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Artículos de revistas sobre el tema "Copper Spinel"

Autor: Grafiati

Publicado: 12 de octubre de 2024

Última modificación: 31 de julio de 2025

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1

Białas, Anna, Kamil Rugała, Cezary Czosnek, Grzegorz Mordarski, and Jacek Gurgul. "Copper Aluminum Spinels Doped with Cerium as Catalysts for NO Removal." Catalysts 10, no. 12 (2020): 1388. http://dx.doi.org/10.3390/catal10121388.

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Cu-Ce(Mn)-Al oxide catalysts to NO removal in the broad temperature range were synthesized and tested. The precursor of copper aluminium spinel was obtained with the coprecipitation method. By this method, Cu–Al spinels with various amounts of manganese and cerium were synthesized as well. These oxides crystallized in the structure of inverse spinel; however, Ce doping caused the appearance of additional CeO2 phase as determined by XRD. The samples were mesoporous solids with moderate surface area and porosity measured by low temperature sorption of nitrogen. The addition of another metal to C

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2

Desai, Harshal B., Vijay Togadiya, Promila Dhanda, K. Haleema, and Ashish R. Tanna. "Photocatalytic activity of copper nanoferrite and activated carbon-copper nanoferrite composite." E3S Web of Conferences 619 (2025): 05009. https://doi.org/10.1051/e3sconf/202561905009.

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The sol-gel auto-combustion method was used to synthesize copper nanoferrite and activated carbon-copper nanoferrite composite. The stoichiometric chemical proportions of Cu, Fe, and O were confirmed by EDX, and the porosity was checked by SEM of synthesized specimens. The spinel phase copper nanoferrite was confirmed by XRD. The octahedral and tetrahedral force constants were calculated using FTIR spectra of pristine and activated carbon–copper nanoferrite composite. The experiments of Methylene blue’s degradation in sunlight with H2O2 and loading of synthesized specimens were carried out. Th

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3

Fan, Fenglan, Lingjuan Wang, Lei Wang, Jinyu Liu, and Minghui Wang. "Low-Temperature Selective NO Reduction by CO over Copper-Manganese Oxide Spinels." Catalysts 12, no. 6 (2022): 591. http://dx.doi.org/10.3390/catal12060591.

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Selective catalytic reduction of NO with CO (CO-SCR) has been suggested as an attractive and promising technology for removing NO and CO simultaneously from flue gas. Manganese-copper spinels are a promising CO−SCR material because of the high stability and redox properties of the spinel structure. Here, we synthesized CuxMn3−xO4 spinel by a citrate-based modified pechini method combining CuO and MnOx, controlling the molar Cu/Mn concentrations. All the samples were characterized by SEM, EDX, XRD, TEM, H2−TPR, XPS and nitrogen adsorption measurements. The Cu1.5Mn1.5O4 catalyst exhibits 100% NO

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4

Mandal, Siba Prasad. "Analysis of DC Conductivity and I-V Characterization of Nanocrystalline Copper Ferrite Sample at and above Room Temperature." Materials Science Forum 1103 (October 25, 2023): 121–28. http://dx.doi.org/10.4028/p-s3luqw.

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Spinel copper ferrite nanoparticles have wide spread technological applications. Polycrystalline copper ferrite nanoparticles is prepared by sonochemical method. The structural property is investigated by X-ray diffraction study, which reveals cubic spinel structure of copper ferrite NPs with average crystalline size of 20 nm. The temperature variation of DC conductivity of copper ferrite nanoparticles is studied. The conductivity is observed to increase with temperature which implies semiconducting nature of copper ferrite. The Mott study reveals that conduction process is three dimensional i

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5

Ahmed, Awad I., S. E. Samra, and S. A. El-Hakam. "Structural and surface aspects of thermally treated copper aluminium mixed hydroxides." Canadian Journal of Chemistry 69, no. 10 (1991): 1511–15. http://dx.doi.org/10.1139/v91-223.

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CuO–Al2O3 catalysts containing various amounts of copper oxide have been prepared by precipitation. The phase changes were studied by X-ray diffraction. The results obtained revealed that the thermal treatment of solid CuO–Al2O3 at 700 °C produced only crystalline CuO. Heating to 900 °C led to the formation of copper alumina spinel together with unreacted CuO and γ-Al2O3. The spinel content was found to increase with increasing copper content. Nitrogen adsorption–desorption isotherms on the calcined samples have been measured. Surface areas have been calculated and the pore structure analysed.

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6

Othéro de Brito, Vera Lúcia, Stéphanie Alá Cunha, Ana Paula Ribeiro Uchoas, Fabiana Faria de Araújo, Cristina Bormio Nunes, and Luis Antonio Genova. "Evaluation of the Sinterability of Copper-Substituted Ferrites by Means of Dilatometric Thermal Analysis." Materials Science Forum 805 (September 2014): 254–59. http://dx.doi.org/10.4028/www.scientific.net/msf.805.254.

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Cobalt and cobalt-manganese spinel ferrites have magnetostrictive properties suitable for application in magneto-electric and magneto-mechanical transducers. In this work, copper-substituted ferrites of these compositions were processed by means of the ceramic method and their sinterabilities were evaluated by dilatometric thermal analyses. The results obtained suggest that copper affects the solid-state reactions for the spinel formation and lowers the required sintering temperature for the ferrites. However, the densification obtained with sintering of the copper-substituted ferrites at 950o

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7

Sahu, Sulata K., and Alexandra Navrotsky. "Thermodynamics of copper‐manganese and copper‐iron spinel solid solutions." Journal of the American Ceramic Society 100, no. 8 (2017): 3684–92. http://dx.doi.org/10.1111/jace.14813.

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8

Flores-Lasluisa, Jhony Xavier, Javier Quílez-Bermejo, Ana Cristina Ramírez-Pérez, Francisco Huerta, Diego Cazorla-Amorós, and Emilia Morallón. "Copper-Doped Cobalt Spinel Electrocatalysts Supported on Activated Carbon for Hydrogen Evolution Reaction." Materials 12, no. 8 (2019): 1302. http://dx.doi.org/10.3390/ma12081302.

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The development of electrocatalysts based on the doping of copper over cobalt spinel supported on a microporous activated carbon has been studied. Both copper–cobalt and cobalt spinel nanoparticles were synthesized using a silica-template method. Hybrid materials consisting of an activated carbon (AC), cobalt oxide (Co3O4), and copper-doped cobalt oxide (CuCo2O4) nanoparticles, were obtained by dry mixing technique and evaluated as electrocatalysts in alkaline media for hydrogen evolution reaction. Physical mixtures containing 5, 10, and 20 wt.% of Co3O4 or CuCo2O4 with a highly microporous ac

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9

Komova, Oksana V., Valentina I. Simagina, Alena A. Pochtar, et al. "Catalytic Behavior of Iron-Containing Cubic Spinel in the Hydrolysis and Hydrothermolysis of Ammonia Borane." Materials 14, no. 18 (2021): 5422. http://dx.doi.org/10.3390/ma14185422.

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The paper presents a comparative study of the activity of magnetite (Fe3O4) and copper and cobalt ferrites with the structure of a cubic spinel synthesized by combustion of glycine-nitrate precursors in the reactions of ammonia borane (NH3BH3) hydrolysis and hydrothermolysis. It was shown that the use of copper ferrite in the studied reactions of NH3BH3 dehydrogenation has the advantages of a high catalytic activity and the absence of an induction period in the H2 generation curve due to the activating action of copper on the reduction of iron. Two methods have been proposed to improve catalyt

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10

Zhao, B., P. Hayes, and E. Jak. "Effects of CaO, Al2O3 and MgO on liquidus temperatures of copper smelting and converting slags under controlled oxygen partial pressures." Journal of Mining and Metallurgy, Section B: Metallurgy 49, no. 2 (2013): 153–59. http://dx.doi.org/10.2298/jmmb120812009z.

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Phase equilibria of silicate slags relevant to the copper smelting/converting operations have been experimentally studied over a wide range of slag compositions, temperatures and atmospheric conditions. Selected systems are of industrial interest and fill the gaps in fundamental information required to systematically characterise and describe copper slag chemistry. The experimental procedures include equilibration of synthetic slag at high temperatures, rapid quenching of resulting phases, and accurate measurement of phase compositions using electron probe X-ray microanalysis (EPMA). The effec

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11

Wang, N., M. Chen, Z. Zou, Z. Zhang, Y. Xiao, and Y. Yang. "Liquidus and phase equilibria in CaO-Al2O3-FeOx-SiO2 system under intermediate oxygen partial pressure." Journal of Mining and Metallurgy, Section B: Metallurgy 49, no. 2 (2013): 139–44. http://dx.doi.org/10.2298/jmmb120826014w.

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Phase equilibria of silicate slags relevant to the copper smelting/converting operations have been experimentally studied over a wide range of slag compositions, temperatures and atmospheric conditions. Selected systems are of industrial interest and fill the gaps in fundamental information required to systematically characterise and describe copper slag chemistry. The experimental procedures include equilibration of synthetic slag at high temperatures, rapid quenching of resulting phases, and accurate measurement of phase compositions using electron probe X-ray microanalysis (EPMA). The effec

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12

Ye, Ming Quan, Ai Jun Han, Zhou Shuo Chu, Jian Fei Che, and Chen Wang. "Synthesis and Characterization of Mn-Doped Copper Chromite Black Pigments." Advanced Materials Research 602-604 (December 2012): 71–75. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.71.

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Mn-doped black pigments CuMnxCr2-xO4(x=0, 0.05, 0.10, 0.15, 0.20 and 0.25) were synthesized by precursor coprecipitation method, and characterized by TG-DTA, XRD, FTIR and colorimetric analysis. The TG-DTA curves showed the crystal transition temperature was at about 800°C and mass loss ended at about 450°C. The infrared spectra displayed vibrations of spinel phase. XRD patterns displayed the characteristic peaks of the tetragonal phase spinel structure and proved that Mn substituted Cr in the spinel crystal lattice. L*a*b* analysis showed that all samples are black pigments with blue intensit

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13

Adarakatti, Shashidhar N., Veeresh S. Pattar, Prashant K. Korishettar, et al. "Synthesis, Structural and Electrical Studies of Li-Ni-Cu Nano Ferrites." Acta Chemica Iasi 26, no. 1 (2018): 1–12. http://dx.doi.org/10.2478/achi-2018-0001.

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Abstract Li-Ni ferrite has gained great scientific elicit owing to of its unparalleled properties and applications. The copper doped Li-Ni ferrite has been synthesized by sucrose method. The structure was characterized by X-ray diffraction, which has confirmed the formation of single-phase spinel structure. X-ray diffraction and FTIR data reveals the formation of cubic structure phase. Unit cell parameters vary with copper content; overall variation of the unit cell parameters obeys Vegard’s law. The main absorption bands of spinel ferrite have appeared through IR absorption spectra recorded i

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14

de WILDE, E., I. BELLEMANS, M. CAMPFORTS, et al. "Sessile drop evaluation of high temperature copper/spinel and slag/spinel interactions." Transactions of Nonferrous Metals Society of China 26, no. 10 (2016): 2770–83. http://dx.doi.org/10.1016/s1003-6326(16)64344-3.

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15

Mindru, Ioana, Dana Gingasu, Luminita Patron, et al. "Copper aluminate spinel by soft chemical routes." Ceramics International 42, no. 1 (2016): 154–64. http://dx.doi.org/10.1016/j.ceramint.2015.08.058.

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16

Heni, Souhir, Sobhi Hcini, Mohamed Lamjed Bouazizi, Lamjed HajTaieb, Abdessalem Dhahri, and Habib ben Bacha. "Improving the optical properties of magnesium spinel chromites through Ni and Cu substitutions for optoelectronic applications." RSC Advances 14, no. 36 (2024): 26340–53. http://dx.doi.org/10.1039/d4ra03342f.

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17

M., Ankushev, Zaykov V., Molchanov I., Koryakova L., Panteleyeva S., and Yuminov A. "Metallurgical Slags and Ore Fragments from the Kamenny Ambar Bronze Age Settlement (Southern Urals): a Key to Knowledge of Copper Sources." Teoriya i praktika arkheologicheskikh issledovaniy 33, no. 1 (2021): 34–57. http://dx.doi.org/10.14258/tpai(2021)33(1).-03.

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Abstract: The paper presents the characteristics of metallurgical slags and copper ore fragments from the Kamenny Ambar settlement of the Bronze Age. According to the mineral and chemical compositions we have distinguished two types of the slags: Cr-rich spinel containing olivine slags and sulfide-containing olivine slags. The Cr-rich spinel containing olivine slags are the product of oxidized ore from the copper deposits in ultramafic rocks exploited in the early Sintashta-Petrovka period the settlement functioning. The sulfide-containing olivine slags are the result of the secondary sulfide

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18

Flores, Ariadna, Karina Nesprias, Paula Vitale, et al. "Heterogeneous Photocatalytic Discoloration/Degradation of Rhodamine B with H2O2 and Spinel Copper Ferrite Magnetic Nanoparticles." Australian Journal of Chemistry 67, no. 4 (2014): 609. http://dx.doi.org/10.1071/ch13435.

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The discoloration/degradation of the artificial dye Rhodamine B (RhB) was investigated using advanced oxidation technologies. Aqueous solutions of RhB containing spinel copper ferrites (CuFe2O4) as a heterogeneous catalyst were exposed to UV irradiation/hydrogen peroxide. Under these experimental conditions the discoloration/degradation of RhB is strongly promoted by copper ferrites, reaching 95 % discoloration of the dye in 10 min and 97 % degradation in 200 min. The influence of the catalyst amount, H2O2 concentration, light source, and UV light intensity were studied. Optimum concentrations

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19

Ajeesha, T. L., Ashwini Anantharaman, Jeena N. Baby, and Mary George. "Structural, Magnetic, Electrical and Photo-Fenton Properties of Copper Substituted Strontium M-Hexagonal Ferrite Nanomaterials via Chemical Coprecipitation Approach." Journal of Nanoscience and Nanotechnology 20, no. 3 (2020): 1589–604. http://dx.doi.org/10.1166/jnn.2020.17132.

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Copper substituted strontium ferrite nano spinels were synthesized by facile chemical coprecipitation method. Structural properties of all the nano materials were examined using Powder X-ray Diffraction of size ranging 22–50 nm and High Resolution Transmission Electron Microscopy which further revealed the formation of hexagonal spinel structure. The analysis of FT-IR spectra of all the samples confirmed the formation of M–O bond with spinel structure having characteristic peaks at 422 cm-1 and 586 cm-1. All the samples were subjected to dielectric studies at room temperature. A quite narrow b

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20

Shapovalov, V. A., H. Szymczak, S. Piechota, and V. V. Shapovalov. "Jahn-Teller Effect in Copper-Doped Spinel Group." Le Journal de Physique IV 07, no. C1 (1997): C1–243—C1–244. http://dx.doi.org/10.1051/jp4:1997193.

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21

Kishimoto, Y., T. Ohno, T. Kanashiro, K. Miyatani, and M. Ishikawa. "NMR study of spinel type copper sulfide Cu1.5Rh1.5S4." Physica C: Superconductivity 235-240 (December 1994): 1635–38. http://dx.doi.org/10.1016/0921-4534(94)92042-7.

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22

Aminov, T. G., E. V. Busheva, and G. G. Shabunina. "Magnetic Properties of Copper–Indium Doped Spinel FeCr2S4." Russian Journal of Inorganic Chemistry 64, no. 12 (2019): 1592–99. http://dx.doi.org/10.1134/s0036023619120039.

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23

De Wilde, Evelien, Inge Bellemans, Mieke Campforts, et al. "Investigation of High-Temperature Slag/Copper/Spinel Interactions." Metallurgical and Materials Transactions B 47, no. 6 (2016): 3421–34. http://dx.doi.org/10.1007/s11663-016-0805-8.

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24

Soni, Himanshi, Roberto Acevedo, Nammrta Singh, Pushpender Sharma, and Zaid Ajzan. "A comprehensive review on the potential of copper spinel ferrite for gas sensing application." E3S Web of Conferences 588 (2024): 02011. http://dx.doi.org/10.1051/e3sconf/202458802011.

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Copper spinel ferrite (CuFe₂O₄) is a promising material for the gas sensing due to its unique structural, electrical, and catalytic properties. This review focuses on the gas sensing capabilities of copper ferrite. Copper ferrite’s inverse spinel structure, rich in oxygen vacancies and flexible cation distribution, enables effective gas adsorption, making it highly sensitive to reducing and oxidizing gases. Various synthesis methods, determines the material’s particle size, morphology, and surface area, which are essential for optimizing gas sensing performance. Doping with the transition meta

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25

Tang, Yuanyuan, Kaimin Shih, and King Chan. "Copper aluminate spinel in the stabilization and detoxification of simulated copper-laden sludge." Chemosphere 80, no. 4 (2010): 375–80. http://dx.doi.org/10.1016/j.chemosphere.2010.04.048.

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26

Shabelskaya, Nina, Asatullo Radzhabov, Vitalii Taranushich, Victor Chernyshev, Vasilii Demyan, and Vera Ulyanova. "Synthesis and catalytic properties of nickel (II) - copper (II) ferrite." E3S Web of Conferences 247 (2021): 01020. http://dx.doi.org/10.1051/e3sconf/202124701020.

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This work studies the process of formation of the spinel structure of nickel (II) -copper (II) ferrite. A possible mechanism for the formation of single-phase spinel samples is considered. It consists of the stage of formation of chelate complexes of nickel (II), copper (II), iron (III) cations with citric acid and their subsequent thermal decomposition. The materials obtained are studied by X-ray phase analysis and the BET technique. The catalytic activity of the synthesized ferrite Cu0.5Ni0.5Fe2O4 in the process of oxidative destruction of methyl orange in the presence of hydrogen peroxide i

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27

Usoltseva, Natalya, Valery Korobochkin, Alesya S. Dolinina, and Alexander M. Ustyugov. "Infrared Spectra Investigation of CuO-Al₂O₃ Precursors Produced by Electrochemical Oxidation of Copper and Aluminum Using Alternating Current." Key Engineering Materials 712 (September 2016): 65–70. http://dx.doi.org/10.4028/www.scientific.net/kem.712.65.

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Joint electrochemical oxidation of copper and aluminum using alternating current (AC) was performed. The electrolysis products were dried on air (method carbonate) and at the residual pressure of 3-5 kPa (oxide method). Cu-Al layered double hydroxide (Cu-Al/LDH) are formed at air carbonization. Oxide method saves copper (I) oxide. Heat treatment causes the decomposition of LDH to CuO and Al2O3 as well as Cu2O oxidation to CuO. Copper-aluminum spinel (CuAl2O4) is the product of solid-phase interaction of copper and aluminum oxides. Infrared spectra revealed that oxide method provides the boehmi

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28

Smyrnioti, Maria, and Theophilos Ioannides. "Dimethyl Ether Oxidation over Copper Ferrite Catalysts." Catalysts 12, no. 6 (2022): 604. http://dx.doi.org/10.3390/catal12060604.

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The depletion of fossil energy sources and the legislation regarding emission control demand the use of alternative fuels and rapid progression of aftertreatment technologies. The study of dimethyl ether (DME) catalytic oxidation is important in this respect, as DME is a promising clean fuel and at the same time a VOC pollutant present in the tail gases of industrial processes. In the present work, copper ferrite catalysts synthesized via the citrate complexation method have been evaluated in DME oxidation. N2-physisorption, XRD, H2-TPR, and XPS were employed for the characterization of the mi

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29

Pekov, Igor, Fedor Sandalov, Natalia Koshlyakova, et al. "Copper in Natural Oxide Spinels: The New Mineral Thermaerogenite CuAl2O4, Cuprospinel and Cu-Enriched Varieties of Other Spinel-Group Members from Fumaroles of the Tolbachik Volcano, Kamchatka, Russia." Minerals 8, no. 11 (2018): 498. http://dx.doi.org/10.3390/min8110498.

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This paper is the first description of natural copper-rich oxide spinels. They were found in deposits of oxidizing-type fumaroles related to the Tolbachik volcano, Kamchatka, Russia. This mineralization is represented by nine species with the following maximum contents of CuO (wt.%, given in parentheses): a new mineral thermaerogenite, ideally CuAl2O4 (26.9), cuprospinel, ideally CuFe3+2O4 (28.6), gahnite (21.4), magnesioferrite (14.7), spinel (10.9), magnesiochromite (9.0), franklinite (7.9), chromite (5.9), and zincochromite (4.8). Cuprospinel, formerly known only as a phase of anthropogenic

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30

Stewart, S. J., R. C. Mercader, G. Punte, J. Desimoni, G. Cernicchiaro, and R. B. Scorzelli. "Shifting the Superparamagnetic Limit of Nanosized Copper Iron Spinel." Hyperfine Interactions 156/157, no. 1-4 (2004): 89–95. http://dx.doi.org/10.1023/b:hype.0000043206.60778.18.

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31

Luadthong, Chuleeporn, Pongtanawat Khemthong, Waraporn Nualpaeng, and Kajornsak Faungnawakij. "Copper ferrite spinel oxide catalysts for palm oil methanolysis." Applied Catalysis A: General 525 (September 2016): 68–75. http://dx.doi.org/10.1016/j.apcata.2016.07.002.

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32

Matsukata, Masahiko, Shigeyuki Uemiya, and Eiichi Kikuchi. "Copper–Alumina Spinel Catalysts for Steam Reforming of Methanol." Chemistry Letters 17, no. 5 (1988): 761–64. http://dx.doi.org/10.1246/cl.1988.761.

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33

Murthy, K. S. R. C., and J. Ghose. "CO Oxidation on Substituted Copper Chromite Spinel Oxide Catalysts." Journal of Catalysis 147, no. 1 (1994): 171–76. http://dx.doi.org/10.1006/jcat.1994.1127.

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Amini, Mojtaba, Maryam Hosseinpour Kafshdouzsani, Ali Akbari, Sanjeev Gautam, Cheol-Hwee Shim, and Keun Hwa Chae. "Spinel copper ferrite nanoparticles: Preparation, characterization and catalytic activity." Applied Organometallic Chemistry 32, no. 9 (2018): e4470. http://dx.doi.org/10.1002/aoc.4470.

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35

Zhao, Hongyuan, Fang Li, Xiuzhi Bai, et al. "Enhanced Cycling Stability of LiCuxMn1.95−xSi0.05O4 Cathode Material Obtained by Solid-State Method." Materials 11, no. 8 (2018): 1302. http://dx.doi.org/10.3390/ma11081302.

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The LiCuxMn1.95−xSi0.05O4 (x = 0, 0.02, 0.05, 0.08) samples have been obtained by a simple solid-state method. XRD and SEM characterization results indicate that the Cu-Si co-doped spinels retain the inherent structure of LiMn2O4 and possess uniform particle size distribution. Electrochemical tests show that the optimal Cu-doping amount produces an obvious improvement effect on the cycling stability of LiMn1.95Si0.05O4. When cycled at 0.5 C, the optimal LiCu0.05Mn1.90Si0.05O4 sample exhibits an initial capacity of 127.3 mAh g−1 with excellent retention of 95.7% after 200 cycles. Moreover, when

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36

Zeeshan, Talat, Safia Anjum, Hina Iqbal, and Rehana Zia. "Substitutional effect of copper on the cation distribution in cobalt chromium ferrites and their structural and magnetic properties." Materials Science-Poland 36, no. 2 (2018): 255–63. http://dx.doi.org/10.1515/msp-2018-0011.

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AbstractA series of copper substituted cobalt chromium ferrites, CuxCo1 - xCr0.5Fe1.5O4 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) has been synthesized, by employing powder metallurgy method. Calcination of the samples has been carried out for 24 hours at 1100 °C. The resultant materials have been investigated by using a variety of techniques, including X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM)), scanning electron microscopy (SEM), and ultraviolet visible spectroscopy (UV-Vis). The XRD patterns confirmed that all compositions had a c

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37

Nguyen, Martin, and Radomír Sokolář. "Corrosion Resistance of Novel Fly Ash-Based Forsterite-Spinel Refractory Ceramics." Materials 15, no. 4 (2022): 1363. http://dx.doi.org/10.3390/ma15041363.

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This article aims to investigate the corrosion resistance of novel fly ash–based forsterite–spinel (Mg2SiO4-MgAl2O4) refractory ceramics to various corrosive media in comparison with reactive alumina–based ceramics. Because fly ash is produced in enormous quantities as a byproduct of coal-burning power stations, it could be utilized as an affordable source of aluminum oxide and silicon oxide. Corrosion resistance to iron, clinker, alumina, and copper was observed by scanning electron microscope with an elemental probe. The influence on the properties after firing was also investigated. Fly ash

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38

Adaika, K., M. Diaifi, and C. Liaidi. "Structural, elastic and optical properties of nickel aluminate spinel nano crystalline." Digest Journal of Nanomaterials and Biostructures 16, no. 2 (2021): 669–76. http://dx.doi.org/10.15251/djnb.2021.162.669.

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Ni1-xCuxAl2O4nano-crystalline, was made to synthesize by sol–gel method and study their micro-structural, optical and electrochemical properties. All investigated samples were characterized using different techniques such as X-ray diffraction (XRD), Fouriertransform infrared (FTIR) analysis, thermal gravimetric analysis (TG), and transmission electron microscope (TEM), optical absorption and electrochemical measurements. Powder X-ray diffraction (XRD) analysis was confirmed the formation of single phase, cubic spinel structure without other impurities. Average crystallite sizes of the samples

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39

Zulfugarova, S. M., G. R. Azimova, Z. F. Aleskerova, and D. B. Tagiyev. "BINARY AND TERNARY COPPER FERRITES IN THE OXIDATION OF CARBON MONOXIDE." Chemical Problems 23, no. 3 (2025): 329–42. https://doi.org/10.32737/2221-8688-2025-3-329-342.

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The replacement of noble metal-based catalytic systems with oxide catalysts based on transition metals of variable valency for the oxidation of carbon monoxide, the reduction of catalyst production costs, and simultaneously the reduction of energy costs for carrying out the reaction is a pressing issue. In this work, binary copper ferrites and ternary copper-manganese-iron oxide systems were synthesized for lowtemperature carbon monoxide oxidation using the sol-gel method with self-combustion, as well as using microwave technology. The samples were characterized using X-ray diffraction techniq

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40

Parajuli, D., and K. Samatha. "Structural and cation distribution analysis of Nickel-Copper/Nickel-Magnesium Substituted Lithium Ferrites." BIBECHANA 21, no. 1 (2024): 74–82. http://dx.doi.org/10.3126/bibechana.v21i1.61270.

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Lithium ferrite (Li0.5Fe2.5O4) shows significant promise in electrical and electronic engineering. It possesses a crystal spinel crystal structure denoted as AB2O4, with "A" and "B" representing specific tetrahedral and octahedral lattice sites respectively. Analysis of X-ray diffraction (XRD) patterns aligns well with the JCPDS card (no. 38-0259), confirming the spinel structure with the Fd3m space group. However, an additional peak at 211 in the basic lithium ferrite suggests a subtle Fd3m to the P4132 phase change with a minor secondary hematite phase. Investigating the cation distribution

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41

Klenushkin, Anatoly, Boris Medvedev, Yuri Kabirov, and Mikhail Evdokimov. "Iron Oxide Materials for Positive Electrodes of Lithium and Lithium-Ion Batteries." Advanced Materials Research 705 (June 2013): 46–51. http://dx.doi.org/10.4028/www.scientific.net/amr.705.46.

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New iron cathode materials: strontium hexaferrite, spinel-like ferrites of copper, lithium, and zinc, as well as α-and γ-phases of iron (3+) oxide are proposed. Chronopotentiometry method allowed demonstrating the possibility to use ferrites and iron (3+) oxides as the positive electrode materials for lithium batteries.

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42

Górecka, Sylwia, Kateřina Pacultová, Kamil Górecki, Aneta Smýkalová, Katarzyna Pamin, and Lucie Obalová. "Cu-Mg-Fe-O-(Ce) Complex Oxides as Catalysts of Selective Catalytic Oxidation of Ammonia to Dinitrogen (NH3-SCO)." Catalysts 10, no. 2 (2020): 153. http://dx.doi.org/10.3390/catal10020153.

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Multicomponent oxide systems 800-Cu-Mg-Fe-O and 800-Cu-Mg-Fe-O-Ce were tested as catalysts of selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO) process. Materials were obtained by calcination of hydrotalcite-like compounds at temperature 800 °C. Some catalysts were doped with cerium by the wet impregnation method. Not only simple oxides, but also complex spinel-like phases were formed during calcination. The influence of chemical composition, especially the occurrence of spinel phases, copper loading and impregnation by cerium, were investigated. Materials were characterized by

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43

Everbroeck, Tim Van, Radu-George Ciocarlan, Wouter Van Hoey, Myrjam Mertens, and Pegie Cool. "Copper-Containing Mixed Metal Oxides (Al, Fe, Mn) for Application in Three-Way Catalysis." Catalysts 10, no. 11 (2020): 1344. http://dx.doi.org/10.3390/catal10111344.

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Mixed oxides were synthesized by co-precipitation of a Cu source in combination with Al, Fe or Mn corresponding salts as precursors. The materials were calcined at 600 and 1000 °C in order to crystallize the phases and to mimic the reaction conditions of the catalytic application. At 600 °C a mixed spinel structure was only formed for the combination of Cu and Mn, while at 1000 °C all the materials showed mixed spinel formation. The catalysts were applied in three-way catalysis using a reactor with a gas mixture containing CO, NO and O2. All the materials calcined at 600 °C displayed the remar

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44

Mugnier, Emmanuelle, Isabelle Pasquet, Antoine Barnabé, Lionel Presmanes, Corine Bonningue, and Philippe Tailhades. "Nanocomposites of metallic copper and spinel ferrite films: Growth and self-assembly of copper particles." Thin Solid Films 493, no. 1-2 (2005): 49–53. http://dx.doi.org/10.1016/j.tsf.2005.06.092.

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45

Liu, Tangkang, Di Xu, Dengdeng Wu, Guoliang Liu, and Xinlin Hong. "Spinel ZnFe2O4 Regulates Copper Sites for CO2 Hydrogenation to Methanol." ACS Sustainable Chemistry & Engineering 9, no. 11 (2021): 4033–41. http://dx.doi.org/10.1021/acssuschemeng.0c07682.

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46

Kim, Kwang Joo, Jongho Park, and Jae Yun Park. "Magnetic and Electrical Properties of Spinel Copper Ferrite Thin Films." Journal of Magnetics 23, no. 1 (2018): 1–4. http://dx.doi.org/10.4283/jmag.2018.23.1.001.

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47

Roy, S., and J. Ghose. "Syntheses and studies on some copper chromite spinel oxide composites." Materials Research Bulletin 34, no. 7 (1999): 1179–86. http://dx.doi.org/10.1016/s0025-5408(99)00109-9.

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48

Durr, J., M. Lenglet, and M. H. Thuilier. "The Jahn Teller distortion of copper environment in spinel oxide." Journal de Chimie Physique 86 (1989): 1547–54. http://dx.doi.org/10.1051/jcp/1989861547.

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49

Batool, Kiran, Malika Rani, Ayesha Younus, et al. "Nanosized Magnesium doped Copper Chromites Spinel Particles Synthesis and Characterization." ECS Journal of Solid State Science and Technology 9, no. 12 (2020): 126005. http://dx.doi.org/10.1149/2162-8777/abce00.

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50

Wei, Ping, M. Reza Bateni, and Anthony Petric. "Conversion of copper and manganese metallic films to spinel coating." Journal of Materials Science 47, no. 13 (2012): 5205–15. http://dx.doi.org/10.1007/s10853-012-6404-4.

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