Funct. Mater. 2022; 29 (1): 30-38.

doi:https://doi.org/10.15407/fm29.01.30

Detection of regularities of Y2Zr2O7 pyrochlor phase formation during the reaction of solid-phase synthesis under different temperature-time conditions

V.O.Chyshkala1, S.V.Lytovchenko1, V.P.Nerubatskyi2, R.V.Vovk1, E.S.Gevorkyan2, O.M.Morozova2

1V.N.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
2Ukrainian State University of Railway Transport, 7 Feierbakh Sq., 61050 Kharkiv, Ukraine

Abstract: 

The basic regularities of phase formation in the pyrochlor synthesis depending on temperature regimes have been investigated. The mechanisms of formation and structural-phase evolution in the synthesis of new substances and consolidation of compounds of the Y2O3-ZrO2 system have been considered. Samples of an oxide sintered mass with a fraction of pyrochlorine phase Y2Zr2O7 up to 41 % were obtained. The features of increasing the proportion of pyrochlore, which promotes the activation of a chemical reaction, either by increasing the synthesis temperature to the temperatures of eutectic formation, or by increasing the reaction surface of the powders, are considered. It is established that the kinetics of an increase in pyrochlorine phase proportion in the samples indicates the desired increase in the chemical reaction activity, which can be achieved by increasing the synthesis temperature to the temperature of eutectic formation or increasing the reaction surface of powders.

Keywords: 
eutectic, yttrium oxide, zirconium oxide, pyrochlor, sintering.

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