Funct. Mater. 2022; 29 (1): 118-123.

doi:https://doi.org/10.15407/fm29.01.118

The features of the formation of solid solutions in a pseudo-binary section BaAl2O4-CoAl2O4

G.M.Shabanova1, A.M.Korogodska1, S.M.Logvinkov2, O.O.Gamova1

1Department of Ceramics, Refractories, Glass and Enamels Technology, National Technical University "Kharkiv Polytechnic Institute", 2 Kyrpychova Str., 61002 Kharkiv, Ukraine
2Department of Technology and Life Safety, Simon Kuznets Kharkiv National University of Economics, 9a Nauki Ave., 61166 Kharkiv, Ukraine.

Abstract: 

The article presents an analysis of qualitative and quantitative phase relations in the temperature range of 900°C-1500°C; the analysis was carried out from the point of view of the limitedness of the formed solid solutions in the pseudo-binary section BaAl2O4-CoAl2O4 and made it possible to give an adequate interpretation of the experimental results. The pseudo- binary section BaAl2O4-CoAl2O4 is a promising area for creating compositions of refractory binders based on compositions of the BaO-CoO-Al2O3 system. It was found that the nonmonotonic change in the amount of the main phases in the material of the samples after firing at different temperatures can be explained by the peculiarities of the formed solid solutions based on cobalt-aluminate and barium-aluminate spinels, saturation of their cation sublattices due to the isovalent isomorphism of Co+2 to Co+3 and participation in the cationic substitution of Al+3 in trivalent sublattices. The results obtained make it possible to predict the phase composition of binders in the BaO-CoO-Al2O3 system and regulate their hydration activity.

Keywords: 
solid solution, phase formation, isovalent isomorphism, cationic sublattices, phase decomposition.

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