estabelecer, inequivocamente, a esperada relação entre essa variável e o teor de oxigênio da atmosfera de sinterização.
The use of manganese zinc ferrite in power sources of battery chargers is growing, due to its low magnetic power losses at inductions around 0.2 T. These ferrites belong to the soft magnetic materials group, they are polycrystalline ferromagnetic oxides with face centered cubic structure. Powders of this material were compacted in uniaxial press and in automatic press of production, by ring and toroidal form, respectively. Two firing cycles, varying the atmosphere oxygen content between 5 and 15%, were applied to evaluate its effect on microstructure, density, magnetic losses in high induction and permeability. Samples sintered in warmer positions inside the furnace resulted in higher density and larger grain size, as expected, but higher losses at 25 °C were achieved. Increasing the atmosphere oxygen content from 5 to 15% did not alter density significantly, but resulted in a slight increase in grain size. On the other hand, the correlation between oxygen content and losses was complex. There are lower losses, at 60 °C. Similar behavior was observed with hysteresis loss, which is compatible with the change in magnetocrystalline magnetic anisotropy (K1). Measurements were performed from 25 to 100 °C, at 0.2 T, aiming at the evaluation of the effect of temperature on the two parcels of hysteresis loss. Samples sintered at 1290 °C with low atmosphere oxygen content showing a minimum on the losses versus temperature curve. The available techniques to analyze Fe2+ content were not capable of establishing, unequivocally, the expected relation between this variable and the oxygen content of the sintering atmosphere.
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Recouvreur, Michel. "Contribution à l'étude des liants organiques pour ferrites étude de l'alcool polyvinylique dans le ferrite manganèse-zinc /." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37600681v.

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Verdier, Thomas. "Elaboration de poudres nanostructurées de ferrites de manganèse-zinc par mécanosynthèse : Influence des paramètres de broyage." Rouen, 2006. http://www.theses.fr/2006ROUES042.

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Les ferrites mixtes de Mn-Zn ont un grand intérêt commercial du fait de leurs propriétés magnétiques à haute fréquence. Cette thèse présente l’influence des modes de broyage sur la synthèse de ferrites Mn-Zn à partir d’oxydes simples. La ferrite obtenue par mécanosynthèse présente une réorganisation de la distribution cationique au sein de la structure spinelle, ce qui peut améliorer les propriétés du matériau massif après mise en forme. Des broyages réalisés dans un matériel en acier ont permis de mettre en évidence la présence de Fe2+ provenant de réactions d’oxydo-réduction entre le fer et les oxydes. Des broyages réalisés dans des jarres en WC ont conduit à l’obtention de phases pures de ferrites de zinc et de manganèse-zinc exemptes d’ions Fe2+. Des expériences de spectrométrie Mössbauer sous champ magnétique ont permis de préciser la distribution cationique des ferrites synthétisés
Spinel ferrites compounds are widely used for their technological applications, which are essentially their magnetic and catalytic properties. Nanocrystalline Mn-Zn ferrites have been synthesized by high-energy ball milling in different media (tempered steel and WC) starting from simple oxides (α-Fe2O3, ZnO and MnO). This technique leads to a change in the distribution of cations in both sites, resulting in an increase of magnetic properties. X-ray diffraction, Mössbauer spectrometry and VSM are used to characterize the powders. This work shows that a redox reaction is observed between Fe11 and metalling iron during milling in steel medium, leading to a spinel phase containing some Fe11. The mechanism for the appearance of this phase is studied : ZnO seems to have a non negligeable influence on the synthesis, by creating an intermediate wüstite-type phase solid solution with FeO. Millings in WC medium permit to avoid the Fe11 contamination
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Ferreira, Diego Lopes. "Síntese e caracterização de microesferas poliméricas reticuladas à base de poli(ácido metacrílico) contendo nanopartículas magnéticas de ferritas de manganês." Universidade do Estado do Rio de Janeiro, 2012. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=3572.

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As nanopartículas de ferritas de manganês (MnFe2O4) tem sido de grande interesse por causa de suas notáveis propriedades magnéticas doces (baixa coercividade e moderada magnetização de saturação) acompanhada com boa estabilidade química e dureza mecânica. A formação de materiais híbridos/compósito estabiliza as nanopartículas magnéticas (NPMs) e gera funcionalidades aos materiais. Entretanto, não foi encontrada na literatura uma discussão sobre a síntese e as propriedades de polímeros polares reticulados à base de ácido metacrílico contendo ferritas de manganês na matriz polimérica. Assim, o objetivo desta Dissertação foi produzir partículas esféricas poliméricas reticuladas, com boas propriedades magnéticas, à base de ácido metacrílico, estireno, divinilbenzeno e ferritas de manganês. Neste trabalho, foram sintetizados compósitos de ferrita de manganês (MnFe2O4) dispersa em copolímeros de poli(ácido-metacrílico-co-estireno-co-divinilbenzeno), via polimerização em suspensão e em semi-suspensão. Foram variados os teores de ferrita (1% e 5%) e a concentração do agente de suspensão (0,2% e 5%). Além disso, foram testadas sínteses contendo a fase orgânica pré-polimerizada, e também a mistura da ferrita na fase orgânica (FO), antes da etapa da polimerização em suspensão. Os copolímeros foram analisados quanto as suas morfologias - microscopia óptica; propriedades magnéticas e distribuição das ferritas na matriz polimérica - VSM, SEM e EDS-X; propriedades térmicas TGA; concentração de metais presentes na matriz polimérica absorção atômica. As ferritas foram avaliadas quanto à cristalografia XRD. A matriz polimérica foi avaliada pela técnica de FTIR. As amostras que foram pré-polimerizadas e as que além de pré-polimerizadas foram misturadas as ferritas de manganês na FO, apresentaram as melhores propriedades magnéticas e uma incorporação maior da ferrita na matriz polimérica. Essas rotas sintéticas fizeram com que os copolímeros não apresentassem aglomeração, e também minimizou a presença de ferritas na superfície das microesferas. Em geral, todos os copolímeros obtidos apresentaram as características de materiais magneticamente doces além do superparamagnetismo. Foi constatado que o aumento da concentração do PVA e a diminuição da concentração da ferrita fazem com que os diâmetros das microesferas decresçam. Os resultados de TGA e DTG mostraram que ao misturar as ferritas na FO, a concentração de material magnético na matriz polimérica aumenta cerca de 10%. Entretanto, somente a amostra PM2550, pré-polimerizada e com as ferritas misturadas na FO (5% de ferrita e 0,2% de PVA), apresentou potencial aplicação. Isso porque as ferritas não ficaram expostas na superfície das microesferas, ou seja, o material magnético fica protegido de qualquer ação externa
Manganese ferrite (MnFe2O4) nanoparticles have been of great interest for their remarkable soft-magnetic properties (low coercivity, moderate saturation magnetization) and also for their good chemical stability and mechanical hardness. The formation of ferrite/polymer hybrid/composite materials not only stabilized the magnetic nanoparticles (NMPs), but also gives the materials new properties. However, it was not found in the literature neither the synthesis nor the properties of manganese ferrites in polar crosslinked polymers based on methacrylic acid. The aim of this Dissertation is to produce spherical particles of crosslinked polymers with good magnetic properties based on methacrylic acid, styrene, divinylbenzene and manganese ferrites. In this work, it was synthesized compounds of manganese ferrites (MnFe2O4) scattered at copolymers of poly(methacrylic-acid-co-styrene-co-divinylbenzene) by suspension polymerization and semi-suspension polymerization. The following parameters were evaluated: contents of ferrites (1% and 5%) and concentration of suspension agent (0,2% and 5%). Moreover, it was evaluated synthesis containing organic phases (FO) pre-polymerized and mixture of the ferrite to the organic phase, previous to the stage of suspension polymerization. The copolymers were analyzed as the morphology optical microscopy; magnetic properties and distribution of ferrites at polymeric matrix VSM, SEM e EDS-X; thermal properties TGA; concentration of ferrites at polymeric matrix atomic absorption. Ferrites were evaluated as the crystallography XRD. The pre-polymerized samples and those which the ferrites were mixed at the organic phase, showed better magnetic properties and higher ferrite incorporation at polymeric matrix. No agglomeration was found in the copolymers synthesized by these routes and also the ferrite presence was minimized on the microsphere surface. All copolymers presented soft-magnetic properties as well as superparamagnetism. It was observed that raising the suspension agent concentration and reducing ferrite concentration resulted in the decrease of the microspheres diameters. TGA and DTG results showed that mixing ferrites at the organic phase rises the concentration of magnetic materials about 10%. However, only PM2550 sample, pre-polymerized and with ferrites mixed with the organic phase (5% ferrite and 0,2% PVA), presented potential application as know ferrites presence was not detected on microspheres surface, hence, magnetic materials will be protected by any external action
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Books on the topic "Manganese ferrite"

1

Miyoshi, Kazuhisa. Effect of abrasive grit size on wear of manganese-zinc ferrite under three-body abrasion. [Washington, DC: National Aeronautics and Space Administration, 1987.

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Miyoshi, Kazuhisa. Abrasion and deformed layer formation of manganese-zinc ferrite in sliding contact with lapping tapes. [Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1986.

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Pigram, A. J. The use of novel fabrication routes for the production of manganese-zinc and nickel-zinc ferrites. Manchester: UMIST, 1993.

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Book chapters on the topic "Manganese ferrite"

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Del Sol Fernández, S., Oscar F. Odio, E. Ramón-Gallegos, and Edilso Reguera. "Hybrid Manganese Spinel Ferrite Nanostructures: Synthesis, Functionalization and Biomedical Applications." In Nanohybrids in Environmental & Biomedical Applications, 141–66. Boca Raton, FL: CRC Press, Taylor & Francis Group, [2019] |: CRC Press, 2019. http://dx.doi.org/10.1201/9781351256841-6.

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Washburn, Cody, Jacob Jorne, and Santosh Kurinec. "Cathodic Electrophoretic Deposition of Ceramic Nano-Particle Manganese Zinc Ferrite." In Electrophoretic Deposition: Fundamentals and Applications II, 127–32. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-998-9.127.

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Wang, Lin, Yan-hong Li, Jin-lin Lu, Wei Xu, and Hui-long Lin. "Thermal Decomposition Kinetics of Manganese Carbonate In the Process of MnZn Ferrite Preparation." In TMS 2016: 145thAnnual Meeting & Exhibition: Supplemental Proceedings, 335–42. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274896.ch40.

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Wang, Lin, Yan-hong Li, Jin-lin LU, Wei XU, and Hui-long Lin. "Thermal Decomposition Kinetics of Manganese Carbonate in the Process of MnZn Ferrite Preparation." In TMS 2016 145th Annual Meeting & Exhibition, 335–42. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48254-5_40.

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Santos, A. A., and Ronaldo Barbosa. "Modeling Austenite-to-Ferrite Transformation Kinetics in Low-Carbon Manganese Steels during Continous Cooling." In THERMEC 2006, 4590–95. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-428-6.4590.

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Xia, Leige, Xinyu Li, Jianliang Zhang, Chaoquan Yao, Jian Guo, and Chao Zhang. "Effect of Manganese on the Formation Mechanisms of Silico-Ferrite of Calcium and Aluminum (SFCA)." In Characterization of Minerals, Metals, and Materials 2015, 549–55. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093404.ch68.

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Xia, Leige, Xinyu Li, Jianliang Zhang, Chaoquan Yao, Jian Guo, and Chao Zhang. "Effect of Manganese on the Formation Mechanisms of Silico-Ferrite of Calcium and Aluminum (SFCA)." In Characterization of Minerals, Metals, and Materials 2015, 549–55. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48191-3_68.

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Pottker, Walmir E., Patricia de la Presa, Mateus A. Gonçalves, Teodorico C. Ramalho, Antonio Hernando, and Felipe A. La Porta. "Nanocrystalline Spinel Manganese Ferrite MnFe2O4: Synthesis, Electronic Structure, and Evaluation of Their Magnetic Hyperthermia Applications." In Functional Properties of Advanced Engineering Materials and Biomolecules, 335–48. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-62226-8_12.

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Balavijayalakshmi, J., and C. Annie Josphine. "Impact of Annealing on Structural and Magnetic Properties of Manganese Co-Doped Magnesium-Cobalt Ferrite Nanoparticles." In Springer Proceedings in Physics, 233–43. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44890-9_22.

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Wang, Jia, Zijian Su, Manman Lu, Juan Wang, and Yuanbo Zhang. "Pb(II) Removal from Acidic Wastewater by Magnetic Manganese Ferrites Synthesized from Ferromanganese Ores." In The Minerals, Metals & Materials Series, 131–40. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36628-5_13.

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Conference papers on the topic "Manganese ferrite"

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Alvani, Carlo, Mariangela Bellusci, Aurelio La Barbera, Franco Padella, Marzia Pentimalli, Luca Seralessandri, and Francesca Varsano. "Reactive Pellets for Improved Solar Hydrogen Production Based on Sodium Manganese Ferrite Thermochemical Cycle." In ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/es2008-54170.

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Hydrogen production by water-splitting thermochemical cycle based on manganese ferrite /sodium carbonate reactive system is reported. Two different preparation procedures for manganese ferrite/sodium carbonate mixture were adopted and compared in terms of materials capability to cyclical hydrogen production. According to the first procedure conventionally synthesized manganese ferrite, i. e. high temperature (1250 °C) heating in Ar of carbonate/oxide precursors, was mixed with sodium carbonate. The blend was tested inside a TPD reactor using a cyclical hydrogen production/material regeneration scheme. After few cycles the mixture resulted rapidly passivated and unable to further produce hydrogen. An innovative method that avoids the high temperature synthesis of manganese ferrite is presented. This procedure consists in a set of consecutive thermal treatments of a manganese carbonate/sodium carbonate/iron oxide mixture in different environments (inert, oxidative, reducing) at temperatures not exceeding 750 °C. Such material, whose observed chemical composition consists in manganese ferrite and sodium carbonate in stoichiometric amount, is able to evolve hydrogen during 25 consecutive water-splitting cycles, with a small decrease in cyclical production efficiency.
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MUROI, M., J. AMIGHIAN, R. STREET, and P. G. McCORMICK. "SYNTHESIS OF ULTRAFINE MANGANESE-FERRITE POWDERS BY MECHANOCHEMICAL PROCESSING." In Proceedings of the First Regional Conference. World Scientific Publishing Company, 2000. http://dx.doi.org/10.1142/9789812793676_0144.

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Fukunaga, Kazuhiro, Rikio Chijiiwa, Yoshiyuki Watanabe, Akihiko Kojima, Yoshihide Nagai, Nobuhiko Mamada, Toshihiko Adachi, et al. "Advanced Titanium Oxide Steel With Excellent HAZ Toughness for Offshore Structures." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20319.

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The feature of titanium oxide steel (Ti-O steel) is that heat affected zone (HAZ) toughness is improved due to the refinement of HAZ microstructure through the formation of intragranular ferrite (IGF). This desirable microstructure, IGF, forms radially from titanium oxide particles. Recently, it has been clarified that manganese in Ti-O steel is an indispensable element for the formation of IGF. Therefore, manganese effects on Ti-O steel have been basically studied in this work, and then a new effect has been found. In Ti-O steel, manganese has the effect of suppressing the formation of ferrite side plates (FSP), which are undesirable due to their coarseness. Consequently, HAZ microstructure of Ti-O steel with high manganese content is so refined that HAZ toughness is remarkably improved. Based on the manganese effects, steel plates with excellent HAZ toughness for offshore structures have been developed and commercially mass-produced. The welded joints exhibit excellent toughness.
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Boss, Alan F., Ingrid Wilke, and Antonio C. Migliano. "Optical and Dielectric Properties of Manganese Cobalt Ferrite at Terahertz Frequencies." In Latin America Optics and Photonics Conference. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/laop.2016.lw2b.5.

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Arba, Tika Alvianuri, Utari, and Budi Purnama. "Photocatalytic property of co-precipitated manganese substituted on cobalt ferrite nanoparticles." In INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS2020). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0030386.

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Yashpreet and Bhupendra Chudasama. "Effect of annealing on structural and magnetic properties of manganese ferrite nanoparticles." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017142.

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Kumar, Atul, Bharti, Satya Dev, Sardul Singh Dhayal, Rajesh Thakur, Rakesh Dhar, and Surender Duhan. "Effect of thermally evaporated manganese ferrite thin film on bacterial biofilm formation." In 3RD INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001803.

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Hiratsuka, N., T. Miyazaki, K. Kakizaki, O. H. Kwon, and B. C. Soo. "Epitaxial growth of [111] oriented manganese zinc ferrite thin films their magnetic properties." In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837779.

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Zhao, Hui, Xuehan Li, and Haitao Zhao. "Effect of Reaction Conditions on the Morphology and Properties of Manganese Zinc Ferrite." In 2020 3rd International Conference on Electron Device and Mechanical Engineering (ICEDME). IEEE, 2020. http://dx.doi.org/10.1109/icedme50972.2020.00121.

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Pourkia, Navid, Pirooz Marashi, Rouzbeh Leylabi, Seyed Alireza Tabatabaei, and Hadi Torshizi. "The Effect of Weld Metal Manganese Content on the Microstructure, Mechanical Properties and Hot Crack Susceptibility of Helically Welded Linepipes." In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64152.

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The effect of manganese addition on decreasing hot crack susceptibility of submerged arc welding in microalloyed steels is well understood, but its increment should not cause unsuitable changes in metallurgical and mechanical properties of weld metal. Therefore, since weld metal Mn content in SAW process is mainly controlled by welding wire composition, the aim of this investigation is to study the effect of wire Mn content on the microstructure, mechanical properties and hot crack susceptibility of helical linepipes weld metal. In this regard, three different wires with 0.88, 1.05 and 1.54 wt% of Mn content were selected and welding was performed in both experimental and production process condition of X70 helical linepipes. As a result, 1.26, 1.44 and 1.67 wt% of Mn in weld metal was obtained respectively. Metallographical examinations using optical and scanning electron microscopy showed that, increasing the amount of Mn in weld metal, decrease the grain size of all phases (acicular ferrite, primary ferrite and ferrite with aligned second phase). Moreover, in the expense of increasing acicular ferrite, the volume fraction of primary ferrite (mostly grain boundary ferrite) and ferrite with aligned second phase decreased. Also, the results of mechanical properties indicated that the higher the amount of Mn, the higher the strength and hardness of weld metal, but in the case of impact toughness and tensile elongation, an optimum level was observed and lower toughness in the highest Mn content weld metal is attributed to the increasing hardenability and thus formation of martensite/retained austenite islands and grain boundary carbides in coincident sites of acicular ferrite grains. Moreover, analyzes in more than 1000m helical linepipes weld metal length showed that increasing weld metal Mn content up to 1.4wt%, reduced the possibility of hot crack formation from total percentage of 0.005 to around 0.001.
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Reports on the topic "Manganese ferrite"

1

Gentscheva, Galia, Paunka Vassileva, Nikolay Marinkov, Christina Tzvetkova, and Daniela Kovacheva. Investigation of the Possibility for Removal of Hexavalent Chromium Using Manganese Ferrite Nanoparticles. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, September 2020. http://dx.doi.org/10.7546/crabs.2020.09.06.

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Koretsky, Carla. Development of Surface Complexation Models of Cr(VI) Adsorption on Soils, Sediments and Model Mixtures of Kaolinite, Montmorillonite, γ-Alumina, Hydrous Manganese and Ferric Oxides and Goethite. Office of Scientific and Technical Information (OSTI), November 2013. http://dx.doi.org/10.2172/1108224.

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