摘要:
A wet-chemical method for producing strip-shaped high-temperature superconductors with a substrate, optionally with a buffer layer and with a high-temperature superconductive layer is improved by increasing the texturing and the layer thickness of the high-temperature superconductive layer. To this end, precursor solutions are applied in layers to the substrate, of which the first is low in fluorine or does not contain fluorine, and the following have a fluorine concentration that increases with each layer.
摘要:
Compositions and methods for making rare earth metal-Ba2Cu3O7-δ films are described. The composition includes a barium (Ba) metal-organic compound, one or more rare earth metal organic compounds and a copper (Cu) metal-organic compound. The composition also includes a halogen. For example, the composition can include a halogenated organic solvent. The composition also includes a solvent having a boiling point greater than approximately 230° C. The precursor solution can also include a low-viscosity solvent that does not react with the halogenated solvent to produce water. A high-viscosity compound can also be included to enable the formation of thicker films. The resulting precursor solution can be deposited on a substrate, pyrolyzed at a heating rate greater than 50° C./minute, and crystallized to produce smooth, sheer films. Films greater than 100 nm in thickness can be produced with transport Jc values of 4×106 A/cm2 at 77° K on various substrates.
摘要翻译:描述了稀土金属Ba2Cu3O7-δ薄膜的组成和方法。 该组合物包括钡(Ba)金属 - 有机化合物,一种或多种稀土金属有机化合物和铜(Cu)金属 - 有机化合物。 该组合物还包括卤素。 例如,组合物可以包括卤化有机溶剂。 组合物还包括沸点大于约230℃的溶剂。前体溶液还可以包括不与卤化溶剂反应产生水的低粘度溶剂。 也可以包括高粘度化合物以形成更厚的膜。 所得的前体溶液可以沉积在基底上,以大于50℃/分钟的加热速率热解,并结晶以产生光滑的薄膜。 可以在各种基板上在77°K下的输送Jc值为4×10 6 A / cm 2的情况下制造厚度大于100nm的膜。
摘要:
A band-shaped high-temperature superconductor (HTSL) with high critical current density can be produced economically in a wet-chemical process. In the process, a first precursor solution is applied to a carrier, dried, and annealed. Additional precursor solutions may then be applied, with the first precursor solution contain little or no pinning centers, and any subsequent precursor solutions contains a higher concentration of pinning centers than the first precursor solutions.
摘要:
The invention provides a process for improving the fire resistance of a thermoplastic, thermoset or rubber organic polymer composition, characterised in that an alkoxysilane is added to a thermoplastic, thermosetting and rubber organic polymer composition and is heated to cause hydrolysis and condensation of the alkoxysilane. For example the alkoxysilane is a Benzoxazine triethoxysilane.