Process for Preparing Superconducting Film Having Substantially Uniform Phase Development PDF Download
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Languages : en
Pages : 0
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Languages : en
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Languages : en
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A process for preparing a superconducting film, such as a thallium-barium-calcium-copper oxide superconducting film, having substantially uniform phase development. The process comprises providing an electrodeposition bath having one or more soluble salts of one or more respective potentially superconducting metals in respective amounts adequate to yield a superconducting film upon subsequent appropriate treatment. Should all of the metals required for producing a superconducting film not be made available in the bath, such metals can be a part of the ambient during a subsequent annealing process. A soluble silver salt in an amount between about 0.1% and about 4.0% by weight of the provided other salts is also provided to the bath, and the bath is electrically energized to thereby form a plated film. The film is annealed in ambient conditions suitable to cause formation of a superconductor film. Doping with silver reduces the temperature at which the liquid phase appears during the annealing step, initiates a liquid phase throughout the entire volume of deposited material, and influences the nucleation and growth of the deposited material.
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Category : Patents
Languages : en
Pages : 964
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Category : Patents
Languages : en
Pages : 2192
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Author: Hari Singh Nalwa
Publisher: Elsevier
ISBN: 0080533248
Category : Technology & Engineering
Languages : en
Pages : 3436
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This five-volume handbook focuses on processing techniques, characterization methods, and physical properties of thin films (thin layers of insulating, conducting, or semiconductor material). The editor has composed five separate, thematic volumes on thin films of metals, semimetals, glasses, ceramics, alloys, organics, diamonds, graphites, porous materials, noncrystalline solids, supramolecules, polymers, copolymers, biopolymers, composites, blends, activated carbons, intermetallics, chalcogenides, dyes, pigments, nanostructured materials, biomaterials, inorganic/polymer composites, organoceramics, metallocenes, disordered systems, liquid crystals, quasicrystals, and layered structures.Thin films is a field of the utmost importance in today's materials science, electrical engineering and applied solid state physics; with both research and industrial applications in microelectronics, computer manufacturing, and physical devices.Advanced, high-performance computers, high-definition TV, digital camcorders, sensitive broadband imaging systems, flat-panel displays, robotic systems, and medical electronics and diagnostics are but a few examples of miniaturized device technologies that depend the utilization of thin film materials. The Handbook of Thin Films Materials is a comprehensive reference focusing on processing techniques, characterization methods, and physical properties of these thin film materials.
Author: Peir-Yung Chu
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Languages : en
Pages :
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Superconducting $rm YBasb2Cusb3Osb{7-x}$ thin films, 0.1-1.5 $mu$m thick, were prepared from carboxylate precursors by reactive liquid phase sintering. Processing effects on phase development, microstructure evolution, and important film properties, such as transition temperature, critical current density, and weak-link behavior, were investigated. The precursor trimethylacetate salts were dissolved in propionic acid/amylamine mixed solvent system, resulting in stable solutions suitable for coatings. Thin films were deposited onto LaAlO$sb3$ single crystal substrates by spin-coating and were fired at 740-950$spcirc$C under O$sb2$, N$sb2$, or mixed $rm Nsb2/Osb2$ atmosphere. The phase formation map for BaO-CuO binary compound was constructed for the films processed in flowing N$sb2$ atmosphere, showing liquid phase formation at 640$spcirc$C. Molecular level mixing in the precursor solution and processing under flowing N$sb2$ were the two contributing factors for this low temperature liquid phase formation. The use of N$sb2$ atmosphere also facilitated the decomposition of BaCO$sb3$ and the formation of the 123 phase. A two-step firing program was developed to optimize the processing based on the reactive liquid phase sintering. The films were first fired at 800$spcirc$C/40 min in N$sb2$ for crystallization and grain growth, and then at 920$spcirc$C/10 min in a low P$sb{{rm O}sb2}$ atmosphere (P$sb{{rm N}sb2}$/P$sb{{rm O}sb2}$ = 100) for densification and orientation by capillary forces. Based on the experimental results and observations, reaction mechanisms and densification models were developed for the reactive liquid phase sintering process. The films prepared by reactive liquid phase sintering showed essential epitaxial growth and excellent preferred orientation with T$sb{rm c(zero)}$ = 87.8 K and $rm Jsb{c} > 10sp5$ A/cm$sp2$ at 77 K. Due to capillary action, any residual liquid phase or second phase materials were extruded from grains and located on the film surface, resulting in clean grain boundaries. SIMS analysis indicated uniform cation concentration profile throughout the films and insignificant film/substrate interdiffusions. Major findings in this work include: (1) successful development in the solution chemistry for thin film fabrication based on trimethylacetate precursors, (2) construction of phase formation map, showing low temperature liquid phase formation in N$sb2$ during the processing of the 123 films, and (3) development of a new operative reactive liquid phase sintering mechanism to prepare high quality 123 thin films in controlled atmosphere.
Author: T. Venkatesan
Publisher:
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Category : Technology & Engineering
Languages : en
Pages : 382
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Author: Gianfranco Pacchioni
Publisher: John Wiley & Sons
ISBN: 3527640193
Category : Technology & Engineering
Languages : en
Pages : 368
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A wealth of information in one accessible book. Written by international experts from multidisciplinary fields, this in-depth exploration of oxide ultrathin films covers all aspects of these systems, starting with preparation and characterization, and going on to geometrical and electronic structure, as well as applications in current and future systems and devices. From the Contents: Synthesis and Preparation of Oxide Ultrathin Films Characterization Tools of Oxide Ultrathin Films Ordered Oxide Nanostructures on Metal Surfaces Unusual Properties of Oxides and Other Insulators in the Ultrathin Limit Silica and High-K Dielectrics Thin Films in Microelectronics Oxide Passive Films and Corrosion Protection Oxide Films as Catalytic Materials and as Models of Real Catalysts Oxide Films in Spintronics Oxide Ultrathin Films in Solid Oxide Fuel Cells Transparent Conducting and Chromogenic Oxide Films as Solar Energy Materials Oxide Ultrathin Films in Sensor Applications Ferroelectricity in Ultrathin Film Capacitors Titania Thin Films in Biocompatible Materials and Medical Implants Oxide Nanowires for New Chemical Sensor Devices
Author: R.W. Fast
Publisher: Springer Science & Business Media
ISBN: 1461398800
Category : Technology & Engineering
Languages : en
Pages : 759
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Book Description
Papers by leading engineers and scientists in the field report the latest advances in low temperature materials science and technology and set priorities for new research. The topics covered include general superconductor theory, measurement, and processing; low temperature superconductors; high tem
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Category : Aeronautics
Languages : en
Pages : 376
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
