Structure and properties of Ba{sub 6{minus}x}Ln{sub x}Nb{sub 10}O{sub 30}, Ln = La, Ce and Nd compounds
Journal Article
·
· Materials Research Bulletin
- Moscow State Univ. (Russian Federation). Dept. of Chemistry
- Stockholm Univ. (Sweden). Arrhenius Lab.
- Royal Inst. of Tech., Stockholm (Sweden). Dept. of Solid State Physics
Ba{sub 6{minus}x}Ln{sub x}Nb{sub 10}O{sub 30} compounds, Ln = La, Ce and Nd, with a tetragonal tungsten bronze-type structure have been synthesized and were characterized by X-ray powder diffraction and EDS analysis. The homogeneity regions of the obtained compounds were found to be 0 {le} x {le} 2 for La, and 0 {le} x {le} 1.5 for Ce and Nd. The crystal structures of Ba{sub 5}LaNb{sub 10}O{sub 30} and Ba{sub 4}La{sub 2}Nb{sub 10}O{sub 30} were refined using X-ray powder diffraction data. Refinement indicated the presence of vacancies in the Ba/La positions. This observation was supported by oxidation studies of the La-substituted compounds. The temperature dependence of the normalized resistivity of the compounds showed a nonmetallic behavior. The increase in the R/R{sub 273} ratio with decreasing temperature is less distinct for the phases with the higher concentration of rare-earth cation.
- Sponsoring Organization:
- Goeran Gustafsson Foundation
- OSTI ID:
- 484864
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 32; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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