ВЛИЯНИЕ ЛЕГИРУЮЩЕЙ ПРИМЕСИ ОКСИДА ИТТРИЯ НА СТРУКТУРУ И СВОЙСТВА КРИСТАЛЛОВ (ZrO₂)0,91−x(Sc₂O₃)0,09(Y₂O₃)х (x = 0÷0,02)

We have studied the influence of dopant Y 2 O 3 oxide (1 and 2 mol.%) on the phase composition, structure and electrical properties of the ZrO 2 — 9 mol.% Sc 2 O 3 solid solution. We have shown that stabilization of ZrO 2 jointly with 9 mol.% Sc 2 O 3 and 2 mol.% Y 2 O 3 allows one to obtain transparent homogeneous crystals with a cubic structure which have a high phase stability. Mechanical grinding of these crystals did not lead to a change in the phase composition of the powders. The powders inherited the original structure of the fluorite crystals. All the test crystals had high microhardness and low fracture toughness. Increasing the concentration of Y 2 O 3 in crystals led to the need to reduce maximum loads on the indenter that the sample could withstand without cracking. We have shown that the conductivity varies nonmonotonically with increasing Y 2 O 3 concentration in the crystals. An increase in the Y 2 O 3 content to 2 mol. % in the composition of the solid electrolyte reduces the conductivity of the crystals in entire temperature range which is caused with a decrease in carrier mobility due to increasing ion radius of the stabilizing ion.