Properties of nanocrystalline powder in ZrO₂—Y₂O₃—СеО₂— АЬ₂О₃ — СоО system after heat treatment in the temperature range 500 -1200 °С

Abstract

Properties of the nanocrystalline hydrothermal powders with composition (% (тої.)) 86ZrO₂— 2,8Y₂O₃—0,7CeO₂—О,ЗСоО—10Аl₂О₃ were investigated. The hydrothermal powder was produced after hydrothermal treatment of the co-precipitated hydroxides bland. It was found, that low-temperature phase transformation of F-ZrO₂ —> T-ZrO₂ resulted from the heat treatment. Specific surface area of powder decreased from 95 to 1,1 m²/g, average primary particle size varied from 8 to 17 nm. The powder was become cyan after heat treatment at 1200 °С as a result of the cobalt aluminate spinel formation.