The influence of cation non-stoichiometry on the properties of undoped and gadolinia-doped barium cerate

• Published in: Solid state ionics Vol. 97; no. 1; pp. 443 - 455
• Main Authors: Shima, D., Haile, S.M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.1997; Elsevier Science
• Subjects: BaCeO 3; Barium cerate; Condensed matter: structure, mechanical and thermal properties; Defect chemistry; Diffusion in solids; Exact sciences and technology; Physics; Proton conduction; Self-diffusion and ionic conduction in nonmetals; Stoichiometry; Transport properties of condensed matter (nonelectronic); BaCeO 3; Stoichiometry; Defect chemistry; Barium cerate; Proton conduction; Inorganic compounds; Gadolinium additions; Barium oxides; Ternary compounds; Ionic conductivity; Doped materials; Rare earth compounds; Experimental study; Cerium oxides; Nonstoichiometry; Crystal structure
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/S0167-2738(97)00029-5

The influence of A:B cation non-stoichiometry on the structural and electrical properties of BaCeO 3 and of 15% Gd-doped BaCeO 3 has been investigated. X-ray powder diffraction and water uptake measurements suggest the occupation of Ba sites by Gd in barium-deficient, doped materials. This phenomenon is exacerbated by high temperature processing, which causes additional loss of barium. The relationship between defect chemistry, stoichiometry and conductivity, as measured by a.c. impedance spectroscopy, is discussed.