Low temperature synthesis of Li and Cl added Bi-2212 superconductors

Noro, Masaki; Andoh, Hiroya; Murotani, Hideaki; Sugiura, Toshio; Tsukamoto, Takayuki

doi:10.1016/j.phpro.2012.03.432

Cited by 3 publications

(1 citation statement)

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“…The main diffraction peaks of the sample surface and interior could be indexed in accordance with the Bi-2212 structure, although potassium peaks were not detected. For the sample doped with K 2 CO 3 , we obtained lattice parameters for the sample surface of a = 5.423 Å, b = 5.459 Å, and c = 31.058 Å, which are approximate to typical Bi-2212 values [4], [9]. In addition, the lattice parameters for the sample interior were evaluated as a = 5.415 Å, b = 5.437 Å, and c = 31.006 Å, which are negligibly smaller than those of the surface.…”

Section: Samplesmentioning

confidence: 97%

Transport Properties of Melt-Cast-Processed Bi-2212 Bulk Superconductor Bars

Oikawa

Higashi

Murotani

et al. 2015

IEEE Trans. Appl. Supercond.

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Bulk materials of high-critical-temperature superconductors (HTSs) are promising for current leads and faultcurrent limiters because of negligibly small Joule heating under current transport and very low thermal conductivity. We consider that a Bi-2212 bulk superconductor prepared by the melt-casting process (MCP) is one of the best materials for these applications. In addition, MCP is well known to be a simple and economic process, and also served as a method for obtaining any sizes of HTS bulks consent to requirements for practical applications. In this paper, we present a study on the transport and quench properties of Bi-2212 bulk superconductors doped with K 2 CO 3 . First, the MCP samples doped with K 2 CO 3 were analyzed by using an X-ray diffractometer and X-ray fluorescence spectrometry. In addition, the critical temperatures of the MCP samples doped with K 2 CO 3 were observed. Then, we have investigated the relations between the critical current value and the doping quantity of K 2 CO 3 . The value of the direct-current critical current was determined at 77 K, and the self-fields derived from the electric field versus the transport current characteristics were obtained using a criterion of 1 μV/cm. Finally, the alternating-current transport properties of the MCP sample were measured, and we have discussed the frequency dependence of the critical current with current distributions.

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Section: Samplesmentioning

confidence: 97%