Abstract
The perovskite-type solid solutions Sr2(Sr1-xMx)TaOz(M=Ca, Nd) were synthesized. Lattice distortion and cation ordering in the octahedral site of the perovskite type structure were investigated using Rietveld analysis of powder X-ray diffraction data. Cubic perovskite-type phases with cation ordering in octahedral site were obtained for Sr2(Sr1-xCax)TaO5.5 (x=0-1), and Sr2(Sr0.9Nd0.1)TaO5.55. Two types of monoclinic perovskite-type phases were obtained for Sr2(Sr1-xNd0.1)TaOz. The unit cell of the solid solutions for :c=0.30.7 was close to a tetragonal cell. The distortion of the solid solutions was due to tilting octahedra and a difference in the direction of tilt was observed between the compounds for x=0.3-0.7 and x=0.9-1.0. Degree of monoclinic distortion increased with increasing Nd3+ content. Cation ordering in the octahedral sites was observed in all the compositions investigated for Sr2(Sr1-xNdx)TaOz. Increase of Nd3+ content possibly causes increase of oxygen content z. The present results suggest that increase of oxygen content is one of the reasons to cause the lattice distortion for Sr2(Sr1-xMx)TaOz(M=Ca, Nd).
| Original language | English |
|---|---|
| Pages (from-to) | 633-638 |
| Number of pages | 6 |
| Journal | Journal of the Ceramic Society of Japan |
| Volume | 107 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1999 |
Keywords
- Lattice distortion
- Oxygen defect
- Perovskite
- Tolerance factor
ASJC Scopus subject areas
- Ceramics and Composites
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry