Cation interdiffusion in polycrystalline calcium and strontium titanate

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb06923.x· OSTI ID:5159799

Butler, E P; Jain, H; Smyth, D M ^[1]

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1. Dept. of Materials Science and Engineering, Whitaker Lab., No. 5, Lehigh Univ., Bethlehem, PA (US)

This paper discusses a method that has been developed to study bulk lattice interdiffusion between calcium and strontium titanate by fabrication of a diffusion couple using cosintering. The measured interdiffusion coefficients, D(C), indicate that strontium impurity diffusion in calcium titanate occurs at a faster rate than calcium impurity diffusion in strontium titanate. These interdiffusion coefficients are composition independent when the concentration of the calcium cation exceeds that of the strontium cation; otherwise D(C) is strongly composition dependent. Investigations into the effect of cation nonstoichiometry give results that are consistent with a defect incorporation reaction in which excess TiO{sub 2}, within the solid solubility limit, produces A-site cation vacancies as compensating defects. The interdiffusion coefficients increase with increasing concentrations of TiO{sub 2}, so it is concluded that interdiffusion of these alkaline-earth cations in their titanates occurs via a vacancy mechanism.

• OSTI ID: 5159799
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:4; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360602* -- Other Materials-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CATIONS
CHARGED PARTICLES
CRYSTALS
DIFFUSION
FABRICATION
IONS
OXYGEN COMPOUNDS
POLYCRYSTALS
SINTERING
STRONTIUM COMPOUNDS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS