Synthesis and study of solid solutions based on indium oxide in the In2O3–ZrO2(HfO2) systems as a material for fuel cell interconnectors

Abstract

Nanocrystalline (8–10 nm) solid solutions on the basis of indium oxide in the systems In₂O₃–ZrO₂ and In₂O₃–HfO₂ are synthesized by hydroxide coprecipitation. It is established that the use of polyvinyl alcohol decreases the degree of agglomeration of precipitates and increases the dispersity of the synthesized powders. The optimal conditions for the consolidation of powders on the basis of In₂O₃ are selected. It is shown that In₂O₃ doping with zirconium and hafnium dioxides significantly increases the electrical conductivity of solid solutions compared to pure indium oxide. The influence of temperature and oxygen partial pressure on the conductivity of solid solutions on the basis of In₂O₃ was investigated.