抄録
The tetragonal (t)→←monoclinic (m) phase transition temperature of compositionally homogeneous arc-melted ZrO2-RO1.5 solid solutions (R=Nd, Rm, Er, Yb and Sc) was investigated by TMA (thermomechanical analysis; dilatometer) and high-temperature X-ray diffraction. The t→←m transition was observed in ZrO2-x mol% RO1.5 (x=0, 2 and 4 for R=Nd, Sm, Er and Yb, and x=2, 4, 6 for R=Sc), but not in specimens with higher dopant content. The equilibrium temperature T0t-m between t-and m-phases decreased linearly with an increase of dopant content x, the degree of which |dT0/dx| was larger for dopants with larger ionic radii.
