Relevant bibliographies by topics / Hexaferrites

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  2. Dissertations / Theses
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  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Hexaferrites'

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

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Journal articles on the topic "Hexaferrites"

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Lisjak, Darja, Darko Makovec, and Miha Drofenik. "Formation of U-type hexaferrites." Journal of Materials Research 19, no. 8 (2004): 2462–70. http://dx.doi.org/10.1557/jmr.2004.0317.

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The formation of U-type hexaferrites with the composition Ba4B2Fe36O60 (B = Co, Ni, Zn) was studied. Samples were characterized by means of x-ray diffraction, electron microscopy (with energy-dispersive spectroscopy), and thermogravimetric and thermomagnetic analyses. U-hexaferrites are formed from the intermediate phases M-hexaferrite (BaFe12O19) and Y-hexaferrite (Ba2B2Fe12O22), which at the same time represent units in the U-hexaferrites’ crystal structure. The preparation of monophase U-hexaferrites was made possible by combining high-energy milling or chemical coprecipitation with a calcination at 1250–1300 °C. Structural defects, such as stacking faults, were observed in monophase samples with a high-resolution transmission electron microscope. The observed defects can be regarded as seeds for the formation of other hexaferrite phases after prolonged calcination times or higher calcination temperatures.
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Jotania, Rajshree B., and Hardev Singh Virk. "Y-Type Hexaferrites: Structural, Dielectric and Magnetic Properties." Solid State Phenomena 189 (June 2012): 209–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.189.209.

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This paper attempts to provide a historical survey of structure of various types of hexaferrites. It provides information about synthesis, characterization, structural, magnetic and dielectric properties of Y-type hexagonal ferrites using various chemical routes. We have prepared a series of cobalt doped Sr2Cu2-xCoxFe12O22(x = 0.0 to 1.0) hexaferrites using a wet chemical co-precipitation technique. The prepared hexaferrite precursors were calcined at 950 °C for 4 hours in a furnace and slowly cooled to room temperature. The crystal structure of Y-type hexaferrites is rather complicated. The chemical and structural changes were examined in detail by X-ray diffraction (XRD), Differential scanning calorimetry (DSC), Scanning electron microscopy (SEM), and Fourier transform infra-red (FTIR) spectroscopy. X-ray diffraction studies showed that sintering temperature as low as 950°C was sufficient to produce a single-phase Y-type hexaferrite material. The dielectric measurements were carried out over the frequency range of 100 Hz to 2 MHz at room temperature using an LCR meter to study the variation of dielectric constant and loss tangent with frequency. The magnetic properties of hexaferrite samples were investigated using a vibration sample magnetometer (VSM), and a superconducting quantum interference device (SQUID) magnetometer in the temperature range 30K to 200K. A change from ferromagnetic state to super paramagnetic state has been observed in Co doped Sr2Cu2-xCoxFe12O22(x= 0.6 to 1.0) hexaferrite. The novel applications of all types of hexaferrite materials have been described.
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Liu, Yue, Yang Li, Ying Liu, et al. "Structure Information of Barium Hexaferrite and Strategies for its Syntheses." Applied Mechanics and Materials 69 (July 2011): 6–11. http://dx.doi.org/10.4028/www.scientific.net/amm.69.6.

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Structure information of barium hexaferrite is very important in designing higher efficient synthetic methods and in tailoring the magnetic properties of barium hexaferrite by doping. The structure information of M-type barium hexaferrite has helped to find new efficient routes of hydrothermal and co-precipitation methods in synthesizing barium hexaferrites and in altering their magnetic properties by doping.
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Nandotaria, Reshma A., Chetna C. Chauhan, and Rajshree B. Jotania. "Effect of Non-Ionic Surfactant Concentration on Microstructure, Magnetic and Dielectric Properties of Strontium-Copper Hexaferrite Powder." Solid State Phenomena 232 (June 2015): 93–110. http://dx.doi.org/10.4028/www.scientific.net/ssp.232.93.

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Strontium copper hexaferrite powder with composition Sr2Cu2Fe12O22 was synthesized in presence of a non-ionic surfactant Tween-80 using chemical co-precipitation route. The prepared samples were calcinated at 950 oC for 4 hrs in a furnace and then slowly cooled to room temperature to obtain Sr2Cu2Fe12O22 hexaferrite powder. The effect of surfactant concentration on phase formation, microstructure, magnetic and dielectric properties of Sr2Cu2Fe12O22 were investigated using XRD, SEM, TEM, VSM, dielectric and low field AC susceptibility measurement techniques. The XRD analysis reveals the formation of mixed phases of Y and M type hexaferrites. The synthesized samples exhibited magnetic properties typical for soft magnetic materials, with saturation magnetization typical for Y-type hexaferrites. The dielectric properties were studied within the frequency range 100 HZ to 2 MHz. SEM images show formation of non-uniform, spongy and porous structure. The low field AC susceptibility measurements indicate that formed Sr-Cu hexaferrite powder possesses ferrimagnetic to paramagnetic transition at Curie temperature.
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Alhmoud, Lina, Abdul Raouf Al Dairy, Hossam Faris, and Ibrahim Aljarah. "Prediction of Hysteresis Loop of Barium Hexaferrite Nanoparticles Based on Neuroevolutionary Models." Symmetry 13, no. 6 (2021): 1079. http://dx.doi.org/10.3390/sym13061079.

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Neuroevolutionary models are used to predict magnetic hysteresis for barium hexaferrites (to predict magnetic hysteresis for barium hexaferrites). Magnetic hysteresis for a specific set of samples of barium hexaferrite doped with titanium were measured experimentally at room temperature and reported before. Neural networks are trained using these experimental data in order to generate magnetization and predict magnetic hysteresis for various concentrations of titanum. We present the prediction for various methods of neural calculations and the deviations from actual data results were negligible. Finally, the predictions of magnetic hysteresis are summerized for the titanume concentration between 0.0 and 1.0.
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CAI, S., P. H. XIN, P. F. WANG, et al. "THE SOL–GEL SYNTHESIS OF RARE-EARTH IONS SUBSTITUTED BARIUM HEXAFERRITES AND MAGNETIC PROPERTIES." Modern Physics Letters B 27, no. 26 (2013): 1350192. http://dx.doi.org/10.1142/s0217984913501923.

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In this paper, a series of rare-earth-doped barium hexaferrite powders ( Ba 0.95 Re 0.05- Fe 12 O 19 and Ba 0.95 Re 0.05 M 0.05 Fe 11.95 O 19: Re = La , Pr , Sm , Nd , Gd , Dy , Yb ; M = Zn 2+, Mn 2+, [Formula: see text]) were synthesized by the sol–gel self-combustion technology. The phase composition and the magnetic properties of the as-prepared barium hexaferrites were characterized and discussed with X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The results showed that the barium hexaferrites exhibited the magnetoplumbite phase structure with the average diameter of 45 nm. Magnetic properties study revealed that the variation of the saturation magnetization (Ms) was similar with the change of the rare-earth ions radius, but the change of Ms was low. This indicated that the magnetic moments of rare-earth ions could not affect Ms. The magnetocrystalline anisotropy field mainly influenced the anisotropism of hexaferrites, and the coercivity (Hc) of the rare-earth ions doped barium hexaferrites basically decreased with the increasing orbital quantum numbers (except Sm 3+ and Gd 3+). Further study showed the co-addition of Zn 2+ and Mn 2+ did not change the trend of Ms and Hc. Thus, it is concluded that the rare-earth ions played an important role for the anisotropy field of barium hexaferrites.
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Костишин, В. Г., В. В. Коровушкин, И. М. Исаев та ін. "Особенности катионного распределения и магнитных свойств гексаферритов BaFe-=SUB=-12-x-=/SUB=-Y-=SUB=-x-=/SUB=-О-=SUB=-19-=/SUB=-". Физика твердого тела 63, № 2 (2021): 229. http://dx.doi.org/10.21883/ftt.2021.02.50468.187.

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BaYxFe12-хO19 (0.1 ≤ x ≤ 1.2) hexaferrites were studied using Mössbauer spectroscopy, magnetometry, and X-ray diffraction. A low isomorphic capacity of hexaferrite is shown, which at x = 0.6 leads to phase separation with the formation of BaFe2O4 and Y3Fe5O12 impurity phases. The data of Mössbauer spectroscopy showed that the Y3 + ions occupied the 12k position with the formation of the nonequivalent position 12k ′ due to the breaking of two magnetic bonds Fe (12k) - O - Fe (12k) in the triad of octahedra 12k with their replacement by Fe (12k ) - O - Y (12k). It is shown that BaYxFe12-хO19 hexaferrites are less magnetically hard than BaFe12-хAlxO19.
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Pereira, F. M. M., and A. S. B. Sombra. "A Review on BaxSr1-xFe12O19 Hexagonal Ferrites for use in Electronic Devices." Solid State Phenomena 202 (May 2013): 1–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.202.1.

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The Ferrite term is used to refer to all magnetic oxides containing iron as major metallic component which has great to technological applications because of their ferromagnetic and insulating properties at room temperature. Among such ferrites, the hexagonal ones (hexaferrites) have long been used for permanent magnets and are of interest for microwave applications. The hexaferrite M-type has a structure built up from the S blocks interposed by the R block and are symbolically described as RSR*S*. In the last decades there has been great interest in the hexaferrites M-Type for applications as electronic components for mobile and wireless communications at microwave/GHz frequencies, electromagnetic wave absorbers for electromagnetic compatibility (EMC), radar absorting material (RAM) and stealth technologies and as composite materials. This review aimed study the structure, magnetic and dielectric properties of the hexaferrite BaxSr1-xFe12O19, which is a promising material for electronic devices and for small dielectric resonator antennas (MRA).The outline of this Review Paper is as follows:
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Kikuchi, Takeyuki, Shinji Yoshida, Tatsuya Nakamura, et al. "Synthesis of U-Type Strontium Hexaferrite by Polymerizable Complex Method." Key Engineering Materials 566 (July 2013): 227–30. http://dx.doi.org/10.4028/www.scientific.net/kem.566.227.

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Synthesis of U-type hexaferrite was investigated in the various strontium-based systems (Sr-Me-Fe-O system, Me = Co, Zn, Cu, and Ni). Precursors of ferrites were prepared by polymerizable complex method. Sr4Me2Fe36O60 (Me = Co and Zn) U-type hexaferrites were synthesized at the temperature range between 1423 and 1483 K in air. Coercivity of obtained ferrite was decreased with increasing heat treatment temperatures. Cu substitution reduced formation temperature of U-type hexaferrite.
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Pullar, Robert C. "Hexagonal Ferrite Fibres and Nanofibres." Solid State Phenomena 241 (October 2015): 1–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.241.1.

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Hexagonal ferrites, or hexaferrites, are hugely important materials commercially and technologically, with common applications as permanent magnets, magnetic recording and data storage media, components in electrical devices operating at wireless frequencies, and as GHz electromagnetic wave absorbers for EMC, RAM and stealth technologies. Hexaferrites are all ferrimagnetic materials, and their magnetic properties are intrinsically linked to their crystalline structures, all having a strong magnetocrystalline anisotropy; that is the induced magnetisation has a preferred orientation within the crystal structure. They can be divided into two main groups: those with an easy axis of magnetisation (known as uniaxial), the hard hexaferrites, and those with an easy plane (or cone) of magnetisation (known as ferroxplana or hexaplana), soft ferrites. The common hexaferrite members are:M-type ferrites, such as BaFe12O19and SrFe12O19Z-type ferrites (Ba3Me2Fe24O41)Y-type ferrites (Ba2Me2Fe12O22)W-type ferrites (BaMe2Fe16O27)X-type ferrites (Ba2Me2Fe28O46)U-type ferrites (Ba4Me2Fe36O60)where Me = a small 2+ion such as cobalt, nickel or zinc, and Ba can be fully substituted by Sr. Generally, the M ferrites are hard, the Y, Z and U ferrites are soft, and the W and X ferrites can very between these two extremes, but all have large magnetisation (M) values.There is currently increasing interest in composite materials containing hexaferrite fibres. It had been predicted that properties such as thermal and electrical conductivity, and magnetic, electrical and optical behaviour will be enhanced in material in fibrous form. This is because a continuous fine fibre can be considered as effectively one-dimensional, and it does not behave as a homogeneously distributed solid. Although the intrinsic magnetisation of the material is unaffected, the effective magnetisation of an aligned fibre sample should be greater when a field is applied parallel with fibre alignment compared to when applied perpendicularly to fibre alignment. This feature was first demonstrated by the author for aligned hexaferrite fibres in 2006. This chapter will deal with progress in the manufacture and properties of hexaferrite fibres, from the first syntheses of BaM, SrM,Co2Y,Co2Z, Co2W, Co2X and Co2U micron-scale fibres by the author 12-15 years ago, to recent developments in M ferrite hollow fibres and nanofibres, and hexaferrite-coated CNTs (carbon nanotubes).The relative properties of all reported hexaferrite fibres are compared and summarised at the end of this chapter.
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Dissertations / Theses on the topic "Hexaferrites"

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Appleton, Stephen George. "The production and analysis of BaFe12 O19 for microwave applications." Thesis, University of Portsmouth, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384905.

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This thesis describes a study into the production of polycrystalline BaFe120 19 (BaM) specimens possessing properties appropriate to microwave device applications. Principal requirements were controlled stoichiometry, single-crystal density and a high degree of crystallographic alignment; all of these contributing to the reduction of ferromagnetic resonance (FMR) losses and linewidths to levels comparable with more expensive single-crystal alternatives. The stoichiometry of precursor BaM powder was analysed by X-ray diffraction (XRD) and found to be critically dependent on reaction conditions and batch reproducibility of constituent chemicals. The reaction process of BaM was analysed in the temperature range 500 - 1200 °C and phase content elucidated. The XRD spectrum of the single-phase BaM contained peaks not in the powder diffraction file (PDF) for this compound. Careful analysis eliminated the possibility of impurities and second phases. A comprehensive theoretical calculation from first principles allowed a complete fit between the calculated and observed XRD spectra. A revised spectrum has been proposed to the Joint Committee on Powder Diffraction Standards (JCPDS) in order to improve the PDF data reported by earlier workers. Adaptation of the theory has enabled the development of a tool for the determination of site preferences of dopant systems, such as Zn2+ -Ti4+ pairs. A novel magnetic press system was devised and constructed for the simultaneous alignment and compaction of powders in an aqueous slurry. Sintering of compacts resulted in relative densities up to 95 % coupled with improved alignment through grain growth. In an improved technique, aligned compacts were pre-sintered and hot-pressed in an oversize die, allowing viscous flow of grains. Near 100 % relative densities were obtained at temperatures significantly lower than for conventional sintering. Alignment was enhanced by subsequent annealing, but did not exceed levels achieved by normal sintering. Suggestions were made for achieving higher alignments. Microwave resonance linewidths were significantly lower than for isotropic polycrystals and suggestions for further improvements were identified.
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Alipanah, Razieh. "Structure development in sol-gel derived barium hexaferrites." Thesis, University of Warwick, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402998.

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Labeyrie, Michèle. "Contribution à l'étude des hexaferrites pour ondes millimétriques." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606768c.

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Labeyrie, Michèle. "Contribution à l'étude des hexaferrites pour ondes millimétriques." Paris 11, 1987. http://www.theses.fr/1987PA112515.

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Les ferrites hexagonaux de type M en raison de leur forte anisotropie magnétocristalline uniaxiale sont des matériaux potentiellement intéressants dans le domaine des ondes millimétriques. Les performances des dispositifs utilisant ces matériaux dépendent des pertes magnétiques et diélectriques du ferrite à la fréquence de travail du système. On a mis au point des méthodes de mesures permettant de déterminer les pertes magnétiques à la résonance ferromagnétique et les pertes diélectriques dans la bande 90 - 100 GHz entre les températures de 100 K et 400 K. La mesure des pertes magnétiques hors résonance à 94 GHz est également décrite. La détermination du champ d'anisotropie est aussi présentée ; à la température ambiante, elle utilise la transition de 1'état monodomaine à l'état multidomaine suivant la valeur du champ appliqué. Ces différentes techniques ont permis de caractériser des échantillons d'hexaferrite de baryum BaFe12019, de strontium SrFe12019, ou d'hexa­ ferrite substitués (A1, ZnTi) obtenus par croissance à partir d'un flux. La variation avec la température des pertes magnétiques et diélectriques mesurées sur les hexaferrites non substitués indique qu’à 94 GHz la contribution essentielle aux pertes résulte de mécanismes intrinsèques : interaction phonon-magnon pour les pertes magnétiques, interaction phonon-polariton pour les pertes diélectriques.
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O'Neill, Marie Colette. "Investigations of barium and strontium hexaferrites for magneto-optic applications." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361273.

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Beevers, J. E. "Magnetic X-ray spectroscopy studies of PLD grown magnetoelectric hexaferrites." Thesis, University of York, 2018. http://etheses.whiterose.ac.uk/21469/.

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The work here in was undertaken with two main objectives. The first has been to design and develop a bespoke pulsed laser deposition growth system to enable the growth of high quality transition metal oxide thin films. The system has been constructed to allow for the growth of multi-block or layered systems, such as the R, S and T-blocks of hexaferrites, by utilising an alternating target approach. Ultimately, the growth system’s ability to grow complex oxide thin films has been tested and the successful growth of an epitaxial M-type hexaferrite, with material properties that compare well to the literature, has been realised. Additionally, the magnetoelectric effect in M-type Ti-Co doped strontium hexaferrite, SrCo2Ti2Fe8O19, has been studied using a combination of magnetometry and element specific soft x-ray spectroscopies. A large increase (>30x) in the magnetoelectric coefficient is found when Co2+ enters the trigonal bi-pyramidal site. The 5-fold trigonal bi-pyramidal site has been shown to provide an unusual mechanism for electric polarization based on the displacement of magnetic transition metal ions. For Co entering this site, an off-centre displacement of the cation may induce a large local electric dipole as well as providing an increased magnetostriction enhancing the magnetoelectric effect.
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JALQUIOD, LOUISON CATHERINE. "Proprietes hyperfrequences et relaxation dans les hexaferrites polycristallins co#2z." Université Louis Pasteur (Strasbourg) (1971-2008), 1994. http://www.theses.fr/1994STR13348.

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Cette etude vise a la comprehension du comportement hyperfrequence de ferrites polycristallins orientes a foret anisotropie planaire. Dans un premier chapitre, nous rappelons les mecanismes fondamentaux, dans ces materiaux, a l'origine des phenomenes d'absorption des ondes electromagnetiques: gyromagnetisme et contribution de parois. Nous abordons ensuite les problemes de relaxation du gyromagnetisme et les processus physiques a l'origine des pertes. L'influence des conditions d'elaboration du ferrite ba#3co#2fe#2#4o#4#1(ou co#2z) choisi comme materiau d'etude, est suivie dans le but de realiser le materiau le plus adapte a l'etude des phenomenes d'amortissement. L'influence de ces conditions sur le comportement hyperfrequence est ensuite analysee. Elle met en evidence l'effet preponderant de la teneur en fer divalent dans le ferrite. Le modele de pur gyromagnetisme generalement admis, est alors remis en cause. L'evolution du comportement observee est attribuee a une contribution supplementaire de relaxation de parois. Celle-ci serait due a des variations locales d'anisotropie magnetique associees a la presence du fer divalent. Dans une derniere partie, un chemin de relaxation particulier est etudie. Il concerne l'influence de l'insertion de terres rares dans la maille sur les proprietes magnetiques statiques et dynamiques du ferrite
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AUTISSIER, DENIS. "Amelioration des proprietes des hexaferrites comme absorbants micro-onde par perfectionnement de la microstructure." Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13170.

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Dans la premiere partie du memoire, nous presentons les phenomenes physiques contribuant a l'absorption des ondes electromagnetiques dans une plage donnee de frequences, et nous montrons l'interet potentiel des hexaferrites pour cette application. Nous dressons ensuite l'etat des connaissances a propos des hexaferrites planaires. Nous exposons dans une deuxieme partie les methodes experimentales utilisees au cours de cette etude: synthese de la poudre par chamottage ou methode chimique, mise en forme par une methode originale de coulee en barbotine sous champ magnetique, traitements thermiques complexes de frittage. Les resultats obtenus sur trois compositions obtenus sur trois compositions caracteristiques sont ensuite donnes, en insistant sur les proprietes magnetiques, en particulier la relativite des contributions de parois et de gyromagnetisme
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Silva, Júnior Flávio Moura e. "Fônons em hexaferritas Ba2Me2Fe12O22 (Me= Co, Mg e Zn) e BaFe12O19." Universidade Federal do Maranhão, 2016. http://tedebc.ufma.br:8080/jspui/handle/tede/1594.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-06-07T21:13:51Z No. of bitstreams: 1 FlavioMouraSilva.pdf: 12265404 bytes, checksum: 15367785bb1dabbe1c0f6398c05ce1c2 (MD5)<br>Made available in DSpace on 2017-06-07T21:13:51Z (GMT). No. of bitstreams: 1 FlavioMouraSilva.pdf: 12265404 bytes, checksum: 15367785bb1dabbe1c0f6398c05ce1c2 (MD5) Previous issue date: 2016-08-31<br>Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA)<br>In this study we investigated the hexaferrites type Y Ba2(Mg1-xCox)2Fe12O22 (x = 0; 0.2; 0.4; 0.6; 0.8 and 1), Ba2Zn2Fe12O22 (Zn2Y) and type M BaFe12O19 (BaM). The experimental techniques used were the X-ray diffraction, XANES (X-ray Absorption Near Edge Structure), XPS (X-ray Photoelectron Spectroscopy), Specular Reflectance IR Spectroscopy, Raman Spectroscopy, Magnetometry and Impedance Spectroscopy. The investigated samples were synthesized by ceramic conventional method. The results of X – ray diffraction confirmed to obtain the desired phase with a small amount of subphases, except for BaM did not show traces of impurities or subphases. XANES and XPS measurements indicated a predominance of 3+ valence for Fe ion and the presence of the 2+ and 3+ oxidation states to Co ions in the samples containing cobalt. As for measures of Raman spectroscopy and reflectance speculate at room temperature it was possible to classify the main bands, qualitatively, making a comparison of the spectra measured with ferrites spectra reported in the literature. From this analysis it was possible associate the high-frequency bands (560-700 cm -1) and low frequency bands (<130 cm-1) with vibration tetrahedra (Mg, Co and Zn)O4 and Ba-O, respectively. As for the system Ba2(Mg1-xCox)2Fe12O22, the specular reflectance spectra and X-ray diffraction patterns showed no appreciable change with magnesium substitution by cobalt, showing no change of space group in the samples due to this substitution. Analysis of the Raman spectra of this system showed that the bands shift to low frequency regions as it grows cobalt content in the structure and new bands at 623 cm-1 and 459 cm-1 appear, which are due to vibration Co-O bonds. Anomalies were observed in the phonon parameters (frequency, width and intensity) in Raman spectroscopy measurements at high and low temperatures in Ba2Mg2Fe12O22 (Mg2Y) samples, Ba2Zn2Fe12O22 (Zn2Y) and BaFe12O19 (BaM) at temperatures where they exhibit magnetic phase transitions. With the aid of additional magnetic measurements, we analyze these results in terms of the spin-phonon coupling. Furthermore, the observation of spin-phonon coupling in the low temperature on Mg2Y suggested magnetostriction as magnetoelectricity mechanism for this material. The electrical measurements on Mg2Y showed that the relaxation process is due to conductive mechanisms being thermally activated and showed grain and grain boundary contributions to the impedance of the sample.<br>Neste trabalho foram investigadas as hexaferritas tipo Y Ba2(Mg1-xCox)2Fe12O22 (x=0; 0,2; 0,4; 0,6; 0,8 e 1), Ba2Zn2Fe12O22 (Zn2Y) e tipo M BaFe12O19 (BaM). As técnicas experimentais utilizadas foram a Difração de raios X, XANES (X-ray Absortion Near Edge Structure), XPS (X-ray Photoelectron Spectroscopy), Espectroscopia no Infravermelho por Refletância Especular, Espectroscopia Raman, Magnetometria e Espectroscopia de Impedância. As amostras investigadas foram sintetizadas por método convencional cerâmico. Os resultados de difração de raios X confirmaram a obtenção das fases pretendidas com uma pequena quantidade de subfases, exceto para BaM que não apresentou traços de impurezas ou subfases. Medidas XANES e XPS indicaram uma redominância a valência 3+ para o Íon Fe e a presença dos estados de oxidação 2+ e 3+ para os Íons Co nas amostras que contém cobalto. Quanto ¾s medidas de Espectroscopia Raman e Refletância Especular ¾ temperatura ambiente foi possível classificar a principais bandas, de forma qualitativa, fazendo um comparativo dos espectros medidos com os espectros de ferritas reportados na literatura. Dessa análise foi possível associar as bandas de alta frequência (560-700 cm-1) e as bandas de baixa frequência (<130 cm-1) ¾s vibrações de tetraedros (Mg, Co e Zn)O4 e de Ba-O, respectivamente. Quanto ao sistema Ba2(Mg1-xCox)2Fe12O22, os espectros de refletância especular e padrões de difração de raios X não apresentaram mudanças apreciáveis com a substituição de magnésio por cobalto, mostrando que não há mudança de grupo espacial nas amostras devido a essa substituição. A análise dos espectros Raman desse sistema, mostrou que as bandas se deslocam para regiões de baixa frequência ¾ medida que cresce o teor de cobalto na estrutura e que novas bandas em 623 cm-1 e 459 cm-1 surgem, sendo estas devido ¾ vibração de ligações Co-O. Foram observadas anomalias nos parâmetros de fônons (frequência largura e intensidade) nas medidas de espectroscopia Raman em altas e baixas temperaturas nas amostras Ba2Mg2Fe12O22 (Mg2Y), Ba2Zn2Fe12O22 (Zn2Y) e BaFe12O19 (BaM) em temperaturas nas quais estas exibem transições de fase magnética. Com o auxílio de medidas magnéticas complementares, analisamos tais resultados em termos do acoplamento spin-fônon. Além disso, a observação do acoplamento spin-fônons em baixa temperatura na Mg2Y sugeriu a magnetostrição como mecanismo de magnetoeletricidade para este material. As medidas elétricas na Mg2Y mostraram que o processo de relaxação se deve a mecanismos condutivos termicamente ativados e revelaram contribuições de grão e contorno de grão para a impedância da amostra.
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Thompson, Simon. "Synthesis and characterisation of hexaferrites with magnetoplumbite structure for application to novel hybrid structural fibres." Thesis, Nottingham Trent University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429393.

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Books on the topic "Hexaferrites"

1

Ataie, Abolghasem. Hydrothermal synthesis and characterisation of barium and strontium hexaferrites. University of Birmingham, 1995.

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Ebrahimi, Seyyed Ali Seyyed. Processing, characterisation and optimisation of gas treated M - type strontium hexaferrite. University of Birmingham, 1998.

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Reid, Theresa. Magnetic and magneto-optical study of oriented barium and strontium hexaferrite films. University of Salford, 1995.

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Wang, Jianfeng. A study of rare earth element substituted strontium hexaferrite produced by chemical co-precipitation and hydrothermal synthesis. University of Birmingham, 2003.

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Mahmood, Sami H., and Ibrahim Abu-Aljarayesh. Hexaferrite Permanent Magnetic Materials. Materials Research Forum LLC, 2016.

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Book chapters on the topic "Hexaferrites"

1

Panchal, N. R., and R. B. Jotania. "Influence of Surfactant in Hexaferrites as Wear Resistance." In Lecture Notes in Mechanical Engineering. Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1656-8_15.

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Singh, Anterpreet, S. Bindra Narang, Kulwant Singh, and R. K. Kotnala. "Dielectric Properties of Rare Earth Doped Sr-M Hexaferrites." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470528990.ch18.

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Rane, Manisha V., D. Bahadur, A. K. Nigam, and C. M. Srivastava. "Investigation of Site Occupation in Non-Stoichiometric Ni-Zr Substituted Barium Hexaferrites." In Metal Matrix Composites and Metallic Foams. Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527606203.ch6.

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Han, Zhi Dong, Li Min Dong, Ze Wu, Lian Wei Shan, and Xian You Zhang. "Synthesis of La-Mn Substituted M-Type Ba Hexaferrites by Sol-Gel Method." In Key Engineering Materials. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.688.

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Sharma, Puneet, R. A. Rocha, S. N. de Medeiros, A. Paesano, and B. Hallouche. "Structural, Mössbauer and magnetic studies on Mn-substituted barium hexaferrites prepared by high energy ball milling." In LACAME 2006. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-85559-0_12.

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Lisjak, Darja, Andrej Žnidaršić, Vladimir B. Bregar, and Miha Drofenik. "Compatibility Studies of Z- and Y-Type BaCo Hexaferrites for Low-Temperature Co-Firing with Ag." In Advances in Science and Technology. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.2539.

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Drofenik, Miha, M. Kristl, Andrej Žnidaršić, and Darja Lisjak. "Barium Hexaferrite Prepared by Hydrothermal Synthesis." In Materials Science Forum. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-441-3.183.

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Patel, Hasmukh A., Jeehye Byun, and Cafer T. Yavuz. "Arsenic removal by magnetic nanocrystalline barium hexaferrite." In Nanotechnology for Sustainable Development. Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-05041-6_13.

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Nakamura, Shin, Yorihiko Tsunoda, and Akio Fuwa. "Mössbauer study on Y-type hexaferrite Ba2Mg2Fe12O22." In ICAME 2011. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-4762-3_108.

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Pignard, S., H. Vincent, M. Audier, et al. "Hexaferrite and Manganite Films Obtained by Injection - MOCVD Process." In Nano-Crystalline and Thin Film Magnetic Oxides. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4493-3_4.

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Conference papers on the topic "Hexaferrites"

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Костишин, V. Kostishin, Читанов, et al. "Using of ltcc-technology to obtain hexagonal ferrites for substrates microstrip devices microwave electronics mm-range of wavelengths." In XXIV International Conference. Infra-m, 2016. http://dx.doi.org/10.12737/23271.

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Abstract:
In the work by the method low temperature co-fired ceramics (LTCC) obtained samples of isotropic and anisotropic polycrystalline hexaferrite BaFe12O19 and SrFe12O19. Using in the LTCC-technology the pressing operation for samples (tablets) in a magnetic field produces anisotropic hexaferrites, pressing without a magnetic field - isotropic hexaferrites. Application in the LTCC-technology molding process tape produces exclusively isotropic samples.
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Kostenko, V. I., A. I. Pyatnitsa, A. M. Sorochak, T. G. Chamor, and L. V. Chevnyuk. "High-frequency hysteresis in uniaxial hexaferrites." In 2010 20th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo 2010). IEEE, 2010. http://dx.doi.org/10.1109/crmico.2010.5632853.

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Belevtsev, Andrei M., Sergej V. Serebryannikov, Anatoliy P. Cherkasov, et al. "Impedance matching materials based on barium hexaferrites." In Millimetre Wave and Terahertz Sensors and Technology, edited by Neil A. Salmon and Frank Gumbmann. SPIE, 2018. http://dx.doi.org/10.1117/12.2513305.

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Horak, T., M. Vanwolleghem, G. Ducournau, K. Postava, P. Kolejak, and J. F. Lampin. "Magneto-optical hexaferrites for terahertz isolating applications." In 2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2016. http://dx.doi.org/10.1109/irmmw-thz.2016.7758377.

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Dubey, Pralekh, Rajveer Kaur, and S. S. Ghumman. "Magnetoelectric multiferroic, y-type hexaferrites – A review." In ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2020): 5th National e-Conference on Advanced Materials and Radiation Physics. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0052452.

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Lisjak, D., and M. Drofenik. "The formation of barium hexaferrites using coprecipitation methods." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1464398.

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Chamor, T. G., L. V. Chevnyuk, A. Yu Gorpynyuk, and V. I. Kostenko. "Hybrid oscillations in composite resonators with uniaxial hexaferrites." In 2008 Microwaves, Radar and Remote Sensing Symposium (MRRS). IEEE, 2008. http://dx.doi.org/10.1109/mrrs.2008.4669557.

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Doyan, A., Susilawati, M. Taufik, and Wahyudi. "Electrical properties of M-type barium hexaferrites (BaFe12ZnMnO19)." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015695.

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Chamor, T. G., L. V. Chevnyuk, V. I. Kostenko, V. F. Romanyuk, and A. M. Sorochak. "Reversal magnetization process in the monocrystalline samples of strontium hexaferrites." In Telecommunication Technology" (CriMiCo 2008). IEEE, 2008. http://dx.doi.org/10.1109/crmico.2008.4676500.

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Kostenko, V., T. Chamor, L. Chevnyuk, and A. Sorochak. "Thickness Dependences of Ferromagnetic Resonance in Single-Axis Barium Hexaferrites." In 2006 16th International Crimean Microwave and Telecommunication Technology. IEEE, 2006. http://dx.doi.org/10.1109/crmico.2006.256124.

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Reports on the topic "Hexaferrites"

1

Penn, R. L., J. F. Banfield, and J. Voigt. Synthesis of nanocrystalline barium-hexaferrite from nanocrystalline goethite using the hydrothermal method: Particle size evolution and magnetic properties. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/459417.

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Hong, Yang-Ki, Timothy Haskew, Oleg Myryasov, Sungho Jin, and Ami Berkowitz. Rare-Earth-Free Permanent Magnets for Electrical Vehicle Motors and Wind Turbine Generators: Hexagonal Symmetry Based Materials Systems Mn-Bi and M-type Hexaferrite. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1133257.

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