Formation of a tetragonal structure in partially stabilized zirconia
- Institute of General Physics, Moscow (Russian Federation); and others
The interest in partially stabilized zirconia (PSZ) is explained by the fact that this engineering material exhibits unique thermomechanical features. PSZ materials include a set of (1-x)ZrO{sub 2}{center_dot}XR{sub 2}O{sub 3} (R = Ln, Y, Sc) and (1-x)ZrO{sub 2}{center_dot}xMO (M = Mg, Ca) solid solutions, x corresponding to the two-phase region of their phase diagrams. For R{sub 2}O{sub 3}, the stabilizer content in this region is 2-7 mol %. Microregions with 2-2.5 mol % R{sub 2}O{sub 3} have the T-type tetragonal structure, wheras microregions with 4-8 mol % R{sub 2}O{sub 3} are either tetragonal T{prime} or cubic fluorite (C) solid solutions. Raman-spectroscopic and electron-microscopic studies of the structure of PSZ show that it is made up of T-phase microdomains of {approx_equal}0.5 {mu}m in size formed in the T{prime} - or C-phases. The tetragonal axes in the T-phase are directed strictly along the fourfold axes of the original cubic structure. The dependence of thermomechanical properties of PSZ materials on their structure has generated enhanced interest in the study of the mechanism of formation of the tetragonal phases. The advantages of Raman spectroscopy in studies of the structure of zrO{sub 2}-based solid solutions were indicated in [6-10]. In this work, we use this spectroscopic technique to study the formation of the tetragonal phases in PSZ materials and suggest a new mechanism of their formation.
- OSTI ID:
- 102633
- Journal Information:
- Inorganic Materials, Journal Name: Inorganic Materials Journal Issue: 6 Vol. 30; ISSN INOMAF; ISSN 0020-1685
- Country of Publication:
- United States
- Language:
- English
Similar Records
Raman scattering study of cubic-tetragonal phase transition in Zr[sub 1[minus]x]Ce[sub x]O[sub 2] solid solutions
Zirconia-ceria solid solution synthesis and the temperature-time-transformation diagram for the 1:1 composition