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

I. Nedkov, A. Veneva

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14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)6726-6728
Number of pages3
JournalJournal of Applied Physics
Volume75
Issue number10
DOIs
Publication statusPublished - 1994 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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