Optimizing thermal conduction in bulk polycrystalline SrTiO3−δ ceramics via oxygen non-stoichiometry
| Autor: | John Ballato, Terry M. Tritt, Husam N. Alshareef, Taghi Darroudi, Courtney Kucera, Sriparna Bhattacharya, Ramakrishna Podila, Joseph R. Gladden, Apparao M. Rao, Mehmet Karakaya, Rasheed Adebisi, Arash Mehdizadeh Dehkordi |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Phonon scattering chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Thermal conduction Thermoelectric materials 01 natural sciences Oxygen symbols.namesake Thermal conductivity chemistry 0103 physical sciences symbols Physical chemistry General Materials Science Crystallite 0210 nano-technology Raman spectroscopy Stoichiometry |
| Zdroj: | MRS Communications. 8:1470-1476 |
| ISSN: | 2159-6867 2159-6859 |
| DOI: | 10.1557/mrc.2018.220 |
| Popis: | while SrTiO3 exhibits promising electronic transport properties, its high thermal conductivity (κ) is detrimental for its use as a thermoelectric material. Here, we investigate the influence of oxygen non-stoichiometry on κ in bulk SrTiO3 ceramics. A significant reduction in κ was achieved in oxygen deficient SrTiO3−δ, owing to the presence of oxygen vacancies that act as phonon scattering centers. Upon oxidation of SrTiO3−δ, the κ of pristine SrTiO3 was recovered, suggesting that oxygen vacancies were indeed responsible for the reduction in κ. Raman spectroscopy was used as an independent tool to confirm the reduction of oxygen vacancies in SrTiO3−δ upon oxidation. |
| Databáze: | OpenAIRE |
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