Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет
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- Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Synthesis of New Complex Ferrite Li0.5MnFe1.5O4, Chemical – Physical and Electrophysical ResearchIn this article, the sol-gel method was used as a synthesis method, which shows the physico –chemical nature of the synthesis of a new complex material ferrit Li0.5MnFe1.5O4. The synthesized structure and structure were determined by the method of X-ray phase analysis. According to the analysis indicators, it was found that our compound is single-phase, spinel-structured, and syngony - cubic type. The microstructure of the compound and the quantitative composition of the elements contained were analyzed under a scanning electron microscope (SEM). Through a scanning electron microscope, Microsystems were taken from different parts of l Li0.5MnFe1.5O4-type crystallite, the elemental composition of crystals was analyzed, and the general type of surface layer of complex ferrite was shown. As a result, the fact that the compound consists of a single phase, the clarity of its construction was determined by the topography and chemical composition of the compound. As a result, it was found that the newly synthesized complex ferrites correspond to the Formula Li0.5MnFe1.5O4. The particles of the formed compounds have a large size (between 50.0 μm, 20.0 μm and 10.0 μm). Electro physical measurements were carried out on the LCR - 800 unit at intervals of 293-483 K and at frequencies of 1.5 and 10 kHz. The increase in frequency to 10 kHz led to a decrease in the value ε in the range of the studied temperature (293-483 K).Цитирования (OpenAlex) 1 - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, SYNTHESIS AND X-RAY STUDY OF CHROMITE – GADOLINI FERRITE COMPOSITION Gd(1-Х)МeCr0.5Fe0.5O3( Me = Ca, Mg, x≈0,7)(2019-01-01); ; ; In the present work the X-ray study of the synthesized sol-gel by the method of new chromite-ferrites phases with the Gd(1-Х)МeCr0.5Fe0.5O3 (Me = Ca, Mg, x0,7) composition was presented.Chromium oxide, iron oxide, gadolinium oxide, metal carbonates, citric acid and glycerin were used as initial materials. It is shown that the use of citric acid and glycerin as a precipitator has a positive effect on monophase samples. Rainfall was subjected to homogenizing roasting in the temperature range 600-900°C. The reaching the level of sintering of samples was controlled by theX-ray diffraction profiles. The phase composition, crystal characteristics, type of the symmetry, unit cell parameters, radiographic and pycnometric densitieswere investigated by the method of X-ray phase analysis. The correctness of the X-ray diffraction results of the mixed ferrite complex was confirmed by a good agreement between the experimental and calculated values of the inverse values of the squares to the interplanar distances (104/d2). Satisfactory consistency of the X-ray values and pycnometric densities proves the correctness of the experimental results. The article presents results of synthesis and XRF studies of new complex oxide chromite–gadolinium ferrites doped with alkaline earth metals (Са, Mg). Results revealed the formation of samples with multifaceted structure. Developed oxide of the chromite – ferrite gadolinium has orthorhombic structure. References [1] Zvezdin A.K., Pyatakov A.P. Phase transitions and the giant magnetoelectric effect in multiferroics // UFN. 2004. Vol. 174, N 4. P. 465-470. [2] Devi P.S. (1993). Citrate gel processing of the perovskite lanthanide chromites // Journal of Materials Chemistry. 3(4). 373.doi:10.1039/jm9930300373. [3] Mataev M.M., Sukhodayev P.O., Tursinova Zh.I., Sarsenbaeva Z.B., Seitbek A.Zh. Synthesis, X-ray study and determination of the particle size of manganites // International scientificpractical conference “Development of education and science by modern directions in the field of chemistry, biology, ecology and geography”. 2017. P. 68-70. [4] Mataev М.М., Abdraimova M.R., Saxena S.М., Nuketaeva D.Zh., Zheksembieva B.T. Synthesis and X-Ray Analysis of Complex Ferrites // Key Engineering Materials. ISSN: 1662-9795. Vol. 744. P. 393-398. doi:10.4028/www.scientific.net/ KEM.744.393/© 2017 Trans Tech Publications, Switzerland. [5] Mataev M.M., Saxena S.M., Patrin G.S., Tursinova Zh.Y., Kezdikbayeva A.T., Nurbekova M.A., Baitasheva G.U. Manganite synthesis by different methods // Oriental journal of chemistry. 2018. Vol. 34, N 3. P. 1312-1316. [6] Mataev M.M., Patrin G.S., Tursinova Zh.Y., Abdraimova M.R., Yurkin G.Yu. Synthesis and Magnetic Properties of Crystals Bi2BaFe4O10 // Journal of Siberian Federal University. Mathematics & Physics. 2018. 11(4), 411-4. - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, SYNTHESIS AND X-RAY DIFFRACTION STUDY OF THE CHROMITE-MANGANITESIn this work synthesized new chromite-manganite phases using sol-gel method and their composition was studied by X-ray method. Chromium oxide, manganese oxide, yttrium oxide, metal carbonates, citric acid and glycerin were used as starting materials. It is shown that the use of citric acid and glycerol as precipitant, giving a positive effect to monophase samples. Precipitate was subjected to homogenizing roast in the temperature range from 600 to 1100°C, reaching the level of sintering samples were controlled by the basis of X-ray diffraction profiles. All the X-ray reflection lines have been successfully indexed according to the orthorhombic perovskite structure with space group: Pbnm (62) and with the following parameters: Y(1-x)MgCr0,5Mn0,5O3,(x≈0,7) –а=5.557, b=7.515, с=5.252 A, Z = 4; Y(1-x)BaCr0,5Mn0,5O3, (x≈0,7) –а=9.102, b=5.533, с=7.330 A, Z = 4; Y(1-x)SrCr0,5Mn0,5O3, (x≈0,7) –а=7.109, b=7.436, с=6.756 A, Z = 4. References [1] Lewis N.S., Nocera D.G. Electromicrobiology: An Emerging Reality – A Review // Proc. Natl. Acad. Sci. USA. 2006. N 103. P. 15729. [2] Turner J.A. A Realizable Renewable Energy Future // Science. 1999. N 285. P. 687-689. [3] Kreuter W., Hofmann H. Electrolysis: the important energy transformer in a world of sustainable energy // Int. J. Hydrogen Energy. 1998. N 23. Р. 661-666. [4] Singhal S.C., Kendall K. High-temperature Solid Oxide Fuel Cells: Fundamentals, Design and Applications // High-Temperature Solid Oxide Fuel Cells: Fundamentals, Design and Applications. Elsevier Science, Oxford, UK, 2003. ISSN 1813-1107 3 2019 [5] Chroneos A., Yildiz B., Tarancon A., Parfitt D., Kilner J.A. Prediction of solid oxide fuel cell cathode activity with first-principles descriptors // Energy Environ. Sci. 2011. N 4. Р. 3966-3970. [6] Bockris J.O’M., Otagawa T. The Electrocatalysis of Oxygen Evolution on Perovskites // Elecrochem. Soc. 1984. N 131. Р. 290-302. [7] Man I.C., Su H.-Y., Calle-Vallejo F., Hansen H.A., Martнnez J.I., Inoglu N.G., Kitchin J., Jaramillo T.F., Nшrskov J.K., Rossmeisl J. Universality in Oxygen Evolution Electrocatalysis on Oxide Surfaces // ChemCatChem. 2011. N 3. Р. 1159-1165. [8] Skinner S.J. Recent advances in Perovskite-type materials for solid oxide fuel cell cathodes // Int. J. Inorg. Mater. 2001. N 3. Р. 113-121. [9] Haile S.M. Fuel cell materials and components // Acta Mater. 2003. N 51. Р. 5981-6000. [10] Jacobson A.J. Materials for Solid Oxide Fuel Cells // Chem. Mater. 2010. N 22. Р. 660-674. [11] Suntivich J., Gasteiger H.A., Yabuuchi N., Nakanishi H., Goodenough J.B., Shao-Horn Y. Design principles for oxygen-reduction activity on perovskite oxide catalysts for fuel cells and metal-air batteries // Nat. Chem. 2011. N 3. Р. 546-550. [12] Hong W.T., Risch M., Stoerzinger K.A., Grimaud A., Suntivich J., Shao-Horn Y. Toward the rational design of non-precious transition metal oxides for oxygen electrocatalysis // Energy Environ. Sci. 2015. N 8. Р. 1404-1427. [13] Shabanova N.A., Sarkisov P.D. Osnovy zol-gel tehnologii nanodispersnogo kremnezema. M.: IKTs «Akademkniga», 2004. 208 p. [14] Kasenov B.K., Kasenova Sh.B., Sagintaeva J.I. Dvoinye i troinye manganity, ferrity i khromity elochnyh, elochnozemelnyh i redkozemelnyh metallov // M., 2017. [15] Mataev M.M., Saxena S.M., Patrin G.S., Tursinova Zh.Y., Kezdikbayeva A.T., Nurbekova M.A., Baitasheva G.U. Manganite synthesis by different methods // Oriental jornal of chemistry. 2018. N 34(3). P. 1312-1316. [16] Mataev M.M., Patrin G.S., Tursinova Zh.Y., Abdraimova M.R.,Yurkin G.Yu. Synthesis and Magnetic Properties of crystals Bi2BaFe4O10 // Journal of Siberian Federal University. Mathematics & Physics. 2018. N 11(4). Р. 411-415. - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Synthesis and magnetic properties of Y0,5Ca0,5Cr0,5Mn0,5O3 compoundsIn this work,a solid solution of chromite-manganite of the composition Y0,5Ca0,5Cr0,5Mn0,5O3 was synthesized using the sol-gel method. Based on the results of experimental studies of the magnetostatic properties of the polycrystalline system Y0,5Ca0,5Cr0,5Mn0,5O3. It is found that the predominant is the intracrystalline ferromagnetic interaction, while the intercrystalline interaction is antiferromagnetic in nature.In the field of 2000 Oe and 5000 Oe at a temperature of 5 K, the magnetic moment is not even positive. These dependencies were obtained after the sample was in a large negative field. This initial moment is approximately equal to the residual moment on the hysteresis loop for a temperature of 5 K. When the external field is increased gradually, for example, in increments of 250 Oe, this moment increases to 1.2 emu/g at 2000 Oe. Based on the results of magnetostatic measurements, it was found that hysteresis loops of magnetization are observed at low temperatures. - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Multifaceted Characterization and Thermal Stability of Y0.5Sr0.5Cr0.5Mn0.5O3 Chromite-Manganite Synthesized via Sol-GelWe studied the thermal stability and many-sided properties of Y 0 .5 Sr 0 .5 Cr 0 .5 Mn 0 .5 O 3 chromite-manganite that was made using the sol-gel method.We focused on the syngony type, unit cell parameters, and x-ray analysis.To conirm the results of the chromite-manganite indexing, the inverse values of the squares of interplane distances (104/d2) and the consistency of the x-ray and pycnometric densities were found to be very close to each other.It was found that the synthesised chromite-manganite crystallises in orthorhombic syngony and has a perovskite-like structure.Scanning Electron Microscopy (SEM) shows that chromite-manganite is uniformly distributed, and the crystallites are sized between 6 and 20 microns.The analysis of the relationship between heat capacity and temperature using the Thermo Gravimetry Analysis (TGA) technique demonstrates the stability of the internal structure and the presence of polymorphic transformations in the sample under study. - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Synthesis and physico –chemical characteristics of complex ferriteCrNaFe2O5(2024-03-15); ; ; Цитирования (OpenAlex) 3Цитирования (OpenCitations) 2 - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Synthesis and structure of polycrystals MnCo2O4-GdCrO4The article discusses the synthesis and structure of polycrystalline nanocomposite MnCo2O4-GdCrO4 material. The sol-gel method was used as a synthesis of the study. Using X-ray phase analysis (XPA), the structure of the synthesized nanomaterial composition was determined: spinel – cobalt manganate and perovskite – gadolinium chromite. Based on the results of the analysis, it was established that the polycrystalline two-phase composite is a system of spinel-cubic and perovskite-tetragonal types. Morphological analysis of the nanocomposite was carried out using a scanning electron microscope (SEM). According to the data obtained as a result of SEM, the elemental composition was confirmed and the average nanosize of the nanomaterial was obtained, and the content of the compound increased to x2000 was determined, the particle size of MnCo2O4 is 383-281 nm, GdCrO4 – 1.63-1.34 µm; increased to x4000, particle size – MnCo2O4 277-219 nm, GdCrO4 – 1.48-1.27 µm; increased to x6000, particle size – MnCo2O4 239-209 nm, GdCrO4 –1.21-1.07 µm. - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Synthesis of New Complex Ferrite Li0.5MnFe1.5O4: Chemical–Physical and Electrophysical Research(Multidisciplinary Digital Publishing Institute, 2024-07-30); ; ; ; In this article, the sol–gel method was used as a synthesis method, which shows the physicochemical nature of the synthesis of a new complex material, ferrite Li0.5MnFe1.5O4. The structure and composition of the synthesized ferrite were determined by X-ray phase analysis. According to analysis indicators, it was found that our compound is a single-phase, spinel-structured, and syngony-cubic type of compound. The microstructure of the compound and the quantitative composition of the elements contained within it were analyzed under a scanning electron microscope (SEM). Under a scanning electron microscope, microsystems were taken from different parts of Li0.5MnFe1.5O4-type crystallite; the elemental composition of crystals was analyzed; and the general type of surface layer of complex ferrite was shown. As a result, given the fact that the compound consists of a single phase, the clarity of its construction was determined by the topography and chemical composition of the compound. As a result, it was found that the newly synthesized complex ferrites correspond to the formula Li0.5MnFe1.5O4. The particles of the formed compounds have a large size (between 50.0 μm or 20.0 μm and 10.0 μm). Electrophysical measurements were carried out on an LCR-800 unit at intervals of 293–483 K and at frequencies of 1.5 and 10 kHz. An increase in frequency to 10 kHz led to a decrease in the value ε in the range of the studied temperature (293–483 K).Цитирования (OpenAlex) 4Цитирования (OpenCitations) 4 - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Novel Spinel Li–Cr Nano-Ferrites: Structure, Morphology, and Electrical/Dielectric Properties(Multidisciplinary Digital Publishing Institute, 2025-10-26); ; ; ; This article reports on the synthesis and physicochemical characterization of a novel complex ferrite material, LiCr3.4Fe1.6O8, prepared via the sol-gel method. X-ray diffraction (XRD) analysis confirmed that the synthesized compound is a single-phase material with a spinel-type structure and cubic symmetry. Raman spectroscopy was employed to investigate the vibrational modes, and the observed peaks corresponding to Fe–O and Cr–O bonds further validated the spinel-like structure of the compound. The microstructure and elemental composition were examined using scanning electron microscopy (SEM). Multiple regions of the LiCr3.4Fe1.6O8 crystals were analyzed, revealing a homogeneous phase and providing detailed insight into the morphology and chemical composition of the surface. The synthesized ferrite particles exhibited relatively large dimensions, with sizes measured at approximately 5, 30, 100, and 200 μm. The dielectric behavior was studied to assess the material’s response to an external electric field, demonstrating its capacity for electric charge polarization. Both capacitance and electrical conductivity were found to increase with rising temperature. Electrophysical measurements were conducted using the LCR-800 system over a temperature range of 293–483 K and at frequencies of 1.5 kHz and 10 kHz. An increase in frequency to 10 kHz resulted in a decrease in the dielectric constant (ε) across the entire temperature range.Цитирования (OpenAlex) 3Цитирования (OpenCitations) 1 - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Structure Property–Application Relationships of Spinel Ferrite Nanoparticles: From Synthesis to Functional Systems(Multidisciplinary Digital Publishing Institute, 2026-02-24); ; ; ; Krishnamoorthy Ramachandran). The physicochemical principles, advantages, and limitations of various synthesis techniques-including co-precipitation, combustion, sol-gel, thermal decomposition, hydrothermal, solvothermal, microwave-assisted, sonochemical, electrochemical, and solid-state reaction methods-are comparatively discussed. The influence of synthesis parameters on crystal structure, morphology, and cation distribution between tetrahedral and octahedral sites, as well as on magnetic, dielectric, and optical properties, is critically analyzed. Furthermore, the capabilities of characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive spectroscopy (SEM/EDS), Fourier-transform infrared spectroscopy (FTIR), FT-Raman spectroscopy, dielectric measurements, and magnetic measurements for investigating spinel ferrites are comprehensively summarized. Finally, the high potential of spinel ferrite nanoparticles for applications in electronics, microwave devices, water treatment, catalysis, sensors, and biomedical fields is highlighted.Цитирования (OpenAlex) 28