Oxygen ordering and strain-related morphology in YBa sub 2 Cu sub 3- x O sub 7 systems

Conference · Wed Jan 01 00:00:00 EST 1992

OSTI ID:5332650

Cha, Zhi-Xiong; Zhu, Yimei; Welch, D O

Monte Carlo simulations were performed on an anisotropic lattice gas model which represent well the interactions between oxygen atoms in YBa{sub 2}Cu{sub 3}O{sub 7} systems doped with trivalent impurity atoms M such as Fe or Al. Concentration wave amplitudes obtained from these simulations were used to calculate the diffuse X-ray scattering intensity caused by the resulting displacement field using a concentration wave/displacement wave approach, and the results are compared with X-ray and electron diffraction data. The results suggest that the small orthorhombic domains associated with the oxygen cross-links'' around impurity atoms M cause the diffuse scattering intensity to fall off with the scattering wave vector difference q from a Bragg peak as 1/q{sup 2} for small q and as 1/q{sup 4} for larger q. We show that the average size of such domains can be obtained from diffuse X-ray scattering data.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5332650
• Report Number(s): BNL-47474; CONF-920722-1; ON: DE92014476
• Resource Relation: Conference: International conference on martensitic transformations, Monterey, CA (United States), 20-24 Jul 1992
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
CRYSTAL STRUCTURE
COPPER OXIDES
YTTRIUM OXIDES
CRYSTAL LATTICES
HIGH-TC SUPERCONDUCTORS
MONTE CARLO METHOD
MORPHOLOGY
OXYGEN
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELEMENTS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies