Effect of acceptor size and hole degeneracy on oxygen nonstoichiometry of La2NiO4+δ

• Published in: Solid state ionics Vol. 232; pp. 129 - 137
• Main Authors: Kim, Hong-Seok, Yoo, Han-Ill
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 07.02.2013
• Subjects: Acceptor-doped La2NiO4 + δ; Defect structure; Fermi–Dirac integral half; Hole degeneracy; Nonstoichiometry; Positive deviation; Hole degeneracy; Fermi–Dirac integral half; Defect structure; Positive deviation; Acceptor-doped La2NiO4+δ; Nonstoichiometry

It is conjectured that ever-hyperstoichiometric La2NiO4+δ tends to incorporate oxygen interstitials in the rocksalt layers to mitigate the tensile/compressive stress at the LaO–rocksalt/LaNiO3–perovskilte layer interface due to their lattice mismatch, and the unusual positive deviation from ideal of...