Determination of the structure of the cubic phase in high-ZrO{sub 2}Y{sub 2}O{sub 2}-ZrO{sub 2} alloys by CBED
- Case Western Reserve Univ., Cleveland, OH (United States)
Convergent beam electron diffraction (CBED) was used to determine the space group of 9.9 and 18 mol% Y{sub 2}O{sub 3}-stabilized cubic ZrO{sub 2} (Y-CSZ) single crystals. The result (P43m space group) is different from the known tetragonal structure (P4{sub 2}/nmc space group) present in lower solute (3.2 mol% Y{sub 2}O{sub 3}) alloys, and the cubic structure (space group Fm3m) traditionally assumed for cubic ZrO{sub 2}. The oxygen sublattice of the cubic structure is distorted from Fm3m, relative to the cation sublattice, by displacements along the <111> directions. Computer simulations of the CBED patterns agree with experiment and suggest an anion displacement of {approximately}0.3 {Angstrom} from the (1/4,1/4,1/4) positions of the ideal fluorite structure.
- Research Organization:
- Los Alamos National Lab., NM (United States); Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering
- OSTI ID:
- 443384
- Report Number(s):
- LA-SUB--94-69; ON: DE97002581
- Country of Publication:
- United States
- Language:
- English
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