Alkali metals impurities influence on the magnetic and electrical properties of YBCO

I. Nedkov; A. Veneva

doi:10.1063/1.356850

Alkali metals impurities influence on the magnetic and electrical properties of YBCO

I. Nedkov, A. Veneva

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The samples were prepared using the primary batch formula Y _1-0.2xBa_2-0.2xCu_3+0.3x(Me)_0.4xO _y, where x=0-1.20 and Me denotes alkali metals (Na, K, Rb) introduced as carbonates. The presence of alkali carbonates during the process allows one to influence the YBCO grain size and improve the homogeneity of the structure. Despite the large concentration range of additives in the initial batch after the second treatment at temperatures higher than 900°C, only traces of the alkali metals were revealed. The influence of Na, K, and Rb impurities in concentrations for Na about 5×10^-1 wt %; for K to 4×10^-2 wt %, and Rb to 2×10^-2 wt % in polycrystalline YBCO was investigated. For Rb and K, the R(T) transitions were comparable to that of pure YBCO. The microwave surface resistance R_s was least influenced by the impurities, but strongly depended on the polycrystalline microstructure. Each impurity had a specific effect on χ(T) and J_c which are related to the grain-boundary structure.

Original language	English
Pages (from-to)	6726-6728
Number of pages	3
Journal	Journal of Applied Physics
Volume	75
Issue number	10
DOIs	https://doi.org/10.1063/1.356850
Publication status	Published - 1994 Dec 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Alkali metals impurities influence on the magnetic and electrical properties of YBCO",

abstract = "The samples were prepared using the primary batch formula Y 1-0.2xBa2-0.2xCu3+0.3x(Me)0.4xO y, where x=0-1.20 and Me denotes alkali metals (Na, K, Rb) introduced as carbonates. The presence of alkali carbonates during the process allows one to influence the YBCO grain size and improve the homogeneity of the structure. Despite the large concentration range of additives in the initial batch after the second treatment at temperatures higher than 900°C, only traces of the alkali metals were revealed. The influence of Na, K, and Rb impurities in concentrations for Na about 5×10-1 wt %; for K to 4×10-2 wt %, and Rb to 2×10-2 wt % in polycrystalline YBCO was investigated. For Rb and K, the R(T) transitions were comparable to that of pure YBCO. The microwave surface resistance Rs was least influenced by the impurities, but strongly depended on the polycrystalline microstructure. Each impurity had a specific effect on χ(T) and Jc which are related to the grain-boundary structure.",

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AU - Nedkov, I.

AU - Veneva, A.

PY - 1994/12/1

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N2 - The samples were prepared using the primary batch formula Y 1-0.2xBa2-0.2xCu3+0.3x(Me)0.4xO y, where x=0-1.20 and Me denotes alkali metals (Na, K, Rb) introduced as carbonates. The presence of alkali carbonates during the process allows one to influence the YBCO grain size and improve the homogeneity of the structure. Despite the large concentration range of additives in the initial batch after the second treatment at temperatures higher than 900°C, only traces of the alkali metals were revealed. The influence of Na, K, and Rb impurities in concentrations for Na about 5×10-1 wt %; for K to 4×10-2 wt %, and Rb to 2×10-2 wt % in polycrystalline YBCO was investigated. For Rb and K, the R(T) transitions were comparable to that of pure YBCO. The microwave surface resistance Rs was least influenced by the impurities, but strongly depended on the polycrystalline microstructure. Each impurity had a specific effect on χ(T) and Jc which are related to the grain-boundary structure.

AB - The samples were prepared using the primary batch formula Y 1-0.2xBa2-0.2xCu3+0.3x(Me)0.4xO y, where x=0-1.20 and Me denotes alkali metals (Na, K, Rb) introduced as carbonates. The presence of alkali carbonates during the process allows one to influence the YBCO grain size and improve the homogeneity of the structure. Despite the large concentration range of additives in the initial batch after the second treatment at temperatures higher than 900°C, only traces of the alkali metals were revealed. The influence of Na, K, and Rb impurities in concentrations for Na about 5×10-1 wt %; for K to 4×10-2 wt %, and Rb to 2×10-2 wt % in polycrystalline YBCO was investigated. For Rb and K, the R(T) transitions were comparable to that of pure YBCO. The microwave surface resistance Rs was least influenced by the impurities, but strongly depended on the polycrystalline microstructure. Each impurity had a specific effect on χ(T) and Jc which are related to the grain-boundary structure.

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