Annealing of tweed microstructure in high T[sub c] superconductors studied by a computer simulation

Journal Article · Sun Feb 28 23:00:00 EST 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90017-M· OSTI ID:6239039

Parlinski, K ^[1]; Salje, E K.H. ^[2]; Heine, V ^[3]

---

1. IRC Superconductivity, Cambridge (United Kingdom) Univ. of Cambridge, (United Kingdom). Dept. of Earth Sciences Cavendish Lab., Cambridge (United Kingdom) Institute of Nuclear Physics, Cracow (Poland)
2. IRC Superconductivity, Cambridge (United Kingdom) Univ. of Cambridge, (United Kingdom). Dept. of Earth Sciences
3. Cavendish Lab., Cambridge (United Kingdom)

The development of tweed texture during annealing is investigated using computer simulation. The model is a two-dimensional one corresponding to an oxygen deficit layer of a higher temperature superconducting crystal of YBa[sub 2]Cu[sub 3]O[sub 7]. The model may be taken as generic, including three dimensional systems, with regard to its semiquantitative behavior and shows a ferroelastic phase transition due to local strains connected with the oxygen ordering. After quenching from a high temperature, a pronounced (1,1) micro-twinning appears. It starts from a fine irregular tweed-like pattern, with the spacing between domain walls becoming more regular while coarsening during the anneal. Annealing at lower temperatures, but not near T[sub c], produces an intermediate stripe structure before annealing to a single domain. From the rate at which the distance between domain walls increases, a temperature-time-transition (T-T-T) diagram has been constructed which shows strong similarities to those obtained from experiments. So do the other features mentioned.

• OSTI ID: 6239039
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:3; ISSN 0956-7151; ISSN AMATEB
• 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
COMPUTERIZED SIMULATION
COPPER COMPOUNDS
COPPER OXIDES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIMULATION
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES