Synthesis, structure, and properties of LaSr{sub 3}Fe{sub -x}Ga{sub x}O{sub 10-{delta}}: An intermediate Fe{sup 3+} spin state
Journal Article
·
· Journal of Solid State Chemistry
- Univ. of Texas, Austin, TX (United States)
The solid solubility of Ga in this solid solution extends to x=2. A phase change occurs near the composition x = 1 from tetragonal to orthohombic. A Rietveld X-ray powder diffraction structure determination of LaSr{sub 3}FeGa{sub 2}O{sub 9} indicates that Fe occupies the central octahedral interstice in the triple octahedral layer. Oxygen vacancies are present in the equatorial positions of the central octahedron and in the bridging oxygen positions. The phase change is driven by the increase of the c/a ratio of the tetragonal phase. The phases are antiferromagnets with Neel temperatures of 45 K for the tetragonal phases that go to zero for the orthorhombic phase. The effective magnetic moment for the tetragonal phase is 6 {mu}{sub B} for high spin Fe{sup 3+}. An intermediate spin state of 4 {mu}{sub B} is observed for the orthorhombic phase indicative of three unpaired electrons.
- OSTI ID:
- 269891
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 122; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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