Transport critical currents in spray pyrolyzed films of TlBa2Ca2Cu3O<i>z</i> on polycrystalline zirconia substrates

Tkaczyk, J. E.; DeLuca, J. A.; Karas, P. L.; Bednarczyk, P. J.; Garbauskas, M. F.; Arendt, R. H.; Lay, K. W.; Moodera, J. S.

doi:10.1063/1.107852

Cited by 79 publications

(9 citation statements)

References 29 publications

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“…In a first step a polycrystalline ͑Tl͒BaCaCuO precursor film, either thallium free or containing thallium, was deposited by several methods such as sputtering, 2 laser ablation, [3][4][5] or spray pyrolysis. 6 In a second step thallium was introduced into the precursor film by a heat treatment in the presence of O 2 and Tl 2 O vapor for forming of the Tl-1223 phase. It has been found that a platelike structure developed during the heat treatment, with grain boundaries, and weak links that are responsible for low values of the critical current density.…”

Section: ͓S0003-6951͑96͒02807-2͔mentioning

confidence: 99%

In situ preparation of epitaxial TlBa2Ca2Cu3O9 high-T c thin films

Reschauer

Spreitzer

Brozio

et al. 1996

Applied Physics Letters

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We report an in situ growth of epitaxial TlBa2Ca2Cu3O9 high-Tc thin films. The films (thickness 80–400 nm) were prepared on LaAlO3 (100) substrates by laser ablation from a thallium-free BaCaCuO target in the presence of Tl2O vapor. X-ray diffraction patterns of θ–2θ scans showed that the films consisted of highly oriented TlBa2Ca2Cu3O9 with the c axis perpendicular to the substrate surface, and φ scan measurements indicated epitaxial growth. Scanning electron microscope and atomic force microscope investigations showed smooth surfaces without platelike structures. The films had transition temperatures near 100 K.

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Section: ͓S0003-6951͑96͒02807-2͔mentioning

confidence: 99%

In situ preparation of epitaxial TlBa2Ca2Cu3O9 high-T c thin films

Reschauer

Spreitzer

Brozio

et al. 1996

Applied Physics Letters

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“…Superconductor tapes of silver-sheathed (Tl,Pb)(Sr,Ba) 2 Ca 2 Cu 3 O y have been investigated by Ren et al [26, 27], and Salazar et al [28]. The processing of 1223 into wire and tape has been achieved by several alternative methods, including electrophoresis [29], powder in tube [28], and a two-step process including thallination of tape precursors [30]. Silver has been favored as a foundation for the wire or tape, largely because of its promotion in 1223 grain alignment, and the resulting improvement in superconducting properties.…”

Section: Introductionmentioning

confidence: 99%

Melting and vaporization of the 1223 phase in the system (Tl-Pb-Ba-Sr-Ca-Cu-O)

Cook

Wong‐Ng

Paranthaman

1996

J. Res. Natl. Inst. Stand. Technol.

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The melting and vaporization of the 1223 [(Tl,Pb):(Ba,Sr):Ca:Cu] oxide phase in the system (Tl-Pb-Ba-Sr-Ca-Cu-O) have been investigated using a combination of dynamic methods (differential thermal analysis, thermogravimetry, effusion) and post-quenching characterization techniques (powder x-ray diffraction, scanning electron microscopy, energy dispersive x-ray spectrometry). Vaporization rates, thermal events, and melt compositions were followed as a function of thallia loss from a 1223 stoichiometry. Melting and vaporization equilibria of the 1223 phase are complex, with as many as seven phases participating simultaneously. At a total pressure of 0.1 MPa the 1223 phase was found to melt completely at (980 ± 5) °C in oxygen, at a thallia partial pressure (pTl2O) of (4.6 ± 0.5) kPa, where the quoted uncertainties are standard uncertainties, i.e., 1 estimated standard deviation. The melting reaction involves five other solids and a liquid, nominally as follows: 1223→1212+(Ca,Sr)2CuO3+(Sr,Ca)CuO2+BaPbO3+(Ca,Sr)O+LiquidStoichiometries of the participating phases have been determined from microchemical analysis, and substantial elemental substitution on the 1212 and 1223 crystallographic sites is indicated. The 1223 phase occurs in equilibrium with liquids from its melting point down to at least 935 °C. The composition of the lowest melting liquid detected for the bulk compositions of this study has been measured using microchemical analysis. Applications to the processing of superconducting wires and tapes are discussed.

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“…Particularly, using the traditional two-step method, a coexistent TlBa 2 CaCu 2 O 7 (Tl-1212) or Tl 2 Ba 2 CaCu 2 O 8 (Tl-2212) phase often emerges in Tl-1223 films, which degrades the Tl-1223 film properties. [7,8] To overcome the above challenge, many strategies have been proposed to improve the purity of Tl-1223. For example, by partial substitution of Tl atoms with Bi or Pb and replacing most Ba atoms with Sr, the ratio of the Tl-1212 or Tl-2212 phase in entire Tl-1223 phase crystal can be reduced.…”

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confidence: 99%

Growth of TlBa₂Ca₂Cu₃O₉ Epitaxial Thin Films by Two-Step Method in Argon*

Xing

Wang²,

Gao

et al. 2019

Chinese Phys. Lett.

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TlBa2Ca2Cu3O9 (Tl-1223) films have promising applications due to their high critical temperature and strong magnetic flux pinning. Nevertheless, the preparation of pure phase Tl-1223 film is still a challenge. We successfully fabricate Tl-1223 thin films on LaAlO3 (001) substrates using dc magnetic sputtering and a post annealing two-step method in argon atmosphere. The crystallization temperature of Tl-1223 films in argon is reduced by 100°C compared to that in oxygen. This greatly reduces the volatilization of Tl and improves the surface morphology of films. The lower annealing temperature can effectively improve the repeatability of the Tl-1223 film preparation. In addition, pure Tl-1223 phase can be obtained in a broad temperature zone, from 790°C to 830°C. In our study, the films show homogenous and dense surface morphology using the presented method. The best critical temperature of Tl-1223 films is characterized to be 110 K, and the critical current J c (77 K, 0 T) is up to 2.13 × 106 A/cm2.

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Transport critical currents in spray pyrolyzed films of TlBa2Ca2Cu3Oz on polycrystalline zirconia substrates

Cited by 79 publications

References 29 publications

In situ preparation of epitaxial TlBa2Ca2Cu3O9 high-T c thin films

In situ preparation of epitaxial TlBa2Ca2Cu3O9 high-T c thin films

Melting and vaporization of the 1223 phase in the system (Tl-Pb-Ba-Sr-Ca-Cu-O)

Growth of TlBa₂Ca₂Cu₃O₉ Epitaxial Thin Films by Two-Step Method in Argon*

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Transport critical currents in spray pyrolyzed films of TlBa2Ca2Cu3Oz on polycrystalline zirconia substrates

Cited by 79 publications

References 29 publications

In situ preparation of epitaxial TlBa2Ca2Cu3O9 high-T c thin films

In situ preparation of epitaxial TlBa2Ca2Cu3O9 high-T c thin films

Melting and vaporization of the 1223 phase in the system (Tl-Pb-Ba-Sr-Ca-Cu-O)

Growth of TlBa2Ca2Cu3O9 Epitaxial Thin Films by Two-Step Method in Argon*

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Growth of TlBa₂Ca₂Cu₃O₉ Epitaxial Thin Films by Two-Step Method in Argon*