title: Site Redistribution, Partial Frozen-in Defect Chemistry, and Electrical Properties of Ba1-x(Zr,Pr)O3-δ.
abstract: Changes in nominal composition of the perovskite (ABO3) solid solution Ba1-x(Zr,Pr)O3-δ 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 °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.
authors: Isabel
authors: I
authors: Antunes
authors: Sergey
authors: S
authors: Mikhalev
authors: Institute of Ceramics and Glass, CSIC , Cantoblanco, 28049 Madrid, Spain.
authors: Glenn Christopher
authors: GC
authors: Mather
authors: Vladislav Vadimovich
authors: VV
authors: Kharton
authors: IFIMUP and IN, Department of Physics and Astronomy, Faculty of Sciences, University of Porto , 4196 007 Porto, Portugal.
authors: Fábio Gabriel
authors: FG
authors: Figueiras
authors: Adriana
authors: A
authors: Alves
authors: Joana
authors: J
authors: Rodrigues
authors: Maria Rosário
authors: MR
authors: Correia
authors: Jorge Ribeiro
authors: JR
authors: Frade
authors: Duncan Paul
authors: DP
authors: Fagg