The Gd-Ba-Cu-O system: Phase relationships at ∼950°C in air
| Autor: | J. Czerwonka, Harry A. Eick, W. Lasocha, S.A. Hodorowicz, E. Hodorowicz, A. Chodorowicz-Bak |
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| Rok vydání: | 1991 |
| Předmět: |
Absorption spectroscopy
Chemistry Inorganic chemistry Analytical chemistry Crystal structure Atmospheric temperature range Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry X-ray crystallography Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Solubility Powder diffraction Solid solution Phase diagram |
| Zdroj: | Journal of Solid State Chemistry. 92:480-488 |
| ISSN: | 0022-4596 |
| Popis: | A systematic X-ray powder diffraction study of the Gd 2 O 3 -BaCO 3 -CuO system over the temperature range 920-980°C in ambient air is presented as a function of cation composition. In the pseudobinary regions the phases BaGd 2 O 4 , “Gd 2 Ba 4 O 7 ,” Gd 2 CuO 4 , and BaCuO 2 were observed. Mass balance data suggest that “Gd 2 Ba 4 O 7 ” is actually Gd 2 Ba 4 O 7 · CO 2 . In the pseudoternary region the phases Gd 2 BaCuO 5 , GdBa 3 Cu 2 O y , and GdBa 2 Cu 3 O 6.5+ x were identified. Although GdBa 2 Cu 3 O 6.5+ x exhibited minimal solid solution, GdBa 3 Cu 2 O y evidenced a significant solubility range. Lattice parameters are presented and from a phase analysis subsolidus relationships are constructed. The system is compared with related systems. |
| Databáze: | OpenAIRE |
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