Recent Advances in Processing and Fabrication of Ceramic Superconductors

Poeppel, R.B.; Ferrando, W. A.; Karmarkar, S. D.; Kerr, J. M.; Hesse, P. W.; Divecha, A. P.

doi:10.1007/978-94-011-2462-1_48

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“…The powder-in-tube (PIT) technique has been used extensively for processing Bi-Pb-Sr-Ca-Cu-O (BSCCO) superconductors by the wire/tape industry (Balachandran, 1998;Sandhage, 1991). During PIT processing, the solid solution Bi 2 (Sr, Ca) 4 O_,.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of the monoclinic perovskite Sr_3.94Ca_1.31Bi_2.70O₁₂

et al. 2000

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The crystal structure of the low-temperature oxidized form of Sr^^CaigsBi^O^j has been determined using a combination of neutron, synchrotron, and laboratory X-ray powder diffraction data. The structure is pseudo-orthorhombic; systematic absences and successful refinement indicated the true structure to be monoclinic, with space group P2,/n. Structural refinement using only neutron powder data yielded the lattice parameters a = S.38 898 (29) A, £=5.99 334(21) A, c=5.89 586(20) A, /3= 89.997(8)°, and V=296.43(3) A 3 . This compound is a distorted perovskite phase [described in the perovskite ABO 3 formula as Sr(Bi 0 7 Cao 3 )O 3 ] with ordering of the M-site cations, resulting in the formula A 2 MM'O 6 . In this ordered structure, the A sites are solely occupied by Sr, the M sites mainly by Bi, while on the M' sites Bi and Ca are distributed in an approximate ratio of 2:3. The MO 6 and M'O 6 octahedra share corners, and are tilted with respect to the neighboring layers with an angle of -15° around all three axes. The tilt system symbol is a + a~a~ according to Glazer notation. All Bi ions are in the 5 + oxidation state. © 2000 International Centre for Diffraction Data. [S0885-7156(00)00304-3]

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Section: Introductionmentioning

confidence: 99%