Tl-based superconducting films prepared by aerosol spray deposition and thallinated in an open system

• Autorzy: Zuzana Matkovičová , Vladimír Štrbík , Gustav Plesch , Michaela Valeriánová , Agáta Dujavová
• Języki publikacji: EN

Abstrakty

EN

Superconducting Tl-based films were prepared on a LaAlO3 single crystal substrate. Spray pyrolysis of Ba, Ca and Cu nitrate solutions was used for deposition of the precursor films. They were subsequently ex-situ thallinated in flowing oxygen (open system). While the superconducting Tl-2212 phase formed at an annealing temperature of 880°C, thallination at 900°C led to the formation of a Tl-2223 /Tl-2212 mixture. The amount of Tl-2223 increased with prolonged thallination, whereas the Tl-2212 phase progressively disappeared. Films prepared in such a manner were c-oriented and contained only low amounts of non-superconducting impurities. The resulting samples were characterized by XRD and SEM and their T C values were determined by resistive four-point measurements. They showed critical temperatures in the range of T ON = 125–135 K, T C0 = 91–93 K. Differences between the composition and properties of the obtained films and those thallinated in closed systems under 50 kPa of oxygen are discussed in this paper. Results show that the Tl-2212 → Tl-2223 transformation proceeds at a slower rate under flowing oxygen than in a closed system.

Słowa kluczowe

EN

Tl-based superconducting film; spray pyrolysis; Tl-2212; Tl-2223

• Czasopismo: Open Physics
• Rocznik: 2007
• Tom: 5
• Numer: 3
• Strony: 398-404

Daty

wydano

2007-09-01

online

2007-04-12

Twórcy

autor

Zuzana Matkovičová

• Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215, Bratislava, Slovakia

autor

Vladimír Štrbík

• Institute of Electrical Engineering, Slovak Academy of Science, SK-84104, Bratislava, Slovakia

autor

Gustav Plesch

• Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215, Bratislava, Slovakia,

autor

Michaela Valeriánová

• Institute of Electrical Engineering, Slovak Academy of Science, SK-84104, Bratislava, Slovakia

autor

Agáta Dujavová

Bibliografia

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Identyfikatory

DOI

10.2478/s11534-007-0015-8