Site Redistribution, Partial Frozen-in Defect Chemistry, and Electrical Properties of Ba1-x(Zr,Pr)O3-delta
authors Antunes, I; Milchalev, S; Mather, GC; Kharton, VV; Figueiras, FG; Alves, A; Rodrigues, J; Correia, MR; Frade, JR; Fagg, DP
nationality International
journal INORGANIC CHEMISTRY
keywords DOPED BAPRO3; OXYGEN NONSTOICHIOMETRY; TRANSPORT-PROPERTIES; RAMAN-SCATTERING; CERAMICS; BATIO3; CONDUCTIVITY; STABILITY; OXIDE; MECHANOSYNTHESIS
abstract Changes in nominal composition of the perovskite (ABO(3)) solid solution Ba1-x(Zr,Pr)O3-delta and adjusted firing conditions at very high temperatures were used to induce structural changes involving site redistribution and frozen-in point defects, as revealed by Raman and photoluminescence spectroscopies. Complementary magnetic measurements allowed quantification of the reduced content of Pr. Weak dependence of oxygen stoichiometry with temperature was obtained by coulometric titration at temperatures below 1000 degrees C, consistent with a somewhat complex partial frozen-in defect chemistry. Electrical conductivity measurements combined with transport number and Seebeck coefficient measurements showed prevailing electronic transport and also indicated trends expected for partial frozen-in conditions. Nominal Ba deficiency and controlled firing at very high temperatures allows adjustment of structure and partial frozen-in defect chemistry, opening the way to engineer relevant properties for high-temperature electrochemical applications.
publisher AMER CHEMICAL SOC
issn 0020-1669
year published 2016
volume 55
issue 17
beginning page 8552
ending page 8563
digital object identifier (doi) 10.1021/acs.inorgchem6b01084
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000382713900039
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