Crystallographic description of phases in the Y-Ba-Cu-O superconductor

Journal Article · Fri May 01 04:00:00 EDT 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.7238· OSTI ID:6878206

Hazen, R M; Finger, L W; Angel, R J; Prewitt, C T; Ross, N L; Mao, H K; Hadidiacos, C G; Hor, P H; Meng, R L; Chu, C W; others, and

Single-crystal x-ray techniques were used to determine two structures that comprise the Y-Ba-Cu-O superconductor. A green phase has the orthorhombic Y/sub 2/BaCuO/sub 5/ structure. An opaque phase (YBa/sub 2/Cu/sub 3/O/sub 6+//sub x/, 0less than or equal toxless than or equal to1.0) is tetragonal (a = 3.859 A, c = 11.71 A; space group P4-barm2;Z = 1). The structure is related to a 1:1:3 ABO/sub 3/ perovskite: Ba and Y order in A sites and Cu is in B sites. Systematic oxygen vacancies between adjacent copper atoms lead to a fivefold-coordinate Cu in proximity to Y and a twofold-coordinate Cu in the vicinity of the Ba site.

• Research Organization: Geophysical Laboratory, Carnegie Institution of Washington, 2801 Upton Street NW, Washington, D.C. 20008
• OSTI ID: 6878206
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:13; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
SCATTERING
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VACANCIES
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES