Abstract
The results of the study of ceramic materials obtained by partial substitution of MgO in the 2MgO×2Al2O3×5SiO2 (cordierite) with transition metal oxides FeO, MnO, CuO and ZnO, are presented The modification of the magnesium-aluminosilicate system led to intensification of the phase formation and improved the ceramics properties. In the systems modified with the oxides basic by their chemical nature (MnO, FeO) solid solutions formed Mg2−y R y Al4Si5O18 (0.5 < y <1.5), which, according to X-ray analysis, are close to high-and low-temperature modifications of cordierite, where R is Mn(II) or Fe(II). The qualitative phase composition of the materials modified with oxides of amphoteric nature (ZnO, CuO) is characterized by the presence of silicate and aluminate solid solutions Mg1−x R x Al2O4 (0.25 < x < 0.75), where R is Cu(II) or Zn. The activation energies of the studied processes and standard heats of formation of products were determined.
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Original Russian Text © O.I. Salychits, S.E. Orekhova, 2011, published in Zhurnal Obshchei Khimii, 2011, Vol. 81, No. 5, pp. 711–718.
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Salychits, O.I., Orekhova, S.E. Comprehensive study of the process of formation of the ceramic material with the composition 1.5MgO·0.5RO·2Al2O3·5SiO2 [R = Mn(II), Fe(II), Cu(II), or Zn]. Russ J Gen Chem 81, 799–806 (2011). https://doi.org/10.1134/S1070363211050021
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DOI: https://doi.org/10.1134/S1070363211050021