Existing phases of arc-melted ZrO2-Xmol%RO1.5 specimens were investigated mainly by Raman spectroscopy, which is sensitive to the phase transition induced by the oxygen displacements (0≤X≤24) R = Nd, Sm, Y, Er and Yb). The tetragonal and monoclinic phases coexisted at X = 2 and 4 for R = Nd, Y, Er and Yb, and at X = 2 for R = Sm. Tetragonal single phase is obtained in the specimens with higher contents. The axial ratio c/a decreases with an increase of RO1.5 content and becomes unity at 14 or 16mol% RO1.5 content. The Raman peak intensity at about 470 cm-1, which is characteristic of the tetragonal phase, decreases with an increase of RO1.5 content. The cubic-tetragonal phase boundary determined by Raman scattering is located at about X = 18-19mol% regardless of dopant species R. A tetragonal phase whose axial ratio c/a is unity appears at about X = 16mol%. The compositional locations of the phase boundaries are almost independent of the dopant species R.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics