Phase Composition of Heat-Treatment Products in the ZrO(OH)2–Y(OH)3–FeOOH System

Abstract

The phase composition of the heat-treatment products in the ZrO(OH)2–Y(OH)3–FeOOH system is determined as a function of the precipitation procedure and calcination temperature (620–1570 K) for the compositions 0.97ZrO2· xY2O3· yFe2O3(x+ y= 0.03; x= 0, 0.01, 0.015, 0.02, 0.03) and (1 – x– y)ZrO2· xY2O3· yFe2O3(x= y= 0.02, 0.025, 0.03, 0.04). At a given ZrO2: stabilizer ratio, partial substitution of Fe3+for Y3+increases the degree of ZrO2stabilization and retards the low-temperature degradation of the material.