Phase formation and stability of solid solutions in nanosized zirconia based powders, obtained by cryochemical route

Abstract

The paper reports the correlations in the sequence “amorphous phase → metastable crystalline solid solution → stable crystalline solid solution” in nanosized ZrO2, 5CaO—95ZrO2 and 9CaO— 91ZrO2 precursors, obtained by reversed co-precipitation technique with following fast freezing in liquid nitrogen, freeze-drying and pan drying. It has been found that kinetic stabilization of metastable zirconia phases in the required region of temperatures and concentrations can be achieved via correct post-treatment of gels obtained by reversed co-precipitation technique. The use of cryochemical treatment allows to eliminate powders agglomeration up to 1000℃. Refs 22. Figs 6. Tables 4.