Abstract
Oxygen nonstoichiometry and thermodynamic stability of Zn–doped YBaCo4−xZnxO7+δ oxides were investigated by solid state coulometric titration and EMF-method, respectively. As a result, significant zinc doping was shown to increase the stability of YBaCo4−xZnxO7+δ oxides in oxidizing atmosphere. However enrichment of YBaCo4−xZnxO7+δ oxides by zinc results in increasing their reducibility since the low pO2 stability limit shifts towards higher pO2 values upon doping. Substitution of zinc for cobalt in YBaCo4−xZnxO7+δ oxides was also found to narrow their oxygen homogeneity region. Total conductivity and Seebeck coefficient of YBaCo4−xZnxO7+δ oxides were measured simultaneously using 4-probe dc-method. The defect structure of YBaCo4−xZnxO7+δ oxides was successfully analysed using Kröger-Vink approach. The data on oxygen nonstoichiometry, total conductivity and Seebeck coefficient of the thermodynamically stable YBaCo4−xZnxO7+δ (x=0, 1) oxides were found to be quite consistent with the proposed model of their defect structure.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
