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  • 1
    Electronic Resource
    Electronic Resource
    Tl-Ba-Ca-Cu-O superconducting thin films with postdeposition processing using Tl-containing thin films as Tl source : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6495-6497 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a new method of processing Tl-Ba-Ca-Cu-O (TBCCO) superconducting thin films. In this method, two identical elemental multilayer films containing Tl layers were prepared using an electron-beam deposition technique. The thin-film samples were then placed in face-to-face contact in a quartz crucible and heat treated at 740 °C for 10 min in flowing air. The x-ray microanalysis of the bottom sample indicates promising results for obtaining the desired chemical composition. Random characterization from different sections of the sample showed that the microanalysis values had less scatter than those for samples prepared using the usual bulk postdeposition method. The average chemical composition of the 13 points obtained from the random section is Tl1.8Ba1.8Ca1.9Cu2.0Ox. However, oxygen analysis showed that the concentration of oxygen is low and poorly distributed, presumeably attributable to the low oxygen flow. This method has several advantages over the conventional Tl-O vapor processing using pure metallic thallium, thallium oxide or bulk TBCCO. These advantages include: (a) increase in uniformity of thallium deposition, (b) safer processing as a result of a smaller release of thallium, and (c) reduction of processing cost.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349886
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of oriented high-Tc Tl-Ca-Ba-Cu-O thin films from co-condensed amorphous Ca-Ba-Cu alloys by post-deposition oxidation and Tl diffusion (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1399-1401 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-phase Tl2Ca1Ba2Cu2O8 thin films with zero-resistance transition temperature up to 100 K have been prepared on single-crystal MgO substrates from codeposited Ca-Ba-Cu amorphous metallic alloy precursors. After thermal oxidation of the metallic alloy film, Tl from Tl2O3 was vapor deposited and diffused into the resulting mixed metal oxide during a rapid high-temperature anneal. The films prepared in this process are highly oriented with the c axis normal to the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346697
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  • 3
    Electronic Resource
    Electronic Resource
    Formation of CuInSe2 thin films by rapid thermal recrystallization (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2678-2680 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline thin-film CuInSe2 has been formed by rapid thermal processing of vacuum codeposited Cu, In, and Se. Films were fabricated and characterized in three composition regions: Cu-poor (∼20 at. % Cu), stoichiometric (25 at. %), and Cu-rich (∼28 at. %). Characterization results are presented including x-ray diffraction analysis, electron probe for microanalysis, scanning electron microscopy, and optical reflection and transmission measurements. Results show that nearly single-phase material has been formed from codeposited precursors with a post-deposition annealing time of less than 2 min. The films have optical absorption coefficients in the high 104 cm−1 range with minimum subgap absorption, and an optical band gap of 1.0 eV with smooth morphologies amenable to photovoltaic device fabrication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104805
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  • 4
    Electronic Resource
    Electronic Resource
    Significantly enhanced flux pinning in the Bi-substituted TlBa2Ca2Cu3Oy system (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2370-2372 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found that substitution of bismuth into the TlBa2Ca2Cu3O9 system leads to a high temperature superconductor with significantly greater low temperature flux pinning than that of the other copper oxide superconductors. Bi substitutes at the Tl site up to 20 at. %. The superconducting transition temperature Tc increases from 110 K for x=0.0 to 116 K for x=0.2. Scanning electron microscope (SEM) images reveal a platelike morphology which is highly suitable for powder-in-tube processing. The magnetization–hysteresis loop shows that the Bi-substituted phase has significantly better low temperature flux pinning properties than the pristine Tl cuprate, and exhibits only a weak dependence on temperature and field when compared to that of unsubstituted phase. However, at 77 K the compound has lower Jc, determined magnetically, compared to that of the (Tl,Pb,Bi)Sr1.6Ba0.4Ca2Cu3Oy and Y-123 systems. The enhancement of superconducting properties is attributed to an increased coupling between the CuO2 planes along the c axis. Substitution of 20% of Bi in TlBa2Ca2Cu3O9 makes the compound an excellent choice for magnet wire applications at relatively low temperatures. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120030
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  • 5
    Electronic Resource
    Electronic Resource
    Tl2O3 vapor process of making Tl-Ba-Ca-Cu-O superconductors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2686-2688 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new process for making Tl-Ba-Ca-Cu-O superconductors which is based on reactions between solid precursor Ba-Ca-Cu-oxides and vapor Tl2O3 has been developed. The Tl2O3 vapor process allows Tl-Ba-Ca-Cu-O superconductors to be easily made in the forms of complex bulk components, wires and fibers, and thick and thin films, and minimizes problems caused by toxicity and volatility of Tl starting compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100670
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation of high Tc Tl-Ba-Ca-Cu-O thin films by pulsed laser evaporation and Tl2O3 vapor processing (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1810-1811 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tl-Ba-Ca-Cu-O superconducting thin films with zero-resistance temperatures up to 115 K have been prepared using a Tl2 O3 vapor process on Ba-Ca-Cu-O precursor thin films. The Ba-Ca-Cu-O thin films were made by laser deposition on Y-stabilized ZrO2 substrates. This technique minimizes problems caused by the toxicity of Tl2 O3, and its subsequent decomposition to the volatile and toxic Tl2 O upon heating. Therefore, it may have practical application in the fabrication of high Tc Tl-Ba-Ca-Cu-O superconducting thin-film devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101493
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  • 7
    Electronic Resource
    Electronic Resource
    Levitation effects involving high Tc thallium based superconductors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1119-1121 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thallium based superconductor Tl2Ca2Ba2Cu3O10+y has been shown to exhibit very stable and unusual levitation equilibria in various arrangements involving this material and permanent magnets. Attractive and repulsive forces are evident in experiments in which samples are levitated above and below magnets. Photographs of these experiments and approximate quantitative discussions of the results are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100660
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  • 8
    Electronic Resource
    Electronic Resource
    New 120 K Tl-Ca-Ba-Cu-O superconductor (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1738-1740 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electronic and magnetic properties of the new 120 K Tl-Ca-Ba-Cu-O superconductor are presented. Resistance-temperature variations, ac susceptibility, and the (low) magnetic field dependence of the critical current density are reported. The new superconductor can be prepared in a molten state, which should allow processing leading to high critical current density. Preliminary x-ray diffraction data are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99717
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  • 9
    Electronic Resource
    Electronic Resource
    Melt-processible rare earth-Ba-Cu-O superconductors based on molten Ba-Cu oxides (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1854-1856 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ba-Cu oxides with certain compositions were found to be meltable or partly meltable at a relatively low temperature of 950 °C. High-quality, dense, and void-free high-temperature superconductors based on rare earth(RE)-Ba-Cu oxides of the form REBa2Cu3O6.5+x have been made by reactions between molten Ba-Cu oxides and solid RE-containing materials at the same temperature. This has allowed superconductive components to be made in a wide variety of shapes. This melt process will significantly alter oxide superconductor preparation procedures, and will allow growth of large single crystals aiding in the understanding of the mechanism of superconductivity and in the search for superconductivity at even higher transition temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98492
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  • 10
    Electronic Resource
    Electronic Resource
    Structural and elemental analysis of melt-processible high-temperature superconductors by surface science and x-ray diffraction measurements (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5056-5060 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the results of scanning electron microscopy (SEM), microprobe analysis (wavelength dispersive and energy dispersive spectroscopies), secondary-ion mass spectroscopy (SIMS), and x-ray diffraction measurements on a series of melt-processed high critical-temperature superconductors. The superconductors were synthesized through a melt reaction between TbBa2Cu3O7−x and nonstoichiometric rare-earth Ba-Cu-O oxides. The melt-processed samples are dense, largely void-free superconductors with critical temperatures in the 90–95 K range. Microprobe and SIMS data show the absence of Tb in surfaces of the interiors of samples which had been fractured to expose the interior regions. Comparative microprobe and SEM data are included for conventionally prepared sintered samples. Comparative x-ray diffraction studies are presented which show that the melt-processed samples studied have diffraction patterns nearly identical to those of sintered (rare earth)Ba2Cu3O7−x samples. In two of the three Y-based melt-processed superconductors studied, the compound stoichiometry from microprobe analysis is Y1Ba2Cu3O7−x. The evidence presented indicates that the TbBa2Cu3O7−x decomposes during the melt reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342460
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