Abstract
The local phase composition was studied in the vicinity of indentations for partially stabilized zirconia crystals doped with rare-earth ions with constant and variable valence. Our aim was to study the effect of co-doping rare-earth ion type (Сe3+, Сe4+, Nd3+ and Yb3+) on the intensity of the tetragonal to monoclinic transition which determines the transformation hardening mechanism in the crystals. We demonstrated the effect of co-doping ion type on the degree of the tetragonal to monoclinic transition. The phase transition is the most intense in ceria ion doped crystals, this being one of the factors contributing to their high fracture toughness.
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