Hydroxyl Defect Effect on Reoxidation of Sc‐Doped ( Ba , Ca )( Ti , Zr ) O 3 Fired in Reducing Atmospheres
| Autor: | Christian Pithan, Chi Yuen Huang, Rainer Waser, Che Yi Su, Yu Ju Kao, Detlev F. Hennings |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Reducing atmosphere Inorganic chemistry chemistry.chemical_element Nanotechnology 02 engineering and technology Crystal structure Conductivity 021001 nanoscience & nanotechnology 01 natural sciences Acceptor Oxygen Dielectric spectroscopy chemistry 0103 physical sciences Materials Chemistry Ceramics and Composites Ionic conductivity Curie temperature 0210 nano-technology |
| Zdroj: | Journal of the American Ceramic Society. 99:1311-1317 |
| ISSN: | 1551-2916 0002-7820 |
| Popis: | The behavior of grain and grain-boundary conductivity of acceptor (Sc)-doped (Ba,Ca)(Ti,Zr)O3 ceramics sintered in moist reducing atmosphere and subsequently reoxidized in dry and moist atmosphere was investigated by means of impedance spectroscopy (IS). In moist firing atmosphere, water vapor was found to react with oxygen vacancies, forming positively charged hydroxyl defects (OH)0∙ on regular oxygen sites in the crystal lattice. Proton hopping is considered to raise the ionic conductivity significantly. Therefore, hydroxyl defects (OH)0∙ in turn influence the grain conduction. Hydroxyl defects (OH)0∙ are also considered to be responsible for alternations of the dielectric maximum at the Curie point. |
| Databáze: | OpenAIRE |
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