Abstract
A point defect modeling study of the oxygen nonstoichiometry and high-temperature electrical properties of La2-xAExCuO4-y (AE = Ba, Sr, and Ca) systems indicates that, whereas oxygen excess (y0) results primarily from dopant-vacancy associates at large x; isolated oxygen vacancies are apparently minority defect species. The onset of oxygen deficiency due to dopant-vacancy associates occurs at x≈0.15 in the AE = Ba and Sr systems but at x≈0.05 in the AE = Ca system. Ideal ionic point defect behavior persists to x≈0.4 in the AE = Ba and Ca systems and to x≈0.5 in the AE = Sr system. A premature flattening of the electrical properties above x≈0.2 occurs in the AE = Ba and Sr systems. Reasons for the extensive range of ideal ionic behavior and for the onset of degenerate electronic behavior are discussed, as are ramifications for high-Tc superconductivity in these materials.
| Original language | English |
|---|---|
| Pages (from-to) | 81-88 |
| Number of pages | 8 |
| Journal | Journal of the American Ceramic Society |
| Volume | 77 |
| Issue number | 1 |
| Publication status | Published - Jan 1994 |
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ASJC Scopus subject areas
- Ceramics and Composites
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Point defect modeling of La2CuO4-based superconductors. / Shen, Li; Salvador, Paul A.; Mason, Thomas O.
In: Journal of the American Ceramic Society, Vol. 77, No. 1, 01.1994, p. 81-88.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Point defect modeling of La2CuO4-based superconductors
AU - Shen, Li
AU - Salvador, Paul A.
AU - Mason, Thomas O
PY - 1994/1
Y1 - 1994/1
N2 - A point defect modeling study of the oxygen nonstoichiometry and high-temperature electrical properties of La2-xAExCuO4-y (AE = Ba, Sr, and Ca) systems indicates that, whereas oxygen excess (y0) results primarily from dopant-vacancy associates at large x; isolated oxygen vacancies are apparently minority defect species. The onset of oxygen deficiency due to dopant-vacancy associates occurs at x≈0.15 in the AE = Ba and Sr systems but at x≈0.05 in the AE = Ca system. Ideal ionic point defect behavior persists to x≈0.4 in the AE = Ba and Ca systems and to x≈0.5 in the AE = Sr system. A premature flattening of the electrical properties above x≈0.2 occurs in the AE = Ba and Sr systems. Reasons for the extensive range of ideal ionic behavior and for the onset of degenerate electronic behavior are discussed, as are ramifications for high-Tc superconductivity in these materials.
AB - A point defect modeling study of the oxygen nonstoichiometry and high-temperature electrical properties of La2-xAExCuO4-y (AE = Ba, Sr, and Ca) systems indicates that, whereas oxygen excess (y0) results primarily from dopant-vacancy associates at large x; isolated oxygen vacancies are apparently minority defect species. The onset of oxygen deficiency due to dopant-vacancy associates occurs at x≈0.15 in the AE = Ba and Sr systems but at x≈0.05 in the AE = Ca system. Ideal ionic point defect behavior persists to x≈0.4 in the AE = Ba and Ca systems and to x≈0.5 in the AE = Sr system. A premature flattening of the electrical properties above x≈0.2 occurs in the AE = Ba and Sr systems. Reasons for the extensive range of ideal ionic behavior and for the onset of degenerate electronic behavior are discussed, as are ramifications for high-Tc superconductivity in these materials.
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UR - http://www.scopus.com/inward/citedby.url?scp=0028367886&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0028367886
VL - 77
SP - 81
EP - 88
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 1
ER -