Thermal treatment of superconductor thin film of the BSCCO system using domestic microwave oven

Abstract

In this work we report the preparation of a superconductor thin film of the BSCCO system using a good quality powder with nominal composition Bi 1.8 Pb 0.4 S r 2 CaCu 2 O x which was thermally treated using a domestic microwave oven (2.45 GHz, 800 W). This film was grew on a single crystal of LaAlO 3 (100) substrate and exhibited a crystalline structure with the c-axis perpendicular to the plane of the substrate. An onset superconducting transition temperature was measured at 80 K.

BSCCO superconductor micro/nanofibers produced by solution blow-spinning technique

“…Fig. 3(c) shows a fibrous structure with plate-like grains that is characteristic of the Bi-2212 [30] superconductor material; it forms a continuous length with~500-nm diameter in accordance with the histogram shown in Fig. 2(b).…”

“…shows the electrical resistance versus temperature behavior of the BSCCO10% sample. Ohmic behavior can be observed above 90 K; below this temperature, electrical resistance decreases sharply with temperature, suggesting a potential transition from the normal to the superconductor state of the sample, as discussed in literature [30]. The sample has biphasic nature (Bi-2212 and Bi-2201), and it shows nonzero resistance at 70 K owing to the presence of the Bi-2201 phase, which is in the normal state.…”

“…The crystallite size was estimated to be~160 nm by using the Scherrer equation [26]. This value was larger than those reported in literature, which varied between 20 and 81 nm [30,33] for powders produced by sol-gel synthesis and thin films, respectively. This suggests that fibers produced by SBS, as described before, are probably subjected to some microstructural modifications, maybe owing to the directional growth of the grains, and this reflects in changes in the crystallite size.…”

Preparation and characterization of a homemade Josephson junction prepared from a thin film sintered in a domestic microwave oven

“…The down triangles indicate the (2212), the "" symbol indicates the Ca 2 PbO 4 and the "o" symbol represents the (2223). Then, it can be noted a predominance of the Bi-(2212) phase however, there was also the formation of Ca 2 PbO 4 , a non-superconducting material 9,10 . In Figure 2(b) is shown the XRD analysis of the commercial powder.…”

“…The temperature control was obtained using a temperature controller with a K-type thermo-couple in contact with the SiC pellet. Figure 1 shows the experimental scheme for the sample preparation in according to Silveira et al 9 . The structural characterization of the film was performed by x-ray diffraction (XRD), by using a Shimadzu di⋅ractometer model XRD-6000, in Bragg-Brentano geometry, using a CuK α1 radiation with wavelength of 1,542 Å and step size of 0.02 o .…”