Abstract
A comparative study of phase formation in aluminum-and chromium-magnesium spinels produced from chemically coprecipitated mixtures is performed. It is shown that the significant difference in the processes of formation of the specified spinels under thermal treatment is caused by the reaction between MgO and Al2O3 in precipitation, leading to the formation of crystal hydrate Mg5Al4O11 · 15H2O. The formation of chromium-magnesium spinel proceeds much more slowly and requires higher temperatures. It is established that fine chemical synthesis of spinels MgO · Al2O3 and MgO · Cr2O3 decreases the temperature of synthesis by 400–500 and 150–200°C, respectively, compared to traditional solid-phase synthesis.
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References
N. A. Toropov, V. P. Barzakovskii, V. V. Lapin, et al., Phase Diagrams of Silicate Systems. A Reference Book, Issue 1 [in Russian], Nauka, Moscow-Leningrad (1965).
V. S. Komarov, N. S. Trofimenko, and A. I. Rat’ko, “Production and properties of porous spinels,” Zh. Prikl. Khim., 61(3), 479–484 (1988).
T. F. Limar’, Yu. A. Kagan, L. A. Shepelenko, et al., “Mechanism and kinetics of formation of magnesian spinel from nitrates,” Izv. Akad. Nauk SSSR, Ser. Neorg. Mater., 8(3), 500–504 (1972).
K. Hamano, Z. Hakagawa, and M. Sakaguchi, “Effect of MgO/Al2O3 ratio on sintering of spinel ceramics,” Rep. Res. Lab. Eng. Mater. Tokyo Inst. Technol., 50(9), 101–111 (1984).
N. A. Toropov and N. A. Sirazhiddinov, “The effect of oxides of rare-earth elements on the kinetics of magnesium aluminate formation in a solid phase,” Uzb. Khim. Zh., No. 5, 38–42 (1963).
E. S. Lukin, “The effect of method of synthesis and conditions of preparing oxide powders in technology of high-density transparent ceramics,” in: Proc. of the D. I. Mendeleev MKhTI, Issue 123 [in Russian], Moscow (1982), pp. 5–16.
M. D. Éfros, G. S. Lemeshonok, and M. F. Ermolenko, “The effect of production method and component ratio on the phase composition and sorption properties of Al2O3 · MgO,” Vestsi Akad. Navuk BSSR, Ser. Khim. Navuk, No. 4, 14–18 (1971).
S. Kameswazi and R. V. Tamhankar, “Transition from normal spinel to defect spinel,” Indian J. Technol., 11, 600–603 (1973).
V. A. Dzis’ko, A. S. Ivanova, L. M. Plyasova, et al., “Chemical and phase composition and surface area of aluminomagnesian system,” Izv. Akad. Nauk SSSR, Ser. Khim., No. 5, 983–986 (1978).
A. S. Ivanova, V. A. Dzis’ko, and S. V. Ketchik, “The effect of methods for producing solid phases in MgO-Al2O3-H2O system on their properties,” Zh. Neorg. Khim., 25(9), 2330–2335 (1980).
L. B. Romanovskii, Magnesian-Spinelide Refractories [in Russian], Metallurgiya, Moscow (1983).
S. S. Apoyan, V. S. Bakunov, and R. Ya. Popil’skii, “Diffusion processes in synthesis of chromium-magnesian spinel,” Steklo Keram., No. 5, 23–25 (1977).
V. Kh. Kuliev, R. Ya. Popil’skii, and V. S. Bakunov, “Formation of phase composition and sintering of magnesite-chromite granular ceramics,” Steklo Keram., No. 6, 22–24 (1983).
M. Louci, I. Arvunescu, and M. Eustafievici, “Sinteza pe cale, chimicé a pulberilor ceramice spinelice MgAl2O4,” Mater. Constr., 23(1), 54–56 (1993).
M. C. Day and J. Selbin, Theoretical Inorganic Chemistry [Russian translation], Khimiya, Moscow (1969).
G. Bokii, Crystallochemistry [in Russian], Nauka, Moscow (1971).
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Translated from Steklo i Keramika, No. 3, pp. 14–16, March, 2006.
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Bobkova, N.M., Radion, E.V. & Sokolovskii1, E.A. Processes of phase formation in heat treatment of chemically precipitated mixtures for aluminum-and chromium-magnesium spinels. Glass Ceram 63, 82–85 (2006). https://doi.org/10.1007/s10717-006-0043-7
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DOI: https://doi.org/10.1007/s10717-006-0043-7