Phase transformation during low temperature Tl-diffusion in the fabrication of Tl-Ba-Ca-Cu-O thin films

Tang, Yongan; Sheng, Ζ. Z.; Luo, Weiang; Chan, I. N.; Chen, Z.Y.; Li, Y.F.; Pederson, Donald O.

doi:10.1016/0921-4534(93)90128-d

Cited by 11 publications

(2 citation statements)

References 17 publications

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“…Less surprisingly, no interaction has been observed between Tl(1223) thin films grown by in situ techniques and SrTiO 3 substrates [91,114] and this is attributed to the lower deposition temperatures (between 650 and 720 • C). The use of low-temperature thalliation anneals also appears to overcome the problem of chemical interaction between TBCCO thin films and SrTiO 3 substrates [117].…”

Section: Strontium Titanatementioning

confidence: 99%

Thallium-based HTS thin films, processing, properties and applications

Bramley¹,

O'connor²,

Grovenor³

1999

Supercond. Sci. Technol.

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Thin films of the Tl-based high-temperature superconducting (HTS) phases are beginning to find application in a number of practical devices, especially in the field of microwave communication systems. This review describes the issues surrounding the fabrication of thin films of the thallium-based HTS materials. The influence of thermodynamics and kinetics, the various potential thalliation techniques and the selection of an appropriate substrate material are all important considerations when designing a process for the fabrication of thin films of these highly reactive materials. The properties of the resulting films are critically dependent on the microstructures developed during thalliation. Microstructural evolution during thalliation, the effect of structural defects on the properties of such films and the importance of achieving biaxial grain alignment in optimizing the properties of the films are all discussed.

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Section: Strontium Titanatementioning

confidence: 99%

Thallium-based HTS thin films, processing, properties and applications

Bramley¹,

O'connor²,

Grovenor³

1999

Supercond. Sci. Technol.

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“…The advantage of using pellet Tl-sources lies in being able to keep pTl 2 O constant to a greater degree during sample sintering than in the case when either pure Tl 2 O 3 or Tl-based powder is applied. Recent success in the synthesis of Tl-1223 samples by pellet thallination was achieved by keeping the pTl 2 O during processing low enough either by optimizing the pellet composition [52] or by reducing accordingly the processing temperature [56].…”

Section: Single-zone Reaction Chambermentioning

confidence: 99%

Tl-based superconductors for high-current, high-field applications

Jergel

Conde-Gallardo

Falcony

et al. 1996

Supercond. Sci. Technol.

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We have reviewed the convenience and possibility of utilizing thallium-based HT c superconductors for power applications. Some basic properties of Tl-based systems such as the crystal structure, phase stability, weak-links, pinning problems and irreversibility lines are discussed first. Two basic approaches to conductor preparation are then described, the closed and the open one. Special attention is focused on the fabrication of Tl-1223 and Tl-2223 superconductors. In the case of the more successful open approach a two-step technological procedure is usually chosen: first, the basic precursor material without Tl is synthesized, then second, the precursor is thallinated in a one-or two-zone reaction chamber. The most important precursor preparation techniques are described including aerosol deposition from either solution or ink, electro-deposition, sol-gel methods such as spin-and dip-coating and screen-printing and painting. Finally, some properties of the produced conductors important for power applications are presented.

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