Differences between the forming processes of RBa{sub 2}Cu{sub 3}O{sub 7-x}(R = Y, Yb) phases and preparation of the single-phase Yb-123 superconductor

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1994.1325· OSTI ID:508699

Du, Y K; Che, G C; Jia, S L; Zhao, Z X ^[1]

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1. Institute of Physics, Beijing (China)

The formation of YBa{sub 2}Cu{sub 3}O{sub 7-x} (Yb-123) and YbBa{sub 2}Cu{sub 3}O{sub 7-x} (Yb-123) phases, the synthesis of single-phase Yb-123, and the lowest temperature for obtaining the single-phase Y-123 superconductor have been studied by X-ray diffraction, differential thermal analysis, and superconductivity measurements. The results indicate that the Y-123 phase is formed from the principal chemical reaction Y{sub 2}O{sub 3} + 4BaCO{sub 3} + 6CuO + (1 - 2x)/2O{sub 2} {r_arrow} 2YBa{sub 2}Cu{sub 3}O{sub 7-x} + 4CO{sub 2}{up_arrow}. The reactions for forming Yb-123 phase are Yb{sub 2}O{sub 3} + BaCO{sub 3} + CuO {r_arrow} Yb{sub 2}BaCuO{sub 5} + CO{sub 2} {up_arrow} BaCO{sub 3} + CuO {r_arrow} BaCuO{sub 2} + CO{sub 2} {up_arrow} Yb{sub 2}BaCuO{sub 5} + 3BaCuO{sub 2} + 2CuO + (1 - 2x)/2O{sub 2} {r_arrow} 2YbBa{sub 2}Cu{sub 3}O{sub 7-x}. In our experiments, the lowest temperature for obtaining the near-single-phase Y-123 bulk superconductor is 780{degrees}C; a simple procedure for synthesis of the single-phase Yb-123 superconductor is described.

• OSTI ID: 508699
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 112; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CHEMICAL PREPARATION
CUPRATES
DIFFERENTIAL THERMAL ANALYSIS
HIGH-TC SUPERCONDUCTORS
STOICHIOMETRY
SUPERCONDUCTIVITY
SYNTHESIS
X-RAY DIFFRACTION
YTTERBIUM COMPOUNDS
YTTRIUM COMPOUNDS