Influence of reducing atmosphere on the defect chemistry of lead lanthanum zirconate titanate (8/65/35)
| Autor: | Rüdiger-A. Eichel, Emre Erdem, S. Hummelt, C.H. Rüscher, Silke Schaab, Holger Fritze, M. Schulz, Torsten Granzow |
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| Rok vydání: | 2012 |
| Předmět: |
education.field_of_study
Absorption spectroscopy Hydrogen Chemistry Annealing (metallurgy) Reducing atmosphere Population Inorganic chemistry Analytical chemistry chemistry.chemical_element General Chemistry Partial pressure Condensed Matter Physics Oxygen Titanate General Materials Science education |
| Zdroj: | Solid State Ionics. 228:56-63 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2012.09.003 |
| Popis: | The defect structure of lanthanum-modified lead-zirconate-titanate (PLZT) is altered by annealing at 700 °C in different reducing atmospheres and studied by conductivity measurements, different spectroscopic techniques and determination of the thermally stimulated depolarization current (TSDC). It is found that annealing at an oxygen partial pressure of p O 2 10 − 16 bar leads to the formation of oxygen vacancies V O • • or V O × . If hydrogen is present in the reducing atmosphere, it can be incorporated as either H O • or OH O • . The defects can be evidenced in both the IR and UV/VIS absorption spectra. Additionally, high levels of reduction cause a shift in the Fermi level, leading to the population of intrinsic Fe impurities, which can possibly be utilized as photorefractive centers. |
| Databáze: | OpenAIRE |
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