Reproducibility of superconducting properties and suitability for specific applications by means of customised finish are two important attributes required from commercial 2G HTS wire. This paper reviews the consistent performance of SuperOx production 2G HTS wire and describes two novel customisation options: surround polyimide varnish insulation and composite bulk materials assembled with 2G HTS wires soldered together.
The growth of epitaxial CaF2 and SrF2 thin films on single crystalline r-cut sapphire, MgO (001) and biaxially textured Ni−W polycrystalline tape by low-temperature MOCVD is reported. A novel and efficient combination of alkaline-earth and fluorine precursors was used for deposition. A comprehensive study regarding the out- and in-plane orientation of the films and their surface morphology is presented using X-ray diffraction (XRD), Rutherford backscattering spectroscopy (RBS), energy-dispersive X-ray analysis (EDX), field-emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and electron backscatter diffraction (EBSD). The grown films are shown to have different crystallographic orientation depending on the film−substrate lattice mismatch and growth rate. Both types of films were obtained with pure c-axis orientation on all used substrates by either choosing the appropriate deposition conditions or postdeposition treatment. Epitaxial relations for all grown films are determined. A film−substrate interaction is described for the case of Ni−W substrate; a way to avoid it is proposed and successfully implemented. Certain growth conditions are shown to result in a unique three-dimensional ordered nanogrid structure of the films, making them perfect nanotemplated substrate for the epitaxial growth of other functional layers.
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