Sintering and piezoelectric properties of K0.5Na0.5NbO3 glass microspheres
- Laser-fused K0.5Na0.5NbO3 (KNN) powder of 75% transparent fraction has been sintered by pressureless sintering, spark plasma sintering (SPS), and hot isostatic pressing (HIP). The laser-fused KNN has a fictive temperature of 503 °C and an onset crystallization temperature of around 529 °C. The results have shown that sintering of the laser-fused KNN powder utilizing the viscous flow of the transparent microspheres (amorphous content)–at the kinetic window (26 °C)–is possible. The highest yield relative density is around 83% at a sintering temperature of 525 °C and at a sintering pressure of 280 MPa. Limited density has been reached because of formation of crystalline surface layers around the amorphous areas. The samples hipped at 525 °C have low piezoelectric coefficient d33 of 5 pC/N because of the residual porosity that led to early dielectric breakdown during the polarization. The sintering behavior, the resulting microstructure as well as the measured properties will beLaser-fused K0.5Na0.5NbO3 (KNN) powder of 75% transparent fraction has been sintered by pressureless sintering, spark plasma sintering (SPS), and hot isostatic pressing (HIP). The laser-fused KNN has a fictive temperature of 503 °C and an onset crystallization temperature of around 529 °C. The results have shown that sintering of the laser-fused KNN powder utilizing the viscous flow of the transparent microspheres (amorphous content)–at the kinetic window (26 °C)–is possible. The highest yield relative density is around 83% at a sintering temperature of 525 °C and at a sintering pressure of 280 MPa. Limited density has been reached because of formation of crystalline surface layers around the amorphous areas. The samples hipped at 525 °C have low piezoelectric coefficient d33 of 5 pC/N because of the residual porosity that led to early dielectric breakdown during the polarization. The sintering behavior, the resulting microstructure as well as the measured properties will be discussed.…
MetadatenAutor*innen: | F. J. Hmood, Jens GünsterORCiD, J. Heinrich |
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Dokumenttyp: | Zeitschriftenartikel |
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Veröffentlichungsform: | Verlagsliteratur |
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Sprache: | Englisch |
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Titel des übergeordneten Werkes (Englisch): | Journal of the European Ceramic Society |
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Jahr der Erstveröffentlichung: | 2015 |
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Herausgeber (Institution): | European Ceramic Society |
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Verlag: | Elsevier Ltd. |
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Verlagsort: | Oxford |
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Jahrgang/Band: | 35 |
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Ausgabe/Heft: | 15 |
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Erste Seite: | 4143 |
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Letzte Seite: | 4151 |
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Freie Schlagwörter: | Glass microspheres; KNN |
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DOI: | 10.1016/j.jeurceramsoc.2015.07.035 |
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ISSN: | 0955-2219 |
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ISSN: | 1873-619X |
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Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
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Datum der Freischaltung: | 20.02.2016 |
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Referierte Publikation: | Ja |
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Datum der Eintragung als referierte Publikation: | 25.11.2015 |
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