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AbstractAbstract
[en] Electrochromic effects of WO/sub 3/ films have been extensively studied. In these electrochromic films, the injection of both I-group ions and electrons form a tungsten bronze (color center) structure (M/sub x/WO/sub 3/, x=0-1, M is H, Li, or Na). It is known that an intervalence electron transfer between W/sup +6/ and W/sup +5/ causes blue coloration in these films. Previously, the authors reported a new fabrication method and the properties of double-layered Li-W-O films. The WO/sub 3/ films exhibit photochromic effects as well as electrochromic effects. In this paper they describe the electrochromic effects of the double-layered Li-W-O films under UV light
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ALKALI METAL COMPOUNDS, ALLOYS, BEAM INJECTION, CHALCOGENIDES, COPPER ALLOYS, COPPER BASE ALLOYS, CRYSTAL DEFECTS, CRYSTAL STRUCTURE, ELECTROMAGNETIC RADIATION, FILMS, HYDROGEN COMPOUNDS, LITHIUM COMPOUNDS, OXIDES, OXYGEN COMPOUNDS, POINT DEFECTS, RADIATIONS, SODIUM COMPOUNDS, TIN ALLOYS, TRANSITION ELEMENT COMPOUNDS, TUNGSTEN COMPOUNDS, VACANCIES
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INIS VolumeINIS Volume
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Wasa, K.; Adachi, H.; Ichikawa, Y.; Setsune, K.; Hirochi, K.
Studies of high temperature superconductors1989
Studies of high temperature superconductors1989
AbstractAbstract
[en] Much attention has been paid for the thin films of perovskite-type oxides especially for the thin films of the high-Tc superconducting ceramics. Historically the thin films of the perovskite-type oxides have been studied as a basic research for ferroelectric materials. Thin films of BaTiO3 and PbTiO3 were tried to deposited and there ferroelectricity was evaluated. Recently this kind of perovskite thin films, including PZT (PbTiO3-PbZrO3) and PLZT [(Pb, La) (Zr, T)O3] have been studied in relation to the synthesis of thin film dielectrics, pyroelectrics, piezoelectrics, electro-optic materials, and acousto-optic materials. Thin films of BPB (BaPbO3- BaBiO3) were studied as oxide superconductors. At present the thin films of the rare-earth high-Tc superconductors of LSC (La1-xSrxCuO4) and YBC (YBa2Cu3O7-δ) have been successfully synthesized owing to the previous studies on the ferroelectric thin films of the perovskite- type oxides. Similar to the rare-earth high-Tc superconductors thin films of the rare-earth-free high-Tc superconductors of BSCC (Bi-Sr-Ca-Cu-O)9 and TBCC (Tl- Ba-Ca-Cu-O)10 system have been synthesized. In this section the basic processes for the fabrication of the high- Tc perovskite superconducting thin films are described
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Narlikar, A. (National Physical Lab., New Delhi (India)); Volume 1; 381 p; ISBN 0-941743-54-3; ; 1989; p. 182-210; Nova Science Publishers, Inc; Commack, NY (USA); Nova Science Publishers, Inc., 283 Commack Rd., Suite 300, New York, NY 11725 (USA)
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ALKALINE EARTH METAL COMPOUNDS, BARIUM COMPOUNDS, BISMUTH COMPOUNDS, CALCIUM COMPOUNDS, CHALCOGENIDES, COPPER COMPOUNDS, ELECTRIC CONDUCTIVITY, ELECTRICAL PROPERTIES, FILMS, LANTHANUM COMPOUNDS, LEAD COMPOUNDS, MINERALS, OXIDE MINERALS, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, RARE EARTH COMPOUNDS, STRONTIUM COMPOUNDS, THALLIUM COMPOUNDS, THERMODYNAMIC PROPERTIES, TITANIUM COMPOUNDS, TRANSITION ELEMENT COMPOUNDS, YTTRIUM COMPOUNDS, ZIRCONIUM COMPOUNDS
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AbstractAbstract
[en] Bi-Sr-Ca-Cu-O superconducting films were prepared by rf magnetron sputtering using a target with modulated composition and successive annealing in oxygen. The resistivity and Cu valence of the films varied before and after annealing. The zero-resistance temperature of the films was 10 K before the annealing, and rose up to 96 K (midpoint 105 K) after annealing. Essentially no change in the characteristic layer spacing (d value) of ≅18A, corresponding to c/2, was observed before and after the annealing as seen by x-ray diffraction. The Cu valence of the films was investigated by x-ray photoemission before and after annealing. The photoemission core-level spectra and LMM Auger emission spectra revealed that the Cu valence after annealing became larger than that obtained before annealing. The superconductivity obviously is correlated with the Cu valence of the films
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AbstractAbstract
[en] Electrical measurements were performed on polycrystalline thin films of the high T/sub c/ Bi-Sr-Ca-Cu-O system. The resistance of the superconducting state was confirmed to be smaller than 10/sup -8/ Ω cm at 100 K. It is confirmed directly that the critical current density at 77 K was in excess of 105 A/cm2 and the dependence of critical current on temperature was able to be represented approximately by (1-T/T/sub c/ )2
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Journal Article
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Numerical Data
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ALKALINE EARTH METAL COMPOUNDS, BISMUTH COMPOUNDS, CALCIUM COMPOUNDS, CHALCOGENIDES, COPPER COMPOUNDS, CURRENTS, DATA, ELECTRIC CURRENTS, ELECTRICAL PROPERTIES, FILMS, INFORMATION, NUMERICAL DATA, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, STRONTIUM COMPOUNDS, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENT COMPOUNDS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Wasa, K.; Adachi, H.; Hirochi, K.; Ichakawa, Y.; Setsune, K.
High-temperature superconductors: Fundamental properties and novel materials processing1990
High-temperature superconductors: Fundamental properties and novel materials processing1990
AbstractAbstract
[en] Basic thin film deposition processes for the high-Tc superconductors of Bi-systems are described. There appear several superconducting phases including the low-Tc phase Bi2Sr2Ca1Cu2Ox and the high-Tc phase Bi2Sr2Ca2Cu3Ox. Thin films with these superconducting phases are synthesized by a selection of the substrate temperature Ts during the deposition: the high-Tc phase with Tc = 80K, at Ts < 600 degrees C. However, these films often comprise show structure comprising the different superconducting phases. The close control of the superconducting phase has been achieved by the layer-by-layer deposition in the atomic layer epitaxy process
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Christen, D. (Oak Ridge National Lab., Oak Ridge, TN (United States)); Narayan, J. (North Carolina State Univ., Raleigh, NC (United States)); Schneemeyer, L. (AT and T Laboratories, Murray Hill, NJ (United States)); 1322 p; ISBN 1-55899-057-7; ; 1990; p. 537-544; Materials Research Society; Pittsburgh, PA (United States); Materials Research Society fall meeting; Boston, MA (United States); 27 Nov - 2 Dec 1989; CONF-891119--; Materials Research Society, 9800 McKnight Rd., Suite 327, Pittsburgh, PA 15237 (USA)
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Book
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AbstractAbstract
[en] Thin film fabrication has an important role to play as a means of clarifying the basic physical properties of high-temperature superconductors. For instance, when epitaxial film growth techniques are used, crystal axes are aligned far more easily than in the bulk state, facilitating the measurement of physical properties. It is the that superconducting materials so dense that they have a critical current as high as 107 A/cm2 can be fabricated. And, if high-temperature superconducting layers could be formed epitaxially on metals, semiconductors, insulators, and magnetic materials with a junction scale of order λGL and ξ, the method would be open for new types of superconducting devices. In this report, the authors describe thin superconducting films formed on a metal buffer layer
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AbstractAbstract
[en] Thin film processes for the high Tc superconductors of perovskite-type oxides are classified into three: (1) deposition at a low substrate temperature followed by a post-annealing at around 9000C; (2) deposition at a crystallization temperature 600--8000C, followed by the post-annealing; (3) deposition at the crystallization temperature under oxidizing atmosphere. The process (3) possibly lowers the synthesis temperature. It was confirmed that the superconducting thin films of Er-Ba-Cu-O were successfully grown at 6500C by the sputtering deposition owing to the process (3). Their onset temperature was 92K with zero-resistivity at 86K
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Thin film processing and characterization of high temperature superconductors; Anaheim, CA (USA); 6 Nov 1987; CONF-871178--
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Journal Article
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Conference
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ADSORPTION, AMORPHOUS STATE, ANNEALING, BARIUM COMPOUNDS, COPPER OXIDES, CRYSTAL STRUCTURE, ELECTRIC CONDUCTIVITY, ELECTRON DIFFRACTION, EPITAXY, ERBIUM COMPOUNDS, MAGNESIUM OXIDES, MONOCRYSTALS, POLYCRYSTALS, SAPPHIRE, SPUTTERING, STRONTIUM COMPOUNDS, SUPERCONDUCTING FILMS, SUPERCONDUCTIVITY, TEMPERATURE DEPENDENCE, TITANATES, YTTRIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS, CHALCOGENIDES, COHERENT SCATTERING, COPPER COMPOUNDS, CORUNDUM, CRYSTALS, DIFFRACTION, ELECTRICAL PROPERTIES, FILMS, HEAT TREATMENTS, MAGNESIUM COMPOUNDS, MINERALS, OXIDE MINERALS, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, RARE EARTH COMPOUNDS, SCATTERING, TITANIUM COMPOUNDS, TRANSITION ELEMENT COMPOUNDS
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AbstractAbstract
[en] The structure, bonding, and T/sub c/ of Bi-Sr-Ca-Cu-O superconducting films, prepared by rf magnetron sputtering, changed systematically upon varying the annealing conditions in oxygen. The spacing between the double Bi-O layers decreased from 22 to 18 A and the degree of c-axis orientation became higher with the annealing. No change in the Bi core-level electron spectra with the annealing was observed. The Cu core-level electron spectra indicated an increase of the Cu valence with the annealing. The core-level electron spectra of Sr and Ca showed the possibilities of random distribution of the Ca and Sr atoms between the double Bi-O layers prior to annealing and exchanging their lattice sites in the Bi2Sr2Ca2Cu3O/sub y/ crystal structure after annealing. The zero-resistance temperature of the films was 10 K before annealing, and rose up to 96 K (midpoint 105 K) after annealing. The annealing favors both oxidation of Cu and ordering of Sr and Ca atoms within the unit cell of the 2:2:2:3 crystal structure
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AbstractAbstract
[en] Excellent films of a high T/sub c/ oxide superconductor were easily produced on Pt-coated substrates at 650 0C. The film superconductivity was significantly improved by the Pt buffer layer. The c axis of the superconductive film was preferentially oriented perpendicularly to the plane with the crystalline oriented Pt coating layer
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Numerical Data
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BARIUM OXIDES, COPPER OXIDES, CRITICAL CURRENT, CRYSTAL STRUCTURE, ELECTRIC CONDUCTIVITY, ERBIUM OXIDES, EXPERIMENTAL DATA, FABRICATION, HIGH TEMPERATURE, LOW TEMPERATURE, MAGNESIUM OXIDES, MAGNETRONS, MICROSTRUCTURE, PLATINUM, SPUTTERING, SUPERCONDUCTING FILMS, SUPERCONDUCTIVITY, SURFACE COATING, THIN FILMS, TRANSITION TEMPERATURE, VAPOR DEPOSITED COATINGS, VERY LOW TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS, BARIUM COMPOUNDS, CHALCOGENIDES, COATINGS, COPPER COMPOUNDS, CURRENTS, DATA, DEPOSITION, ELECTRIC CURRENTS, ELECTRICAL PROPERTIES, ELECTRON TUBES, ELECTRONIC EQUIPMENT, ELEMENTS, EQUIPMENT, ERBIUM COMPOUNDS, FILMS, INFORMATION, MAGNESIUM COMPOUNDS, METALS, MICROWAVE EQUIPMENT, MICROWAVE TUBES, NUMERICAL DATA, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, PLATINUM METALS, RARE EARTH COMPOUNDS, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENT COMPOUNDS, TRANSITION ELEMENTS
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AbstractAbstract
[en] Thin films of the Tl-Ca-Ba-Cu-O system with 2-1-2-2 phase have been prepared stably on MgO substrates by rf magnetron sputtering and post-annealing. The post-annealing of the films was carefully carried out in order to reduce the effect of evaporation of Tl. The annealed films showed a c-axis-oriented structure perpendicular to the substrates. The highest zero-resistance temperature of the films was 102 K. The highest critical current density obtained so far was 1.2 x 105 A/cm2 at 77 K
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Numerical Data
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ALKALINE EARTH METAL COMPOUNDS, BARIUM COMPOUNDS, CALCIUM COMPOUNDS, CHALCOGENIDES, COATINGS, COPPER COMPOUNDS, DATA, FILMS, HEAT TREATMENTS, INFORMATION, MAGNESIUM COMPOUNDS, NUMERICAL DATA, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, THALLIUM COMPOUNDS, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENT COMPOUNDS
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