Processing of crack-free high density polycrystalline LiTaO3 ceramics
| Autor: | Terry G. Holesinger, Ching-Fong Chen, Eric L. Tegtmeier, Jacob Ivy, Graham King, Geoff L. Brennecka, Pin Yang |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Rietveld refinement Metallurgy Sintering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Lithium aluminate Microstructure Hot pressing 01 natural sciences Atomic and Molecular Physics and Optics Grain size Electronic Optical and Magnetic Materials Grain growth chemistry.chemical_compound chemistry 0103 physical sciences Crystallite Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 28:3725-3732 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-016-5980-5 |
| Popis: | This work has successfully achieved high density (99.9%) polycrystalline LiTaO3. The keys to the high density without cracking were the use of LiF-assisted densification to maintain fine grain size as well as the presence of secondary lithium aluminate phases as grain growth inhibitors. The average grain size of the hot pressed polycrystalline LiTaO3 is less than 5 μm, limiting residual stresses caused by the anisotropic thermal expansion. Dilatometry results clearly indicate liquid phase sintering via the added LiF sintering aid. Efficient liquid phase sintering allows densification during low temperature hot pressing. Electron microscopy confirmed the high-density microstructure. Rietveld analysis of neutron diffraction data revealed the presence of LiAlO2 and LiAl5O8 minority phases and negligible substitutional defect incorporation in LiTaO3. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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