In:
Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 01, No. 07n08 ( 1987-11), p. 289-293
Abstract:
In this paper the differences in diffraction intensities from some crystal planes in the X-ray diffraction patterns of high T c Y-Ba-Cu-O system superconductors prepared by different processing conditions and the difference among various structure cells in references are interpreted using computer fitting. The results suggest that there exists two structure cells in the single phase YBa 2 Cu 3 O 7−x samples. Both structure cells have the same crystal symmetry and almost the same lattice parameters, a=3.821Å, b=3.892Å and c=11.676Å, but the different distortion degree of Cu2-O plane. According to EPR spectra measured on the same samples, it is considered that the improvement of superconductivity for the samples prepared by two-step annealing in flowing oxygen may be related to concentration of the structure cell with more serious distortion on the Cu2-O plane.
Type of Medium:
Online Resource
ISSN:
0217-9849
,
1793-6640
DOI:
10.1142/S0217984987000417
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
1987
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