摘要:
A process for the growth of new, and difficult-to-synthesize, metal oxide, and other mixed anion oxide-based, single crystals from a molten metal flux. Metal fluxes are new for the growth of metal oxide single crystals. Preliminary reactions proved that new phases and phases that normally require costly, extreme conditions do grow as single crystals. Batches of individual reactions are heat-treated to synthesize single crystals comprised of oxygen with one or more transition, alkaline-earth and/or lanthanide metals, and can also include other anions like chalcogens or pnictogens, or halides. The reactivity and the propensity for crystallization of charge compensated single crystals from alkaline earth fluxes have been made evident by the results presented here.
摘要:
A method of in-situ transfer during fabrication of a component comprising a 2-dimensional crystalline thin film on a substrate is disclosed. In one embodiment, the method includes forming a layered structure comprising a polymer, a 2-dimensional crystalline thin film, a metal catalyst, and a substrate. The metal catalyst, being a growth medium for the two-dimensional crystalline thin film, is etched and removed by infiltrating liquid to enable the in-situ transfer of the two-dimensional crystalline thin film directly onto the underlying substrate.
摘要:
A method for making a superconducting article includes the steps of providing a biaxially textured substrate. A seed layer is then deposited. The seed layer includes a double perovskite of the formula A2B′B″O6, where A is rare earth or alkaline earth metal and B′ and B″ are different rare earth or transition metal cations. A superconductor layer is grown epitaxially such that the superconductor layer is supported by the seed layer.
摘要:
A method of manufacturing a superconducting thin film material includes a vapor phase step of forming a superconducting layer by a vapor phase method and a liquid phase step of forming a superconducting layer by a liquid phase method so that the latter superconducting layer is in contact with the former superconducting layer. Preferably, the method further includes the step of forming an intermediate layer between the former superconducting layer and a metal substrate. The metal substrate is made of a metal, and preferably the intermediate layer is made of an oxide having a crystal structure of any of rock type, perovskite type and pyrochlore type, and the former superconducting layer and the latter superconducting layer both have an RE123 composition. Accordingly, the critical current value can be improved.
摘要:
A method and an apparatus which permits making a composite oxide thin film excellent in crystallinity easily and at a low temperature, with the capability of controlling the basic unit cell structure as desired, and without the need for a post annealing, as well as a composite oxide thin film thereby, especially a Cu group high temperature superconducting thin film, are disclosed. A thin Cu group high temperature superconducting film, which is constituted of a charge supply block (1) and a superconducting block (2), is formed on a substrate by alternately sputtering from a sputtering target having a composition of the charge supply block (1) and a sputtering target having a composition of the superconducting block (2) and repeating such an alternate sputtering operation a number of times needed for the film to reach a desired thickness. The first sputtering target for the charge supply block has a charge supply block composition in which Cu atoms are partly substituted with atoms of an element having a structure stabilizing effect.
摘要:
The invention relates to a technique for forming a single crystalline thin film of good quality on an underlayer. Such a technique is suitably applicable to provision of an oxide high-temperature superconductor thin film usable for a superconducting wire material, a superconducting device or the like. The single crystalline thin film formed on a substratum is made of a substance different from that of the substratum. A specific atomic layer contained in common in the substratum and the thin film is shared at an interface between the substratum and the thin film. In a region as adjacent to the interface as 100 or fewer unit cells of the thin film apart from the interface, a ratio of crystalline region having grown with an orientation of ±2 degrees or less deviation angle on the basis of a crystal orientation of the substratum is 50% or more.
摘要:
The present invention is an tri-phase epitaxy method for preparing a single crystal oxide thin film, comprising the steps of depositing on a substrate an oxide thin film serving as a seed layer and having the same composition as that of an oxide thin film to be formed, depositing on the seed layer a thin film comprising a substance capable of being melted and liquidized by heat from the substrate and dissolving the oxide to be subsequent by deposited onto the seed layer, heating the substrate to form a liquid layer, and depositing an oxide on the seed layer through the liquid layer by use of a vapor-phase epitaxy method to form the single crystal oxide thin film. In this method, the oxygen partial pressure on the liquid layer is set in the range of 1.0 to 760 Torr during the film-forming step.
摘要:
Compositions having the nominal formula BiaSrbCacCu3Ox wherein a is from about 1 to 3, b is from about ⅜ to 4, c is from about {fraction (3/16)} to 2, x=(1.5 a+b+c+y) where y is from about 2 to 5, with the proviso that “b+c” is from about {fraction (3/2)} to 5, containing a metal oxide phase of the formula Bi2Sr3−zCazCu2O8+w wherein z is from about 0.1 to 0.9 w is greater than zero but less than 1, are superconducting. Processes for manufacturing such compositions and for using them are disclosed.
摘要翻译:具有标称式a的组合物为约1至3,b为约3/8至4,c为约{分数(3/16至2,x =(1.5a + b + c + y),其中 约2至5,条件是“b + c”为大约{级分(3/2至5,含有式Bi2Sr3-zCazCu2O8 + w的金属氧化物相,其中z为约0.1至0.9w大于 零但小于1,是超导的。公开了制造这种组合物和使用它们的方法。
摘要:
Disclosed is an oxide high temperature superconductor having a crystalline substrate of low dielectric constant formed thereon with a thin film of the oxide high temperature superconductor that is high in crystallographic integrity and excels in crystallographic orientation as well as a method of making such an oxide high temperature superconductor. In fabricating an oxide high temperature superconductor containing Ba as a constituent element and having such a substrate formed thereon with a thin film of the oxide high temperature superconductor, a first buffer layer composed of CeO3 is formed on a sapphire R (1, null1, 0, 2) face substrate for reducing lattice mismatch between the sapphire R (1, null1, 0, 2) face substrate and the oxide high temperature superconductor thin film, and a second buffer layer composed of such an oxide high temperature superconductor but in which Ba is substituted with Sr is formed on the first buffer layer made of CeO3 to allow the oxide high temperature superconductor thin film to be formed on the second buffer layer. Thus, if the first buffer layer for reducing the lattice mismatch between the sapphire R (1, null1, 0, 2) face substrate and the oxide high temperature superconductor thin film is liable to an interfacial reaction with Ba from the oxide high temperature superconductor thin film, the second buffer layer prevents the interfacial reaction, thereby permitting the epitaxial growth of an oxide high temperature superconductor thin film that excels on both crystallographic integrity and crystallographic orientation.