Determination of Layer Structure in Sr1-xLaxTiO3+0.5x (0 < x < 1) Compounds by High-Resolution Electron Microscopy

High resolution electron microscopy has shown that samples of La-substituted SrTiO3 prepared in oxidizing atmospheres contain oxygen-rich layers parallel to a perovskite {110} plane. These layers have the same structure as those found in La2Ti2O7 and explain how the excess oxygen required by the alt...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 117; no. 1; pp. 88 - 96
Main Authors Bowden, M.E., Jefferson, D.A., Brown, I.W.M.
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 01.06.1995
Elsevier
Subjects
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Inorganic compounds
Physics
Salts
Structure of solids and liquids; crystallography
Structure of specific crystalline solids
Inorganic compounds
Layered crystals
Transition element compounds
Rare earth compounds
Experimental study
Order disorder
High-resolution methods
Nonstoichiometry
Lanthanum Titanates
Ion substitution
Solid solutions
Strontium titanates
Chemical composition
Quaternary compounds
TEM
Lattice image
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Summary:High resolution electron microscopy has shown that samples of La-substituted SrTiO3 prepared in oxidizing atmospheres contain oxygen-rich layers parallel to a perovskite {110} plane. These layers have the same structure as those found in La2Ti2O7 and explain how the excess oxygen required by the altervalent substitution is incorporated into the structure. At low levels of substitution, layers occurred predominantly in clusters irregularly distributed within the host perovskite. Increasing substitution, and therefore increasing frequency of the layers, led to new ordered compounds corresponding to the n = 4.5 and n = 5 members of the compositional series Srn-4La4TinO3n+2.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1995.1250