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Journal articles on the topic 'Zinc ferrites'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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1

Al-Rubaiey, Najem A., Mohammed G. Albrazanjy, Wafaa A. Kadhim, Hassan D. Mohammed, and Mohd Hasbi Ab Rahim. "The Potential of Using Zn0.6Ni0.4Fe2O4 Nanoparticles as Corrosion Inhibitor for Carbon Steel in Oil Environment." Materials Science Forum 1021 (February 2021): 335–43. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.335.

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Corrosion is one of the serious problems in oil and gas industry. So far, many inhibitors have been used to control or reduce corrosion. Nowadays, nano-materials have been employed as inhibitors as well due to their excellent properties such as high surface area, excellent inhibition efficiency, low cost, and minimum toxicity. In the current work, nano-ferrite materials have been used as inhibitors to reduce the corrosion of carbon steel in oil environment (crude oil obtained from Iraqi Majnoon oil field). The anti-corrosion properties of the nickel and zinc ferrite on carbon steel in Iraqi oil media have been evaluated. The nano materials of nickel Ferrities (NiFe2O4) zinc Ferrities (ZnFe2O4) and Zn-Ni doped Ferities (Zn0.6. Ni0.4Fe2O4) were selected as additive ferrites. It has been found that nano-nickel and zinc ferrites could act as an effective corrosion inhibitor for the metal carbon steel. An average reduction of about 38% in the corrosion rate has been achieved when using Zn-Ni doped Ferities (Zn0.6. Ni0.4Fe2O4) with the crude oil as a corrosive environment.
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2

Peelamedu, Ramesh, Craig Grimes, Dinesh Agrawal, Rustum Roy, and Purushotham Yadoji. "Ultralow dielectric constant nickel–zinc ferrites using microwave sintering." Journal of Materials Research 18, no. 10 (October 2003): 2292–95. http://dx.doi.org/10.1557/jmr.2003.0320.

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Ultralow dielectric constant values were measured on Ni–Zn ferrites prepared using Fe2O3 as a starting material and sintered in a microwave field. Significant differences in microstructure, magnetic, and dielectric properties were observed between microwave-sintered Ni–Zn ferrites prepared using Fe3O4 (T34) and those starting with Fe2O3 (T23) ingredients. Higher magnetization values observed in T23 ferrite are attributed to large grain size, possibly containing abundant domain walls and the presence of fewer Fe2+ ions. The ultralow dielectric constant values observed on T23 ferrites show that this procedure is highly suitable to prepare Ni–Zn ferrites for high-frequency switching applications.
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3

Tangcharoen, Thanit, Anucha Ruangphanit, Wantana Klysubun, and Wisanu Pecharapa. "Sol-gel Combustion Synthesis and Characterizations of Nanocrystalline Zinc, Nickel and Nickel-Zinc Ferrites." Advanced Materials Research 802 (September 2013): 64–68. http://dx.doi.org/10.4028/www.scientific.net/amr.802.64.

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In this work, X-ray diffraction (XRD), Raman spectroscopy (RAMAN) and vibrating sample magnetometer (VSM) measurements were employed to investigate the crystal structure, chemical bonding and magnetic properties of the nanocrystalline Zinc, Nickel and Nickel-Zinc ferrites (ZnFe2O4, NiFe2O4 and Ni0.5Zn0.5Fe2O4) which were synthesized by sol-gel combustion method. Moreover, the composition of elements and the electronic structure including the cation distribution for all ferrite samples were examined through synchrotron X-ray fluorescence (XRF) and X-ray absorption near-edge structure (XANES) spectra. The overall characterization results indicate that the different amount of zinc and nickel ions in ferrites has crucial effect on their physical, magnetism and the site occupancy distribution of Fe3+ ions.
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4

Vasambekar, Pramod N., Tukaram J. Shinde, and Ashok B. Gadkari. "Nd 3+ Substituted Nanocrystalline Zinc Ferrite Sensors for Ethanol, LPG and Chlorine." Applied Mechanics and Materials 310 (February 2013): 150–53. http://dx.doi.org/10.4028/www.scientific.net/amm.310.150.

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Nd 3+ substituted zinc ferrites with chemical formula ZnNdxFe 2-x O4 (x = 0, 0.01, 0.02, and 0.03) were prepared by oxalate co-precipitation method and characterized by XRD, IR and SEM techniques. The gas sensing properties were studied for ethanol, LPG and chlorine. It was observed that nanocrystalline ZnFe2O4 shows maximum sensitivity to ethanol (~41%) followed by LPG (~22%) and less sensitivity to Cl2 (~10%) at an operating temperature of 327oC. The sensitivity of zinc ferrites increases with increase in Nd 3+ content. Response-recovery times of zinc ferrite decreases with increase in Nd3+ content.
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5

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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6

Jovalekic, Cedomir, Aleksandar Nikolic, Maja Gruden-Pavlovic, and Miodrag Pavlovic. "Mechanochemical synthesis of stoichiometric nickel and nickel-zinc ferrite powders with Nicolson-Ross analysis of absorption coefficients." Journal of the Serbian Chemical Society 77, no. 4 (2012): 497–505. http://dx.doi.org/10.2298/jsc110302186j.

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The interest in finding new methods for preparation of nickel ferrite (NiFe2O4) and nickel-zinc ferrite (NixZn1-xFe2O4) powders has recently increased, due to the fact that physical and chemical properties of these soft magnetic materials depend strongly on the preparation conditions. In this paper, powder samples of ferrites were obtained by: 1) classic sintering procedure (NixZn1-xFe2O4, x = 0.9) and 2) planetary mill synthesis (both NiFe2O4 and NixZn1-xFe2O4). Mechanochemical reaction leading to the formation of NixZn1-xFe2O4 (x = 1 and 0.9) spinel phase was monitored by SEM, TEM, and XRD. Values of the real and imaginary parts of permittivity and permeability were measured for the obtained nickel and nickel-zinc ferrite samples in the 7-12 GHz frequency range. Based on the obtained results, the EMR absorption coefficients were calculated for all three sample types. It has been concluded that the method of preparation and the final particle size influence the EMR absorption coefficient of nickel and nickel-zinc ferrites.
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7

Maklad, M. H., N. M. Shash, and H. K. Abdelsalam. "Synthesis, characterization and magnetic properties of nanocrystalline Ni1-xZnxFe2O4 spinels via coprecipitation precursor." International Journal of Modern Physics B 28, no. 25 (September 9, 2014): 1450165. http://dx.doi.org/10.1142/s0217979214501653.

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Nanocrystalline Ni 1-x Zn x Fe 2 O 4 (0.0 ≤ x ≤ 1.0) spinels are synthesized with a crystallite size range 5–2.2 nm, using different annealing temperatures. The influence of zinc content as well as grain size of ferrite on the ferrite microstructure, therefore on the physical properties of ferrite, are investigated by means of X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), thermal analysis (TG, DTG, DSC) and infrared microscopy (IR). XRD results confirm single phase spinel structure for ferrite with Zn content x = 0.1 whereas second phase appears in higher zinc content ferrites. Thermal analysis shows an endothermic peak at ~ 720°C–750°C reveals the removal of defective surface layer existed on the surface of ferrite grains, which leads to cation redistribution. This is supported by the shift observed in IR bands as a result of the increase in zinc content or calcination temperature. Ferrite with composition Ni 0.7 Zn 0.3 Fe 2 O 4 calcined at 1000°C has the maximum saturation magnetization Ms among various compositions at different calcination temperatures. The Ms and the coercivity Hc of the ferrites nanoparticles are different from their corresponding bulk, which attributes to a defective surface layer, controlling the ultrafine particle behavior.
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8

Leclerc, Nathalie, Eric Meux, and Jean-Marie Lecuire. "Hydrometallurgical extraction of zinc from zinc ferrites." Hydrometallurgy 70, no. 1-3 (July 2003): 175–83. http://dx.doi.org/10.1016/s0304-386x(03)00079-3.

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9

Ravinder, D., T. Seshagiri Rao, and Y. V. Ramana. "Elasticity of zinc and lithium-zinc ferrites." Journal of Materials Science Letters 10, no. 20 (1991): 1220–21. http://dx.doi.org/10.1007/bf00727910.

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10

Gatelyte, Aurelija, Darius Jasaitis, Aldona Beganskiene, and Aivaras Kareiva. "Sol-Gel Derived Ferrites: Synthesis and Characterization." Advanced Materials Research 222 (April 2011): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.222.235.

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In the present work, the sinterability and formation of nanosized yttrium iron garnet (Y3Fe5O12), yttrium perovskite ferrite (YFeO3), cobalt, nickel and zinc iron spinel (CoFe2O4, NiFe2O4 and ZnFe2O4, respectively) powders by an aqueous sol-gel processes are investigated. The phase purity of synthesized nano-compounds was characterized by powder X-ray diffraction analysis (XRD). The microstructural evolution and morphological features of obtained transition metal ferrites were studied by scanning electron microscopy (SEM). The possible application of these nanosized transition metal ferrites as ceramic pigments was demonstrated.
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11

Gómez, Patricia, Daniel Elduque, Carmelo Pina, and Carlos Javierre. "Influence of the Composition on the Environmental Impact of Soft Ferrites." Materials 11, no. 10 (September 20, 2018): 1789. http://dx.doi.org/10.3390/ma11101789.

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The aim of this paper is to analyze the influence of the composition on the environmental impact of the two main types of soft ferrites, allowing scientists and engineers to compare them based not only on cost and properties, but also on an environmental point of view. Iron oxides are the basis of soft ferrites, but these ferrites have a wide range of compositions, using materials such as manganese or nickel, which affect their magnetic properties, but also modify the environmental impact. A Life Cycle Assessment has been carried out for manganese‒zinc (MnZn) and nickel‒zinc (NiZn) soft ferrites, with a Monte Carlo approach to assess multiple compositions. The LCA model was developed with SimaPro 8.4, using the EcoInvent v3.4 life cycle inventory database. Environmental impact values were calculated under the ReCiPe and Carbon Footprint methodologies, obtaining a broad variety of results depending on the composition. The results were also significantly different from the standard EcoInvent ferrite. For the analyzed soft ferrites, the presence of manganese or nickel is a key factor from an environmental perspective, as these materials involve high environmental impacts, and their supply risk has increased during recent years, making them a concern for European manufacturers.
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12

Michalowsky, L., H. Baumgartner, and W. Ernst. "Microstructure of manganese-zinc ferrites." Ceramics International 19, no. 2 (January 1993): 77–85. http://dx.doi.org/10.1016/0272-8842(93)90079-7.

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13

Torres, L., F. Walz, C. de Francisco, and J. Iñiguez. "Magnetic Aftereffects in Zinc Ferrites." physica status solidi (a) 163, no. 1 (September 1997): 221–31. http://dx.doi.org/10.1002/1521-396x(199709)163:1<221::aid-pssa221>3.0.co;2-g.

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14

Walters, I., R. Shende, and J. A. Puszynski. "Hydrogen Production from Thermochemical Water-Splitting Using Ferrites Prepared by Solution Combustion Synthesis." Advances in Science and Technology 91 (October 2014): 32–38. http://dx.doi.org/10.4028/www.scientific.net/ast.91.32.

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Currently, there are several methods to produce spinel ferrite powder material such as sol-gel synthesis, self-propagating high-temperature synthesis (SHS), aerosol spray pyrolysis, and solution combustion synthesis (SCS). These methods have been shown to produce nominally phase pure ferrites for use in hydrogen generation by thermochemical water-splitting. Among these methods, the ferrites derived by SCS have not been fully investigated for hydrogen generation from thermochemical water-splitting. SCS, in general, has several advantages such as it being a simple synthesis that can be done relatively quickly and produces materials with high specific surface area. In this study, nickel, zinc, cobalt, and manganese ferrites were synthesized using SCS and analyzed by XRD, BET, and SEM. Each ferrite material was placed inside an Inconel tubular reactor and five consecutive thermochemical cycles to determine hydrogen production. The regeneration and water-splitting temperatures were performed with water-splitting and regeneration temperatures of 900°C and 1100°C, respectively. Nickel ferrite produced significantly higher average hydrogen volume as compared to the other ferrites over the five thermochemical cycles. However, all four ferrites showed a decrease in hydrogen volume generation with increase in consecutive water-splitting cycle, which could be due to the grain growth as observed by BET and SEM analyses.
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15

Anjaneyulu, T., P. Narayana Murthy, S. M. Rafi, S. Bademiya, and G. Samuel John. "Effect on Magnetic Properties of Zinc Doped Nano Ferrites Synthesized by Precursor or Method." International Letters of Chemistry, Physics and Astronomy 19 (October 2013): 37–43. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.19.37.

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Nanocrystalline Cu-Zn ferrites have been synthesized using precursor method. Cu-Zn ferrites were formed at low temperature without any impurities. The particle sizes were observed to decrease from 60 nm to 50 nm with increasing non-magnetic Zn doping. Cu is used to decrease the sintering temperature. The X-ray diffraction (XRD) and IR analysis of Cu-Zn revealed the formation of Single-Phase Spinel structure at very low annealing temperature. The particle sizes observed from XRD is very well in agreement with SEM analysis. Cu-Zn ferrite nanoparticles were observed to be dependent on the particle size. Saturation (Ms) and Remanence (Mr) magnetization of ferrites increases due to the modifications occurred among the A-B, A-A and B-B interactions of Spinel structure. The Coercive force (Hc) decreases with increase of Zn ions concentration.
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16

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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17

Ušáková, Mariana, Elemír Ušák, Martin Šoka, and Ján Lokaj. "The influence of selected ions on various characteristics of Nickel-Zinc ferrites." Journal of Electrical Engineering 69, no. 6 (December 1, 2018): 449–53. http://dx.doi.org/10.2478/jee-2018-0072.

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Abstract One of acknowledged methods remarkably improving structural, magnetic and electrical properties of spinel ferrite systems is the substitution of iron ions by some trivalent ions. In the family of spinel ferrites, thanks to its high saturation magnetization and electrical resistivity as well as low losses, the nickel-zinc ferrite is a very important magnetic material used in many applications in electrical engineering and electronics. The properties of these materials are in general dependent upon chemical composition, method of preparation, stoichiometry, sintering time, temperature as well as the atmosphere, etc. In this study the influence of appropriately selected ions (M = In3+, Nd3+, Dy3+ and Er3+), partly replacing Fe3+, on the microstructure and magnetic properties of spinel ferrite with the composition Ni0.42Zn0.58M0.02Fe1.98O4 fabricated by means of standard ceramic technology was investigated.
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18

Fernandes, Ricardo J. C., Carlos A. B. Magalhães, Ana Rita O. Rodrigues, Bernardo G. Almeida, Ana Pires, André Miguel Pereira, João Pedro Araujo, Elisabete M. S. Castanheira, and Paulo J. G. Coutinho. "Photodeposition of Silver on Zinc/Calcium Ferrite Nanoparticles: A Contribution to Efficient Effluent Remediation and Catalyst Reutilization." Nanomaterials 11, no. 4 (March 24, 2021): 831. http://dx.doi.org/10.3390/nano11040831.

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The efficient photodegradation of textile dyes is still a challenge, especially considering resistant azo dyes. In this work, zinc/calcium mixed ferrite nanoparticles prepared by the sol–gel method were coupled with silver by a photodeposition method to enhance the photocatalytic potency. The obtained zinc/calcium ferrites are mainly cubic-shaped nanoparticles sized 15 ± 2 nm determined from TEM and XRD and an optical bandgap of 1.6 eV. Magnetic measurements indicate a superparamagnetic behavior with saturation magnetizations of 44.22 emu/g and 27.97 emu/g, respectively, for Zn/Ca ferrite and Zn/Ca ferrite with photodeposited silver. The zinc/calcium ferrite nanoparticles with photodeposited silver showed efficient photodegradation of the textile azo dyes C.I. Reactive Blue 250 and C.I. Reactive Yellow 145. Subsequent cycles of the use of the photocatalyst indicate the possibility of magnetic recovery and reutilization without a significant loss of efficiency.
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19

Suh, Jung Ju, and Young Ho Han. "Quantitative Analysis of Zinc Vaporization from Manganese Zinc Ferrites." Journal of the American Ceramic Society 86, no. 5 (May 2003): 765–68. http://dx.doi.org/10.1111/j.1151-2916.2003.tb03372.x.

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20

Ji, Hai Ning, Zhong Wen Lan, Zhong Yu, L. Z. Li, Z. Y. Xu, and S. J. Wu. "Thermal Stability of CoTi-Substituted Manganese-Zinc Ferrites." Advanced Materials Research 44-46 (June 2008): 71–76. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.71.

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In this paper, several new main compositions are presented with Mn2+ substituted by Ti4+ and Co2+ in Manganese-zinc ferrites in consideration of the strong influence of Ti4+ and Co2+ on thermal stability by different mechanisms. Moreover, the effects of these substitutions on such parameters as permeability, electrical resistivity, density, and power loss are analyzed. The experimental results show that the proper substitution of Ti4+ or Co2+ in manganese-zinc ferrites can increase the thermal stability remarkably. Furthermore, the effects of composition of Ti4+ and Co2+substitutions have interactive process, especially when Manganese-zinc ferrites with high thermal stability in 20°C~140°C are achieved when the substitution of Ti4+ is 0.10mol%and Co2+ is 0.05mol%.
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21

Lucke, R., E. Schlegel, and R. Strienitz. "Hydrothermal Preparation of Manganese Zinc Ferrites." Le Journal de Physique IV 07, no. C1 (March 1997): C1–63—C1–64. http://dx.doi.org/10.1051/jp4:1997112.

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22

Dreikorn, J., R. Dreyer, L. Michalowsky, J. Rossel, and U. Sicker. "Manganese-zinc ferrites with improved properties." Le Journal de Physique IV 08, PR2 (June 1998): Pr2–457—Pr2–460. http://dx.doi.org/10.1051/jp4:19982107.

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23

Murthy, S. R. "ƊE-EFFECT IN NICKEL-ZINC FERRITES." Le Journal de Physique Colloques 49, no. C8 (December 1988): C8–927—C8–928. http://dx.doi.org/10.1051/jphyscol:19888422.

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24

Wang, J., P. F. Chong, S. C. Ng, and L. M. Gan. "Microemulsion processing of manganese zinc ferrites." Materials Letters 30, no. 2-3 (February 1997): 217–21. http://dx.doi.org/10.1016/s0167-577x(96)00200-5.

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25

Burlachenko, O. V., O. I. Pushkarev, and M. N. Kiseleva. "Diamond finishing of manganese–zinc ferrites." Russian Engineering Research 35, no. 10 (October 2015): 798–99. http://dx.doi.org/10.3103/s1068798x1510007x.

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26

De Francisco, C., J. M. Munoz, J. Ayala, and J. I. Iniguez. "Magnetic disaccommodation in ferrous Zinc ferrites." Physica Status Solidi (a) 108, no. 2 (August 16, 1988): 721–31. http://dx.doi.org/10.1002/pssa.2211080229.

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27

Rozman, Marko, and Miha Drofenik. "Hydrothermal Synthesis of Manganese Zinc Ferrites." Journal of the American Ceramic Society 78, no. 9 (September 1995): 2449–55. http://dx.doi.org/10.1111/j.1151-2916.1995.tb08684.x.

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28

Kale, G. M., and T. Asokan. "Electrical properties of cobalt‐zinc ferrites." Applied Physics Letters 62, no. 19 (May 10, 1993): 2324–25. http://dx.doi.org/10.1063/1.109405.

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29

Abd El-Ati, M. I., AzizM Kafafy, and A. Tawfik. "Magnetic Properties of Zinc Doped Ferrites." Acta Physica Polonica A 79, no. 6 (June 1991): 889–94. http://dx.doi.org/10.12693/aphyspola.79.889.

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30

Astafyev, Alexander, Elena Lysenko, Anatoly Surzhikov, Evgeniy Nikolaev, and Vitaly Vlasov. "Thermomagnetometric analysis of nickel–zinc ferrites." Journal of Thermal Analysis and Calorimetry 142, no. 5 (September 15, 2020): 1775–81. http://dx.doi.org/10.1007/s10973-020-10182-3.

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31

Arean, C. Otero, E. Garcia Diaz, J. M. Rubio Gonzalez, and M. A. Villa Garcia. "Crystal chemistry of cadmium-zinc ferrites." Journal of Solid State Chemistry 77, no. 2 (December 1988): 275–80. http://dx.doi.org/10.1016/0022-4596(88)90249-6.

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32

Elsayed, E. Mostafa, Mohamed M. Rashad, H. F. Y. Khalil, M. R. Hussein, M. M. B. El-Sabbah, and I. A. Ibrahim. "Electrochemical Performance of Nanocrystalline Zinc Ferrite Films Synthesized Using Electrodeposition." Key Engineering Materials 835 (March 2020): 1–6. http://dx.doi.org/10.4028/www.scientific.net/kem.835.1.

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Nanocrystalline spinel zinc ferrite ZnFe2O4 thin film has been studied and synthesized via the electrodeposition-anodization process. Electrodeposited ZnFe2 alloys were obtained from aqueous sulphate bath. The resulted alloys were electrochemically oxidized in strong alkaline solution (1 M KOH) at room temperature to the analogous hydroxides. The electroanodized ZnFe2 alloy film was annealed in air at 400 °C for 2 h to get the required zinc ferrite. The electrochemical factors controlling of the electrodeposition of ZnFe2 alloys such as the bath temperature, agitation, the current density were studied and optimized. The crystal structure, crystal size and microstructure of the produced ferrites were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The deposited film was mainly composed of ZnFe2O4 based on XRD studies. The produced film had a spinel structure and the crystallite size was 4.9 nm. SEM micrograph of the resulted zinc ferrite particles shows compact crystallites shapes and agglomerated chains with smallest semicircular particles like morphology.
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33

Lin, Jinpei, Yun He, Qing Lin, Ruijun Wang, and Henian Chen. "Microstructural and Mössbauer Spectroscopy Studies ofMg1-x ZnxFe2O4x=0.5,0.7Nanoparticles." Journal of Spectroscopy 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/540319.

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Zinc substituted magnesium ferriteMg1-xZnxFe2O4(x=0.5,0.7)powders have been prepared by a sol-gel autocombustion method. XRD patterns show that the specimens withx=0.5and 0.7 exhibit single-phase spinel structure, and more content of Zn in specimens is favorable for the synthesis of pure Mg-Zn ferrites. Room temperature Mössbauer spectra ofMg1-xZnxFe2O4annealed at 800°C display transition from ferrimagnetic behavior to super paramagnetic behavior with increase in zinc concentration. The Mössbauer spectras of Mg0.5Zn0.5Fe2O4annealed at different temperatures display the magnetic phase change of the ferrite particles.
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34

Fernandes, Ricardo J. C., Carlos A. B. Magalhães, Carlos O. Amorim, Vítor S. Amaral, Bernardo G. Almeida, Elisabete M. S. Castanheira, and Paulo J. G. Coutinho. "Magnetic Nanoparticles of Zinc/Calcium Ferrite Decorated with Silver for Photodegradation of Dyes." Materials 12, no. 21 (October 31, 2019): 3582. http://dx.doi.org/10.3390/ma12213582.

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Magnetic nanoparticles of zinc/calcium ferrite and decorated with silver were prepared by coprecipitation method. The obtained nanoparticles were characterized by UV/Visible absorption, XRD, TEM and SQUID. The mixed zinc/calcium ferrites exhibit an optical band gap of 1.78 eV. HR-TEM imaging showed rectangular nanoplate shapes with sizes of 10 ± 3 nm and aspect ratio mainly between 1 and 1.5. Magnetic measurements indicated a superparamagnetic behavior. XRD diffractograms allowed a size estimation of 4 nm, which was associated with the nanoplate thickness. The silver-decorated zinc/calcium ferrite nanoparticles were successfully employed in the photodegradation of a model dye (Rhodamine B) and industrial textile dyes (CI Reactive Red 195, CI Reactive Blue 250 and CI Reactive Yellow 145). The nanosystems developed exhibited promising results for industrial application in effluent photoremediation using visible light, with the possibility of magnetic recovery.
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35

Chukalkin, Yu G., and A. E. Teplykh. "Magnetic state of nickel-zinc ferrites at high zinc concentrations." Physics of the Solid State 40, no. 8 (August 1998): 1364–65. http://dx.doi.org/10.1134/1.1130559.

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36

Karanskij, V. V., S. V. Smirnov, A. S. Klimov, and E. V. Savruk. "Gradient structures of Ni – Zn ferrites for electromagnetic radiation protection devices." Perspektivnye Materialy 5 (2021): 39–46. http://dx.doi.org/10.30791/1028-978x-2021-5-39-46.

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Increasing the reliability requirements for electromagnetic compatibility of electronic equipment requires the creation of protective coatings that absorb electromagnetic radiation or the development of new radio-absorbing materials. In the frequency range up to 1 GHz, radio-absorbing materials based on Ni – Zn ferrites are of the greatest interest. The absorption of electromagnetic radiation by ferrites occurs due to resonant phenomena at the level of domains and atoms. Improving the performance of ferrites is possible by modifying their surface properties. In this paper, gradient structures for electromagnetic radiation protection products are obtained by treating the surface of Ni – Zn ferrite samples with a low-energy electron beam. To generate the electron beam, a unique development was used — a forevacuum plasma electronic source that allows forming and transporting a beam with a power density of up to 105 W/cm2 under conditions of high pressure and high gas release. As a result of processing, gradient structures were found on the surface of ferrites. A theoretical analysis and experimental study of the obtained structures “non – magnetic conductor – ferrite”, characterized by an increased attenuation coefficient and a reduced reflection coefficient of electromagnetic radiation in the frequency range from 0.5 to 2.5 GHz. The possibility of obtaining near-surface layers depleted in zinc with increased electrical conductivity and reduced magnetic permeability is shown.
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37

Nechvílová, K., and A. Kalendová. "Influencing the anticorrosion efficiency of pigments based on zinc ferrite by conductive polymers." Koroze a ochrana materialu 62, no. 3 (July 1, 2018): 83–86. http://dx.doi.org/10.1515/kom-2018-0012.

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Abstract Generally, organic coatings which contain zinc ferrites are able to protect metal substrate, most often low-carbon steel, by inhibition mechanism. Conductive polymers are using a system of conjugated double-bonds to transfer a charge over the chain thereby providing their own electrical conductivity in the organic coatings. The charge from the chain in combination with the iron substrate generates electrons to the formation of passivation products on the surface of paint film. This paper is focused on combination of zinc ferrite with conductive polymer and using of synergic effect of these two components. The organic coatings were formulated from hematite and specularite on pigments concentration line 5, 10, 20 and 25 wt.% for better recognizing of the effectiveness of zinc ferrite component. The content of the conductive polymer was consistently set at 3 wt.% in each organic coating. A solvent-based epoxy-ester resin was used as a binder. The physico-mechanical and corrosion tests were performed for all samples. The corrosion signs were evaluated on the surface of coating and also on the surface of metal substrate. In the end, the efficiency was compared alone zinc ferrite and alone polymers and also their combinations.
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38

Irvine, John T. S., Alfonso Huanosta, Raul Valenzuela, and Anthony R. West. "Electrical Properties of Polycrystalline Nickel Zinc Ferrites." Journal of the American Ceramic Society 73, no. 3 (March 1990): 729–32. http://dx.doi.org/10.1111/j.1151-2916.1990.tb06580.x.

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39

Arimi, Arsou, Lena Megatif, Luis I. Granone, Ralf Dillert, and Detlef W. Bahnemann. "Visible-light photocatalytic activity of zinc ferrites." Journal of Photochemistry and Photobiology A: Chemistry 366 (November 2018): 118–26. http://dx.doi.org/10.1016/j.jphotochem.2018.03.014.

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40

Ravinder, D. "Elastic behaviour of zinc substituted lithium ferrites." Materials Letters 45, no. 2 (August 2000): 68–70. http://dx.doi.org/10.1016/s0167-577x(00)00078-1.

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41

Reddy, P. V., V. D. Reddy, and D. Ravinder. "Thermopower studies of lithium–zinc mixed ferrites." Physica Status Solidi (a) 127, no. 2 (October 16, 1991): 439–50. http://dx.doi.org/10.1002/pssa.2211270219.

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42

Katsnelson, E. Z., A. G. Karoza, L. A. Meleshchenko, and L. A. Bashkirov. "IR reflection spectra of manganese-zinc ferrites." physica status solidi (b) 152, no. 2 (April 1, 1989): 657–66. http://dx.doi.org/10.1002/pssb.2221520228.

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43

Dias, Anderson, Nelcy Della Santina Mohallem, and Roberto Luiz Moreira. "Dielectric Properties of Hydrothermal Nickel-Zinc Ferrites." Journal de Physique III 6, no. 7 (July 1996): 843–52. http://dx.doi.org/10.1051/jp3:1996104.

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44

Hochschild, Rainer, and Hartmut Fuess. "Rare-earth doping of nickel zinc ferrites." Journal of Materials Chemistry 10, no. 2 (2000): 539–42. http://dx.doi.org/10.1039/a905583e.

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45

Ravinder, D. "Dielectric behaviour of mixed lithium-zinc ferrites." Journal of Materials Science Letters 11, no. 22 (1992): 1498–500. http://dx.doi.org/10.1007/bf00729271.

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46

Raman, R., V. R. K. Murthy, and B. Viswanathan. "Magnetic loss studies on lithium zinc ferrites." Journal of Magnetism and Magnetic Materials 102, no. 1-2 (December 1991): 181–83. http://dx.doi.org/10.1016/0304-8853(91)90285-i.

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47

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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48

Youcai, Zhao, and R. Stanforth. "Extraction of zinc from zinc ferrites by fusion with caustic soda." Minerals Engineering 13, no. 13 (November 2000): 1417–21. http://dx.doi.org/10.1016/s0892-6875(00)00123-0.

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49

El-Sayed, A. M. "Electrical conductivity of nickel–zinc and Cr substituted nickel–zinc ferrites." Materials Chemistry and Physics 82, no. 3 (December 2003): 583–87. http://dx.doi.org/10.1016/s0254-0584(03)00319-5.

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50

Van Groenou, A. Broese, and S. E. Kadijk. "Sliding sphere wear test on nickel zinc and manganese zinc ferrites." Wear 126, no. 1 (August 1988): 91–110. http://dx.doi.org/10.1016/0043-1648(88)90111-1.

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