Structure of Ba2 YCu3O6.26 at 20 and 298K by single-crystal neutron diffration
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چکیده
The crystal structure of Ba2YCu3O8-03B4 (03B4=1.74) at 20K and 298K has been determined by single-crystal neutron diffraction. In contrast to the superconducting orthorhombic phase for which 6 ~ 1.1, this phase crystallizes in the tetragonal space group P4/MMM wtih 03B1 = 3.8573(4)Å and c = 11.7913(10)Å. The increase in oxygen vacancies compared to Ba2YCu3O8-03B4 (6 ~1.1.) is confined entirely to the sites in the plane midway between pairs of closest barium atoms. No significant differences were observed between the structures at 20K and 298K. J. Physique 48 (1987) 1407-1412 SEPTEMBRE 1987, Classification Physics Abstracts 74.70 61.12
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