Structural, morphological and electrical properties of alumina/YAG composites as solid electrolyte for IT - SOFC
| Autor: | Marija Stojmenović, Vladimir Dodevski, Snežana Pašalić, Ivana B. Stojković-Simatović, Milan Kragović, Željko Radovanović, Adela Egelja |
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| Rok vydání: | 2018 |
| Předmět: |
Electrical conductivity
Materials science 02 engineering and technology lcsh:Chemical technology law.invention chemistry.chemical_compound law Yttrium aluminium garnet Materials Chemistry Relative density lcsh:TP1-1185 Calcination Composite material Composites 020502 materials Metals and Alloys Al2O3-YAG 021001 nanoscience & nanotechnology Condensed Matter Physics Dielectric spectroscopy 0205 materials engineering chemistry Ceramics and Composites Grain boundary Particle size Crystallite 0210 nano-technology Powder diffraction |
| Zdroj: | Science of Sintering Science of Sintering, Vol 50, Iss 3, Pp 357-369 (2018) |
| ISSN: | 1820-7413 0350-820X |
| Popis: | Alumina/YAG composites (AYX_t) with high relative density (99.2 %TD) were successfully obtained by mixing commercial alumina powder with different volume fractions of yttrium aluminium garnet (Y3Al5O12-YAG; 7, 14, 21 and 28). YAG was synthetized by nitrate glycine reaction in the form of precursor powder. Polycrystalline YAG powder was obtained by calcination at 950?C for 2 h. Additionally, obtained compositions were characterized by XRD, SEM, EDX and electrochemical impedance spectroscopy. By XRPD analysis was found that the particle size of YAG powders lies in the nanometric range (being lower than 35 nm). By SEM microphotographs of composites were confirmed the formation of a conductive path consisting from mutually interconnected YAG particles. This was confirmed by the electrochemical impedance spectroscopy. The highest electrical conductivity of grain (?g) and grain boundary (?gb) at 700?C amounted to 2.22?10-2 ?-1cm-1and 9.44?10-3 ?-1cm-1, respectively, was measured in the composite containing 21 vol% of YAG. |
| Databáze: | OpenAIRE |
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