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Title: | Site Redistribution, Partial Frozen-in Defect Chemistry, and Electrical Properties of Ba1-x(Zr,Pr)O3-delta |
Author: | Antunes, Isabel Milchalev, Sergey Christopher Mather, Glenn Kharton, Vladislav Vadimovich Figueiras, Fabio Gabriel Alves, Adriana Rodrigues, Joana Correia, Maria Rosario Frade, Jorge Ribeiro Fagg, Duncan Paul |
Keywords: | DOPED BAPRO3 OXYGEN NONSTOICHIOMETRY TRANSPORT-PROPERTIES RAMAN-SCATTERING CERAMICS BATIO3 CONDUCTIVITY STABILITY OXIDE MECHANOSYNTHESIS |
Issue Date: | 2016 |
Publisher: | AMER CHEMICAL SOC |
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. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20962 |
DOI: | 10.1021/acs.inorgchem.6b01084 |
ISSN: | 0020-1669 |
Publisher Version: | 10.1021/acs.inorgchem.6b01084 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Site Redistribution Partial Frozen-in Defect Chemistry and Electrical Properties of Ba1-x(ZrPr)O3-δ_10.1021acs.inorgchem.6b01084.pdf | 875.67 kB | Adobe PDF |
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