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Journal articles on the topic 'Strontium ferrite'

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Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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1

de Campos, Marcos Flavio, and Daniel Rodrigues. "High Technology Applications of Barium and Strontium Ferrite Magnets." Materials Science Forum 881 (November 2016): 134–39. http://dx.doi.org/10.4028/www.scientific.net/msf.881.134.

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Ceramic magnets as barium ferrite or strontium ferrite have many applications in high technology. One of the reasons is the low cost when compared to competitor materials, as Alnico, MnBi, MnAl or NdFeB. In this study, the advantages and disadvantages of Ba and Sr ferrite magnets are discussed. One clear advantage is that ferrites are already oxides, and do not present the corrosion problems typical of NdFeB and other metallic alloys. As ferrites are oxides, the processing is much easier and cheaper. For example sintering can be done at air, and milling under wet condition. One of the main conclusions is the excellent ratio cost/benefit of ferrites, giving advantage in many applications. Special attention is given for application of ferrites in high efficiency motors.
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2

Huang, Shi Feng, Xue Li, Fu Tian Liu, Ya Mei Liu, Xin Cheng, and Zong Jin Li. "Influence of Strontium Ferrite on Properties of 0-3 Cement-Based Piezoelectric Composites." Key Engineering Materials 400-402 (October 2008): 125–29. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.125.

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0-3 cement based piezoelectric composites were fabricated using sulphoaluminate cement as matrix by compressing technique method. The effects of strontium ferrite content on the piezoelectric properties, dielectric properties and acoustic impedance of the composites were studied. The results show that the piezoelectric strain constant d33 and piezoelectric voltage constant g33 of the composites increase gradually with increaing strontium ferrite content. When the strontium ferrite mass fraction is 0.4%, both of the piezoelectric strain constant d33 and piezoelectric voltage constant g33 of the composite have the maximum value, and the values are 16.6pC•N-1 and 31.4mV•m•N-1, which are 35% and 19% larger than that of the composite without strontium ferrite doped, respectively. With the strontium ferrite content increase, both of the dielectric constant εr and the dielectric loss tanδ of the composites increase. With the addition of strontium ferrite the acoustic impedance Z increases, but there is no obvious relation between the strontium ferrite content and Z.
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3

Kikuchi, Takeyuki, Tatsuya Nakamura, Masamichi Miki, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, and Yasunori Ikeda. "Synthesis of Hexagonal Ferrites by Citric Complex Method." Advances in Science and Technology 45 (October 2006): 697–700. http://dx.doi.org/10.4028/www.scientific.net/ast.45.697.

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Various hexagonal ferrites, which include hard and soft ferrites, were prepared by citric complex method. High purity reagent of strontium carbonate, iron (III) nitrate ennnahydrate, cobalt (II) nitrate hexahydrate and lanthanum oxide were used as starting materials. Prepared aqueous solution was heated for dehydration and gelling. Thermal pyrolysis was carried out by heating the gel. The obtained precursor powders were ground with an alumina mortar and compacted by uniaxial pressing into disk specimens and then heated at temperature range between 1023K and 1523K in air. Phase identification and determination of lattice parameters were carried out by powder X-ray diffraction. Scanning Electron Microscope was utilized to investigate the microstructure of the polycrystalline ferrites. Magnetic properties were discussed by magnetization measurements by using a vibration sample magnetometer. Magnetization and coercive force were measured. In the case of M-type ferrite, M-type barium and strontium ferrites were formed at vary low temperature relative to by conventional synthesis. The lanthanum and cobalt substituted M-type strontium ferrite ultra fine powders prepared by citric complex method showed extremely large coercive force.
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4

Aurélio Araujo Costa, Marcos, Edgar Roosevelt Braga-Filho, and Antônio Marcus Nogueira Lima. "Characterization And Control Of A Strontium Ferrite Motor." Eletrônica de Potência 20, no. 1 (February 1, 2015): 104–15. http://dx.doi.org/10.18618/rep.2015.1.104115.

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5

Chen, Nan Chun, Han Mei Ao, and Zhi Liang Zhan. "The Controlling Factors in the Content of Cr6+ in Green Strontium Ferrite." Materials Science Forum 610-613 (January 2009): 28–31. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.28.

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In order to reach the standard of the RoHS that the content of Cr6+ lower than 200ppm in ferrite, this reserch focused on the factors that influence on the content of Cr6+ during the preparation of Strontium Ferrite. The results show that the content of Cr6+ in Strontium Ferrit can be controlled among 91~117 ppm, and the optimum condition is as follows: the quality ratio of raw materials/graphite=10:1.25, the rate of the N2 flow 0.1~0.15 L/min, sintered temperature 950~1020°C, residence time 25~35min at the corresponding temperature point, granularity of the mixed system lower than 0.1~0.3mm.
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6

Liu, Chenglun, Longjun Xu, Xueyan Yang, Tiefeng Peng, and Jianjun Ren. "Preparation of strontium ferrite from strontium residue." Chinese Journal of Geochemistry 31, no. 1 (January 5, 2012): 74–77. http://dx.doi.org/10.1007/s11631-012-0551-9.

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7

Lu, Yi, Xin Chun Yang, Jin Lian Zhu, Fu Zhan Song, and Xiang Qian Shen. "Morphological and Magnetic Characteristics of Strontium Ferrite Micro- and Nanofibers." Advanced Materials Research 399-401 (November 2011): 736–40. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.736.

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Strontium ferrite micro- and nanofibers have been prepared by the sol-gel process and the electrospinning with diameters about 1 μm and 100 nm, respectively. Single phase strontium ferrite fibers are formed after calcined at 750 °C for 2 hours for both the sol-gel and electrospinning processes. These strontium ferrite fibers are fabricated of nanosized particles with a hexagonal plate-like morphology, which grow with the calcination temperature. The microfiber cross-section contains multi-nanoparticles whilst the nanofiber with a necklace-like morphology is linked by nanoparticles at the calcination temperature range from 850 to 1050 °C. The magnetic properties of strontium ferrite fibers are mainly influenced by the grain size and fiber diameter. Both the strontium ferrite micro- and nanofibers calcined at 900°C for 2 hours are fabricated from single-domain grains around 56 nm and exhibit the specific saturation magnetization of 60.8 A•m2•kg-1 (microfibers) and 59.9 A•m2•kg-1 (nanofibers) and coercivity of 361.9 kA•m-1 (micronfibers) and 523.6 kA•m-1 (nanofibers). The coercivity difference between the micro- and nanofibers can be attributed to the different shape anisotropy energies arising from various magnetization reversal behaviors for the micro- and nanofibers.
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8

Teh, Geok Bee, Yat Choy Wong, James Wang, Seng Gee Tan, and Balakrishnan Samini. "Effect of Sol-Gel Synthesis on the Structural and Photoluminescence Properties of Magnetoplumbite-Type Strontium Ferrite." Materials Science Forum 654-656 (June 2010): 1134–37. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.1134.

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Magnetoplumbite-type (M-type) strontium ferrite particles with two stoichiometric ratios (SrFexO19; x = 9.2 and 11.6) have been synthesized via the sol-gel technique employing ethylene glycol as the gel precursor. The prepared samples were characterized using x-ray diffractometry (XRD), thermogravimetric analysis (TGA), photoluminescence (PL) spectrophotometry, field emission scanning electron microscopy (FESEM), energy dispersive x-ray spectrometry (EDS) and superconductivity quantum interference device magnetometry (SQUID). X-ray powder diffraction patterns showed that the samples were single-phase with the space group of P63/mmc and cell parameter values of a = 5.88 Ǻ and c = 23.03 – 23.04 Ǻ. EDS results confirmed the composition being mainly of M-type SrFe12O19. The photoluminescence property of strontium ferrite was examined at excitation wavelength of 260 - 290 nm and significant PL emission peaks centered at 334 nm were detected. Both as-prepared strontium ferrites exhibited significant oxygen vacancies which were detectable via TGA where the sample with the Sr/Fe ratio of 1:11.6 exhibited the highest oxygen vacancies in its structure.
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9

Berthet, P., J. Berthon, G. Heger, and A. Revcolevschi. "Structure of metastable strontium ferrite." Materials Research Bulletin 27, no. 8 (August 1992): 919–24. http://dx.doi.org/10.1016/0025-5408(92)90190-b.

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10

Ahmad, Abid, Bhagyashree Mishra, Andrew Foley, Leslie Wood, and Maggie Yihong Chen. "High Permeability Photosintered Strontium Ferrite Flexible Thin Films." Micromachines 12, no. 1 (January 1, 2021): 42. http://dx.doi.org/10.3390/mi12010042.

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The paper is focused on the development and optimization of strontium ferrite nanomaterial and photosintered flexible thin films. These magnetic thin films are characterized with direct current (DC) and high frequency measurements. For photosintered strontium ferrite samples, we achieved relative complex permeability of about 29.5-j1.8 and relative complex permittivity of about 12.9-j0.3 at a frequency of 5.9 GHz.
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11

Kruželák, Ján, Andrea Kvasničáková, Rastislav Dosoudil, and Ivan Hudec. "Magnetic composites based on NR and strontium ferrite." Acta Chimica Slovaca 12, no. 1 (April 1, 2019): 63–69. http://dx.doi.org/10.2478/acs-2019-0010.

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Abstract Two types of composites based on natural rubber (NR) and strontium ferrite were tested in this study. Composites of the first type were prepared by incorporation of strontium ferrite in the concentration range ranging from 0 to 100 phr (parts per hundred rubber) into pure NR based rubber matrix, while with those of the second type, strontium ferrite was dosed in the same concentration level into NR based rubber batch with constant amount of carbon black — 25 phr. For rubber matrices cross-linking, a standard sulfur based curing system was used. This work is focused on the effect of magnetic filler content on physico-mechanical, magnetic and thermo-physical properties of composite materials. Subsequently, the cross-link density and the structure of the formed sulfidic cross-links were examined. The results showed that the cross-link density of both types of composites increased with the increasing content of magnetic filler, while the structure of the sulfidic cross-links was almost not influenced by the amount of strontium ferrite. Tensile strength of rubber composites with pure rubber matrix was slightly improved by the incorporation of ferrite, while in case of composites based on a carbon black batch, the incorporation of magnetic filler resulted in the decrease of this characteristic. The presence of magnetic filler in both types of composites leads to a significant increase of the remanent magnetic induction.
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12

Kikuchi, Takeyuki, Shinji Yoshida, Tatsuya Nakamura, Tohru Yamasaki, Makoto Nakanishi, Tatsuo Fujii, Jun Takada, and Yasunori Ikeda. "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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13

Chaya, Pannipa, Tula Jutarosaga, and Wandee Onreabroy. "Structure and Magnetic Properties of Co-Substituted Strontium Hexaferrite." Advanced Materials Research 979 (June 2014): 200–203. http://dx.doi.org/10.4028/www.scientific.net/amr.979.200.

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The strontium hexaferrite (SrFe12O19) and Co-substituted strontium hexaferrite (SrCoFe11O19) were prepared by ceramic method. The milled mixture of Fe2O3, SrCO3 and CoO powders were calcined at 1100°C and pellets sintered at 1300°C in air. The crystal structure, morphology and magnetic properties of samples have been investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and vibrating sample magnetometer (VSM), respectively. The crystal structure of SrFe12O19 was hexaferrite with the crystallite size and the lattice constants a and c of 59.6 nm, 5.8 Å, and 23.0 Å, respectively. Also, the crystal structure of SrCoFe11O19 was hexaferrite with the crystallite size and the lattice constants a and c of 63.7 nm, 5.9 Å and 23.0 Å, respectively. The morphology of obtained samples changed from hexagonal rods to discs shape and grain sizes increased with the increase of doped Co in SrFe12O19. SrFe12O19 with the coercive force (Hc) of 2,133 Oe was classified as hard ferrite magnetic. While, Co-substituted strontium hexaferrite (SrCoFe11O19) was soft ferrite magnetic with coercive force of 64 Oe. Results indicated that magnetic properties of samples such as hard ferrite magnetic and soft ferrite magnetic showed great dependence on the cobalt additive in strontium.
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14

Kruželák, Ján, Martina Matvejová, Rastislav Dosoudil, and Ivan Hudec. "Barium and strontium ferrite-filled composites based on NBR and SBR." Journal of Elastomers & Plastics 51, no. 5 (August 9, 2018): 421–39. http://dx.doi.org/10.1177/0095244318792036.

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In the first part of the research, rubber magnetic composites were prepared by incorporation of strontium and barium ferrite in concentration scale ranging from 0 to 200 phr into rubber matrices based on acrylonitrile–butadiene rubber and styrene–butadiene rubber. The main objective was to investigate the influence of the type and content of magnetic filler on the cross-link density, physical–mechanical and magnetic characteristics of the prepared composites. In the second part of the study, the content of magnetic fillers was kept on constant level—200 phr and the main aim was to investigate the change in mutual combination of both fillers on the cross-linking and properties of the rubber magnets. The results revealed that both fillers show reinforcement effect in the rubber matrices. The higher tensile strength of composites was achieved by application of barium ferrite. Magnetic properties of composite materials were significantly influenced by magnetic characteristics of magnetic fillers. Higher remanent magnetic induction of barium ferrite was reflected in higher remanent magnetization of the equivalent composites. On the other hand, higher coercivity of strontium ferrite resulted in higher coercivity of strontium ferrite-filled composites.
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15

Bilovol, V., and R. Martínez-García. "Phase transformation of strontium hexagonal ferrite." Journal of Physics and Chemistry of Solids 86 (November 2015): 131–37. http://dx.doi.org/10.1016/j.jpcs.2015.07.006.

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16

Schmidt, M., M. Hofmann, and S. J. Campbell. "Magnetic structure of strontium ferrite Sr4Fe4O11." Journal of Physics: Condensed Matter 15, no. 50 (December 3, 2003): 8691–701. http://dx.doi.org/10.1088/0953-8984/15/50/003.

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17

Li, Yu Qing, Ying Huang, Shu Hua Qi, Lei Niu, Fang Fang Niu, Yin Ling Zhang, and Yan Fei Wu. "Preparation and Magnetic Properties of Ce-Doped Strontium Ferrite Films." Advanced Materials Research 239-242 (May 2011): 481–85. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.481.

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We have found that La substitutions can improve the magnetic properties of the strontium ferrite films without reducing the saturation magnetization. In this work, SrCexFe12-xO19nanocrystalline films (x=0, 0.2…0.8) with high coercivity were synthesized and deposited on SiO2substrate by sol-gel method and sintering at 900 OC for 2h. The films were characterized by various experimental techniques including X-ray diffraction analysis (XRD), Field Emission Scanning Electron Microscope (FESEM), Vibrating Sample Magnetometry (VSM) and vector network analyzer. The results show that with the increasing content of cerium the coercivity of the films improves greatly and reach the maximum 6678.78 Oe at x=0.2, which is larger than La-doped strontium ferrite films, however the saturation magnetization decreases a lot. In the frequency range of 11.5-12 GHz the electromagnetic properties of the Ce-doped strontium ferrite films are better than La-doped at x=0.2.
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18

Li, Mi Mi, Mei Juan Zhou, Shi Hui Xie, Min Sun, and Shi Feng Huang. "Effects of Polarization on the Strontium Ferrite Modified 0-3 Cement-Based Piezoelectric Composite." Advanced Materials Research 487 (March 2012): 553–57. http://dx.doi.org/10.4028/www.scientific.net/amr.487.553.

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Strontium ferrite modified 0-3 cement-based piezoelectric composites were produced with piezoelectric ceramic [0.08Pb(Li1/4Nb3/4)O•0.47PbTiO3•0.45PbZrO3], sulphoaluminate cement and strontium ferrite by compressing technique, and the effects of poling conditions on the piezoelectric and dielectric properties were investigated. In order to contrast, a unmodified 0-3 cement-based piezoelectric composite was fabricated. The results show that the higher the poling electric field, the longer the poling time and the higher the poling temperature, the composites have the higher piezoelectric strain factor d33, piezoelectric voltage factor g33, dielectric constant εr and dielectric loss tanδ， and the strontium ferrite modified composites are polarized more easily, and have better properties than the unmodified composites. In the meantime, the optimum poling conditions were obtained, and the optimum poling field E, poling time t and poling temperature T were 5 kV/mm, 20 min and 80 °C.
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19

Liu, Xuan Wen, Xiao Chen, Wang De He, and Xi Wei Qi. "Effect of La-Zn Doping on Magnetic Properties of SrFe12O19." Applied Mechanics and Materials 680 (October 2014): 66–69. http://dx.doi.org/10.4028/www.scientific.net/amm.680.66.

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La-Zn doped strontium ferrite, Sr1-xZnxFe12(1-x) La12xO19, was prepared by chemical co-precipitation method. The samples were characterized by XRD, SEM and VSM and the results reveal that La-Zn ions are dispersed completely into the strontium ferrite lattice at 900°C. The VSM analysis shows that Hcj increases to 240.1 KA/m, almost double the value of the original sample. And the specific saturation magnetization increases from 48.78 A • m2/Kg to 63.11A• m2/Kg.
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20

Kruželák, Ján, Richard Sýkora, Rastislav Dosoudil, and Ivan Hudec. "Rubber Composites Based on Polar Elastomers with Incorporated Modified and Unmodified Magnetic Filler." Advances in Materials Science and Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/7242891.

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Rubber magnetic composites were prepared by incorporation of unmodified and surface modified strontium ferrite into rubber matrices based on NBR and NBR/PVC. Strontium ferrite was dosed to the rubber matrices in concentration scale ranging from 0 to 100 phr. The main goal was to investigate the influence of the type of ferrite on the curing process, physical-mechanical and magnetic properties of composites. The mutual interactions between the filler and rubber matrices were investigated by determination of cross-link density and SEM analysis. The incorporation of magnetic fillers leads to the increase of cross-link density and remanent magnetic induction of composites. Moreover, the improvement of physical-mechanical properties was achieved in dependence on the content of magnetic fillers. Surface modification of ferrite contributed to the enhancement of adhesion on the interphase filler-rubber. It can be stated that ferrite exhibits reinforcing effect in the composite materials and this reinforcing behavior was emphasized with the increase in polarity of the rubber matrix.
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21

Huang, Ching-Chien, Chin-Chieh Mo, Guan-Ming Chen, Hsiao-Hsuan Hsu, and Guo-Jiun Shu. "Investigation on the La Replacement and Little Additive Modification of High-Performance Permanent Magnetic Strontium-Ferrite." Processes 9, no. 6 (June 12, 2021): 1034. http://dx.doi.org/10.3390/pr9061034.

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In this work, an experiment was carried out to investigate the preparation condition of anisotropic, Fe-deficient, M-type Sr ferrite with optimum magnetic and physical properties by changing experimental parameters, such as the La substitution amount and little additive modification during fine milling process. The compositions of the calcined ferrites were chosen according to the stoichiometry LaxSr1-xFe12-2xO19, where M-type single-phase calcined powder was synthesized with a composition of x = 0.30. The effect of CaCO3, SiO2, and Co3O4 inter-additives on the Sr ferrite was also discussed in order to obtain low-temperature sintered magnets. The magnetic properties of Br = 4608 Gauss, bHc = 3650 Oe, iHc = 3765 Oe, and (BH)max = 5.23 MGOe were obtained for Sr ferrite hard magnets with low cobalt content at 1.7 wt%, which will eventually be used as high-end permanent magnets for the high-efficiency motor application in automobiles with Br > 4600 ± 50 G and iHc > 3600 ± 50 Oe.
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22

Zhang, Chao, Shan-Shan Wang, Rui-Song Guo, Guang-Lan Cai, Wei-Na Guo, and Chen Wu. "Magnetic and dielectric properties of 3Y-TZP/strontium doped barium ferrite composite." Functional Materials Letters 08, no. 04 (August 2015): 1550040. http://dx.doi.org/10.1142/s179360471550040x.

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Magnetic and dielectric properties of 3Y-TZP/20 wt.% Ba 1-x Sr x Fe 12 O 19 (x = 0, 0.25, 0.5, 0.75) composites prepared by solid state reaction method are investigated. The magnetic properties are improved in the composites with the strontium doped barium ferrite. When x = 0.25, the saturation magnetization of the ferrite reaches the maximum. This is due to the migration of Fe 3+ induced by the Sr 2+ doping. The dielectric properties are also improved in the composite with the strontium doped barium ferrite. When x = 0.5, the dielectric constant and dielectric loss possess the maximum. This is caused by the lattice distortion resulting from the Sr 2+ doping. The dielectric properties are analyzed by the universal relaxation law.
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23

Bindra Narang, Sukhleen, Pawandeep Kaur, and Shalini Bahel. "Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite." Materials Science-Poland 34, no. 1 (March 1, 2016): 19–24. http://dx.doi.org/10.1515/msp-2016-0008.

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AbstractM-type strontium ferrite with compositions SrFe(12-2x)CoxTixO19 (x = 0.0, 0.3, 0.5, 0.7, 1.0), were prepared by two route ceramic method. The effects of Co–Ti substitution on their microstructure, electromagnetic properties, and microwave absorptive behavior were analyzed. The complex permittivity (∊′-j∊″) and complex permeability (μ′-jμ″) have been measured from 8.2 to 12.4 GHz using a network analyzer. Scanning electron microscope was used to analyze the grain size distribution and porosity of the ferrite. X-ray diffraction confirmed the M-type structure of the doped strontium ferrite. Vibrating sample magnetometer was used to study hysteresis loop of the ferrite. This study suggests that the control of grain size, decrease in coercivity and enhanced values of dielectric constant and loss are effective means to improve microwave absorption. The dielectric constant and loss were enhanced in comparison to the permeability constant and loss over the entire frequency range.
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24

Miyajima, Naoki, Kazuyuki Akasaka, Takeshi Waki, Yoshikazu Tabata, Yoshinori Kobayashi, and Hiroyuki Nakamura. "Mössbauer effect of Ni-doped strontium ferrite." Hyperfine Interactions 206, no. 1-3 (December 20, 2011): 115–18. http://dx.doi.org/10.1007/s10751-011-0521-3.

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25

Kirrane, Barbara M., Lewis S. Nelson, and Robert S. Hoffman. "Massive Strontium Ferrite Ingestion without Acute Toxicity." Basic Clinical Pharmacology Toxicology 99, no. 5 (November 2006): 358–59. http://dx.doi.org/10.1111/j.1742-7843.2006.pto_566.x.

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26

Fan, Xi-Jing, and Egon Matijevic. "Preparation of Uniform Colloidal Strontium Ferrite Particles." Journal of the American Ceramic Society 71, no. 1 (January 1988): C—60—C—62. http://dx.doi.org/10.1111/j.1151-2916.1988.tb05785.x.

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27

Nishio, H., H. Taguchi, F. Hirata, and T. Takeishi. "Magnetic viscosity in strontium ferrite fine particles." IEEE Transactions on Magnetics 29, no. 6 (November 1993): 2637–39. http://dx.doi.org/10.1109/20.280841.

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28

Bogdanovich, M. P. "Glass-added strontium ferrite of high coercivity." Glass and Ceramics 52, no. 7 (July 1995): 194–96. http://dx.doi.org/10.1007/bf00681060.

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29

Yakout, Sobhy M., Mohamed R. Hassan, and Mohamed I. Aly. "Synthesis of magnetic alginate beads based on magnesium ferrite (MgFe2O4) nanoparticles for removal of Sr (II) from aqueous solution: kinetic, equilibrium and thermodynamic studies." Water Science and Technology 77, no. 11 (May 17, 2018): 2714–22. http://dx.doi.org/10.2166/wst.2018.228.

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Abstract Novel magnetic alginate beads (MagAlgbeads) have been developed by incorporation of magnesium ferrite (MgFe2O4) in alginate beads with the aim of using them in the removal of strontium from aqueous solution. MagAlgbeads were characterized by transmission electron microscopy, scanning electron microscopy, X-ray fluorescence and Fourier transform infrared spectroscopy. The adsorption of strontium onto MagAlgbeads were found to depend on pH and strontium removal increases with increasing pH until pH is 6. Strontium adsorption kinetics run through pseudo-second-order model. Thermodynamically, strontium adsorption was endothermic and spontaneous. Langmuir isotherm gave good fitting for strontium removal with adsorption capacity of 505.5 mg/g. These results proved that the prepared MagAlgbeads are very efficient material for strontium adsorption.
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30

Makovec, D., G. Dražić, S. Gyergyek, and D. Lisjak. "A new polymorph of strontium hexaferrite stabilized at the nanoscale." CrystEngComm 22, no. 42 (2020): 7113–22. http://dx.doi.org/10.1039/d0ce01111h.

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31

Egorov, I. N., S. I. Egorova, and G. F. Lemeshko. "Diagnostic of Structural Changes in Ferromagnetic Powders during Milling in Beater Mill." Solid State Phenomena 316 (April 2021): 187–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.187.

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Problem of obtaining fine powders of strontium hexa-ferrite is actual because of its wide applications. The paper provides the results of studies of particle size distribution and structural characteristic changes of strontium hexa-ferrite powder (SrFe12O19) during milling in impact mill and after its consequent annealing. Mechanical processing of coarse particulate system was carried out in the mill for 120 minutes without electromagnetic effect and with creation of magneto fluidized bed, formed by perpendicular constant and alternating magnetic field with induction gradient of 210 mT/m, providing reciprocating motion of particles and aggregates with sizes of 3 – 4 mm. It was shown that milling of coarse strontium hexa-ferrite with average particle size 1558.5 μm and the most possible size 1500 μm in magneto fluidized bed allowed to intensify milling process and to provide a significant increase of powder particle sizes uniformity. It was found out, that milling in magneto fluidized bed leads to a great decrease of coherent scattering regions sizes and an increase of lattice micro-deformations and relative dislocation density. Consequent annealing of the powder for 2 hours at 850°C refined structural characteristics significantly. The carried out research allows to choose the optimal milling duration for solution of practical problems of powder metallurgy.
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32

Das, Tridip, Jason D. Nicholas, and Yue Qi. "Long-range charge transfer and oxygen vacancy interactions in strontium ferrite." Journal of Materials Chemistry A 5, no. 9 (2017): 4493–506. http://dx.doi.org/10.1039/c6ta10357j.

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33

Kharton, V. "Oxygen ionic conductivity of Ti-containing strontium ferrite." Solid State Ionics 133, no. 1-2 (August 1, 2000): 57–65. http://dx.doi.org/10.1016/s0167-2738(00)00738-4.

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34

Schmidt, M. "Mechanical and thermal carbonation of strontium ferrite SrFeOx." Materials Research Bulletin 37, no. 13 (October 2002): 2093–105. http://dx.doi.org/10.1016/s0025-5408(02)00898-x.

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35

Choi, Dong Hyeok, Sang Won Lee, In-Bo Shim, and Chul Sung Kim. "Mössbauer studies for La–Co substituted strontium ferrite." Journal of Magnetism and Magnetic Materials 304, no. 1 (September 2006): e243-e245. http://dx.doi.org/10.1016/j.jmmm.2006.01.151.

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36

Canale, L., C. Girault, A. Bessaudou, A. Celerier, F. Cosset, J. L. Decossas, and J. C. Vareille. "Pulsed laser deposition of strontium ferrite thin films." Applied Surface Science 154-155 (February 2000): 444–48. http://dx.doi.org/10.1016/s0169-4332(99)00375-x.

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37

Lim, Jung Tae, In-Bo Shim, Chul Sung Kim, and Sung Baek Kim. "Mössbauer Studies of Z-Type Sr3Co2Fe24O41 Strontium Ferrite." Journal of the Korean Physical Society 73, no. 1 (July 2018): 86–89. http://dx.doi.org/10.3938/jkps.73.86.

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38

YU, H., Z. LIU, and D. ZENG. "TEM observation of sintered permanent magnetic strontium ferrite." Rare Metals 25, no. 6 (October 2006): 578–83. http://dx.doi.org/10.1016/s1001-0521(07)60149-1.

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39

Visnovský, S., M. Nývlt, R. Krishnan, B. Ramamurthy Acharya, S. Prasad, and N. Venkatramani. "Magnetooptical Kerr Spectra in Sputtered Strontium Ferrite Films." Le Journal de Physique IV 07, no. C1 (March 1997): C1–721—C1–722. http://dx.doi.org/10.1051/jp4:19971294.

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40

Garcı́a, T., E. de Posada, L. Ponce, J. L. Sánchez, S. Dı́az, E. Pedrero, F. Fernández, et al. "Textured strontium ferrite thin films grown by PLD." Materials Letters 49, no. 5 (July 2001): 294–98. http://dx.doi.org/10.1016/s0167-577x(00)00387-6.

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41

Shaula, A. L., O. V. Karavai, Yu A. Ivanova, S. M. Mikhalev, and L. A. C. Tarelho. "Strontium ferrite as a three-way catalyst component." Materials Letters 216 (April 2018): 273–76. http://dx.doi.org/10.1016/j.matlet.2018.01.125.

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42

Luo, Ju Hua. "Preparation of Strontium Ferrite Powders by Mechanochemical Process." Applied Mechanics and Materials 110-116 (October 2011): 1736–40. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.1736.

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Sr-ferrite powders were preparated by mechanochemical treatments using SrCO3 and Fe2O3 as raw materials. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM) were employed to evaluated the morphologies, structures and magnetic properties of samples. The results indicated that the starting mixture became amorphous stage after ball-milled for 30h, and single phase SrFe12O19 could be obtained after annealed at 900°C for 2h. And the saturation magnetization was 58.2Am2/kg, and coercivity was 281.2 kA/m at room temperature. In comparison with the traditional firing method , the mechanochemical method benefited achieving the higher coercivity, which indicated that the samples had a better magnetic properties.
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43

Senzaki, Yoshihide, James Caruso, Mark J. Hampden-Smith, Toivo T. Kodas, and Lu-Min Wang. "Preparation of Strontium Ferrite Particles by Spray Pyrolysis." Journal of the American Ceramic Society 78, no. 11 (November 1995): 2973–76. http://dx.doi.org/10.1111/j.1151-2916.1995.tb09072.x.

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44

Coffey, Gregory W., John S. Hardy, Larry R. Pederson, Peter C. Rieke, and Edwin C. Thomsen. "Oxygen Reduction Activity of Lanthanum Strontium Nickel Ferrite." Electrochemical and Solid-State Letters 6, no. 6 (2003): A121. http://dx.doi.org/10.1149/1.1568174.

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45

Zainullina, V. M., M. A. Korotin, and V. L. Kozhevnikov. "Electronic structure and properties of strontium ferrite Sr3Fe2O6." European Physical Journal B 49, no. 4 (February 2006): 425–31. http://dx.doi.org/10.1140/epjb/e2006-00081-5.

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46

Ramamurthy Acharya, B., S. N. Piramanayagam, Antony Ajan, S. N. Shringi, Shiva Prasad, N. Venkataramani, R. Krishnan, S. D. Kulkarni, and S. K. Date. "Oriented strontium ferrite films sputtered onto Si(111)." Journal of Magnetism and Magnetic Materials 140-144 (February 1995): 723–24. http://dx.doi.org/10.1016/0304-8853(94)00967-8.

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47

Verma, Amitabh, O. P. Pandey, and Puneet Sharma. "ChemInform Abstract: Strontium Ferrite Permanent Magnet-An Overview." ChemInform 32, no. 38 (May 24, 2010): no. http://dx.doi.org/10.1002/chin.200138258.

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48

Qin, Yan, Yang Li, Kun Yang, Zhi Xiong Huang, and Jia Chen. "Study on Damping Properties of Fe12O19Sr/NBR Composite." Advanced Materials Research 1046 (October 2014): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amr.1046.3.

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Magnetic damping composite was prepared by mechanical blending method. As acrylonitrile butadiene rubber was matrix, strontium ferrite magnetic powder was function phase. The vibrating sample magnetometer (VSM) test shows that the magnetic properties of the magnetic rubber composite are related with the content of the magnetic powder and unrelated with rubber matrix. The dynamic mechanical analysis (DMA) and TA method compare show that the damping properties of the composite are improved with adding the strontium ferrite magnetic particle, but the damping properties of composite are best after magnetizing the sample, but the damping properties of the composites decreased with increasing the content of the magnetic powder. The damping properties of the composites at the test frequency 30HZ and 50HZ are higher than 1HZ.
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49

de Campos, Marcos Flavio, Daniel Rodrigues, Mara Carolina do Carmo Paresque, and Jose Adilson de Castro. "Hysteresis Modeling of Bonded Anisotropic Ferrite Magnets." Materials Science Forum 912 (January 2018): 102–5. http://dx.doi.org/10.4028/www.scientific.net/msf.912.102.

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The modeling of hysteresis curves of bonded ferrite magnets is discussed. Hysteresis of anisotropic magnets were calculated according to the Stoner-Wohlfarth Model, for the cosn (theta) distribution. The crystallographic texture has significant effect on the hysteresis curve. Two different samples were examined, one isotropic and another anisotropic. The anisotropy field of strontium ferrite magnets was determined to be 19.5 kOe. The Mr/Ms ratio of the anisotropic bonded magnet was estimated as 0.8.
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50

Budiman, Arif, Dwi Puryanti, Sri Mulyadi Dt Basa, Muhammad Rizki, and Helfi Syukriani. "Karakterisasi Struktur Kristal dan Sifat Magnetik Magnet Stronsium Ferit Pasir Besi Batang Sukam Kabupaten Sijunjung Sumatera Barat." Prosiding SNFA (Seminar Nasional Fisika dan Aplikasinya) 1 (January 30, 2017): 38. http://dx.doi.org/10.20961/prosidingsnfa.v1i0.4500.

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<p><strong>Abstract:</strong> The synthesis and characterization of the crystal structure and magnetic properties of strontium ferrite magnets (SrO.6Fe<sub>2</sub>O<sub>3</sub>) has been done. Hematite (Fe<sub>2</sub>O<sub>3</sub>) is synthesized from iron sand of Batang Sukam Sijunjung Sumatera Barat through the oxidation process by temperature 700ºC for 3.0 hours. Strontium carbonate (SrCO<sub>3</sub>) was obtained from Merck product with a purity of more than 99%. Synthesis of strontium ferrite magnets are made through a process of solid-solid mixing and sintering at a temperature of 1000ºC for 3.0 hours. The results of characterization of X-ray diffraction indicates that it has formed a single phase strontium ferrite magnets with a hexagonal crystal structure. The result of measurement of the magnetic properties shows that an average magnetic susceptibility of strontium ferrite magnet is 266.7 × 10<sup>-8 </sup>m<sup>3</sup> /kg.</p><p> </p><p><strong>Keywords</strong>: strontium ferrite magnet, iron sand, crystal structure and magnetic susceptibility.</p><p><strong> </strong></p><p><strong>Abstrak:</strong> Telah dilakukan sintesis dan karakterisasi struktur kristal dan sifat magnetik magnet stronsium ferit (SrO.6Fe<sub>2</sub>O<sub>3</sub>). Hematit (Fe<sub>2</sub>O<sub>3</sub>) disintesis daripasir besi Batang Sukam Kabupaten Sijunjung Sumatera Barat melalui proses oksidasi dengan temperatur 700ºC selama 3,0 jam. Stronsium karbonat (SrCO<sub>3</sub>) diperoleh dari produk Merck dengan kemurnian lebih dari 99 %. Sintesis magnet stronsium ferit dibuat melalui proses <em>solid-solid mixing</em> dan disintering pada suhu 1000ºC selama 3,0 jam. Hasil karakterisasi difraksi sinar-X menunjukkan bahwa telah terbentuk <em>single phase</em> magnet stronsium ferit dengan struktur kristal heksagonal. Hasil pengukuran sifat magnet menunjukkan bahwa magnet stronsium ferit memiliki suseptibilitas magnetik rata-rata 266,7 × 10<sup>-8</sup> m<sup>3</sup>/kg.</p><p> </p><p><strong>Kata Kunci:</strong> magnet stronsium ferit, pasir besi, struktur kristal dan suseptibilitas magnetik.</p>
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