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Ionic and Phase Compositions of Y2.5Ce0.5Fe2.5Ga2.5O12 Ferrogarnet Powder Produced by Gel Combustion
Teterin Yu. A. Smirnova M. N. Maslakov K. I. Teterin A. Yu. Kopeva M. A. Nikiforova G. E. Ketsko V. A. 《Doklady Physical Chemistry》2022,503(2):45-49
Doklady Physical Chemistry - The ionic and phase compositions of Y2.5Ce0.5Fe2.5Ga2.5O12 ferrogarnet samples obtained by gel combustion with subsequent vacuum annealing were studied for the first... 相似文献
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V. A. Ketsko E. N. Beresnev M. A. Kop’eva L. V. Elesina A. I. Baranchikov A. I. Stognii A. V. Trukhanov N. T. Kuznetsov 《Russian Journal of Inorganic Chemistry》2010,55(3):427-429
This work demonstrates the possibility of preparing solid solutions in the (MgGa2O4)
x
(MgFe2O4)1 − x
system by pyrohydrolytic and solid-phase methods. It is shown that the products obtained have different specific surface
areas depending on the ratio between metal nitrates and citric acid. The composition dependence of the unit cell parameter
deviates considerably from the Vegard’s rule. The compounds obtained are found to be stable up to 300°C, which makes them
candidate materials for electronics. 相似文献
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E. N. Beresnev M. N. Smirnova N. P. Simonenko S. V. Makaev M. A. Kop’eva O. B. Kuznetsova V. A. Ketsko 《Russian Journal of Inorganic Chemistry》2016,61(8):1026-1030
The thermal behavior of the gels that are formed in the synthesis of MgFe1.6Ga0.4О4 powders was studied by differential scanning calorimetry and thermogravimetry (DSC–TG). The combustion temperatures of the gels in flowing air and flowing argon were determined from experimental data and thermodynamic calculations. The calculations of combustion temperatures from the heat flow of reaction versus time are shown to be a reliable tool to determine the parameters of gel combustion. 相似文献
5.
M. N. Smirnova L. V. Goeva N. P. Simonenko E. N. Beresnev M. A. Kop’eva V. A. Ketsko 《Russian Journal of Inorganic Chemistry》2016,61(10):1301-1306
The gel formed in the synthesis of Mg(Fe0.8Ga0.2)2O4 powder from corresponding metal nitrates and glycine was studied by thermal and IR spectral analyses. Being a bidentate ligand, glycine was established to initiate the gel combustion reaction resulting in the oxide of the above composition. Based on the data on ΔH298° and Cp of the reagents and reaction products, the thermodynamic parameters of this process were calculated. 相似文献
6.
M. N. Smirnova M. A. Kop’eva E. N. Beresnev L. V. Goeva N. P. Simonenko G. E. Nikiforova A. V. Trukhanov V. A. Ketsko 《Russian Journal of Inorganic Chemistry》2018,63(10):1257-1261
A powdery material Mg(Fe0.8Ga0.2)2O4 has been prepared by combusting a gel containing magnesium(II), iron(III), and gallium(III) nitrates and a glycine–starch mixture. The gel produced during the synthesis has been studied by thermal analysis (TGA/DSC) and IR spectroscopy. This mixture has been shown to be efficient to produce a homogeneous nanosized powderlike material Mg(Fe0.8Ga0.2)2O4. The morphology and properties of ceramic samples are characterized by scanning electron microscopy, X-ray powder diffraction, neutron diffraction, and vibrational magnetometry. 相似文献
7.
M. N. Smirnova M. A. Kop’eva E. N. Beresnev L. V. Goeva N. P. Simonenko G. E. Nikiforova V. A. Ketsko 《Russian Journal of Inorganic Chemistry》2018,63(4):439-443
A powderlike material of composition MgFe1.6Ga0.4O4 was synthesized by gel combustion using a glycine–hexamethylenetetramine mixture. The gel produced by the synthesis was studied by thermal analysis (TGA/DSC) and IR spectroscopy. This mixture was shown to be efficient for obtaining homogeneous nanosized MgFe1.6Ga0.4O4. The morphology of the powders was characterized by scanning electron microscopy and X-ray powder diffraction analysis. 相似文献
8.
A. V. Trukhanov A. I. Stognij S. V. Trukhanov A. A. Geraskin V. A. Ketsko 《Crystallography Reports》2013,58(3):498-504
Film samples of nominal Mg(Fe0.8Ga0.2)2O4-δ composition were obtained on Si(100) substrates by oxygen-ion-beam sputtering of a Mg(Fe0.8Ga0.2)2O4-δ ceramic target. The film thicknesses were ~200 and ~400 nm. Field dependences of the specific magnetization of ~200-nm films annealed at different temperatures (800–1000°C) have been measured. The crystal structure, surface morphology, and magnetic characteristics of films of different thicknesses (~200 and ~400 nm) are investigated. The reasons for the discrepancy between the specific magnetizations of the films obtained and their ceramic analog are discussed. 相似文献
9.
K. S. Gavrichev A. V. Tyurin M. A. Ryumin A. V. Khoroshilov G. D. Nipan V. A. Ketsko T. N. Kol’tsova I. Yu. Pinus G. A. Buzanov N. A. Votinova 《Russian Journal of Inorganic Chemistry》2009,54(1):1-5
The low-temperature heat capacity of Zn 0.98Co0.02O oxide was measured by adiabatic calorimetry. The formation of a solid solution was shown to be accompanied by a change in the entropy by 0.4 J/(K mol). No anomalies in the heat capacity or the thermal behavior confirming the phase transformations found earlier by other methods were observed. A heat capacity anomaly was revealed below 15 K and tentatively attributed to a change in the magnetic properties of the substance. 相似文献
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