Seifert, Klaus Thilo Paul (2010)
Lead-Free Piezoelectric Ceramics.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
A number of new lead-free electroceramics have been developed based on the known lead-free ferroelectric system Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3 (BNT-20BKT) at the morphotropic phase boundary by introducing small amounts of K0.5Na0.5NbO3-Bi0.5K0.5TiO3 (KNN-03BKT). With increasing KNN-03BKT content, the materials show a reduction in the ferroelectric and piezoelectric properties. At the same time, the achievable maximum electrostrain peaks at a KNN-03BKT concentration of 1 mol% with 0.46 % at 8 kV/mm. A matrix of 10 compositions surrounding the composition with the highest electrostrain at room temperature was created with 0, 1 and 2 % KNN-03BKT for BNT-19BKT, BNT-20BKT and BNT-21BKT as well as BNT-20BKT-0.5(KNN-03BKT). The large-strain temperature and frequency dependence of these compositions was investigated between room temperature and 200 °C and 50 mHz and 500 Hz. While 8 compositions show typical ferroelectric behaviour, BNT-20BKT-1(KNN-03BKT) and BNT-20BKT-2(KNN-03BKT) both show a high strain at room temperature but very low remanent polarisation and strain. They also both show lower frequency and temperature dependant variation in the large-field strain than the ferroelectric compositions.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2010 | ||||
Autor(en): | Seifert, Klaus Thilo Paul | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Lead-Free Piezoelectric Ceramics | ||||
Sprache: | Englisch | ||||
Referenten: | Rödel, Prof. Dr. Jürgen ; Karsten, Prof. Dr. Albe | ||||
Publikationsjahr: | 12 Dezember 2010 | ||||
Datum der mündlichen Prüfung: | 7 Dezember 2010 | ||||
URL / URN: | urn:nbn:de:tuda-tuprints-23657 | ||||
Kurzbeschreibung (Abstract): | A number of new lead-free electroceramics have been developed based on the known lead-free ferroelectric system Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3 (BNT-20BKT) at the morphotropic phase boundary by introducing small amounts of K0.5Na0.5NbO3-Bi0.5K0.5TiO3 (KNN-03BKT). With increasing KNN-03BKT content, the materials show a reduction in the ferroelectric and piezoelectric properties. At the same time, the achievable maximum electrostrain peaks at a KNN-03BKT concentration of 1 mol% with 0.46 % at 8 kV/mm. A matrix of 10 compositions surrounding the composition with the highest electrostrain at room temperature was created with 0, 1 and 2 % KNN-03BKT for BNT-19BKT, BNT-20BKT and BNT-21BKT as well as BNT-20BKT-0.5(KNN-03BKT). The large-strain temperature and frequency dependence of these compositions was investigated between room temperature and 200 °C and 50 mHz and 500 Hz. While 8 compositions show typical ferroelectric behaviour, BNT-20BKT-1(KNN-03BKT) and BNT-20BKT-2(KNN-03BKT) both show a high strain at room temperature but very low remanent polarisation and strain. They also both show lower frequency and temperature dependant variation in the large-field strain than the ferroelectric compositions. |
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Alternatives oder übersetztes Abstract: |
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Freie Schlagworte: | Lead-Free Piezoceramics ferroelectric piezoelectric KNN BNT-BKT | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau | ||||
Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
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Hinterlegungsdatum: | 15 Dez 2010 06:38 | ||||
Letzte Änderung: | 05 Mär 2013 09:44 | ||||
PPN: | |||||
Referenten: | Rödel, Prof. Dr. Jürgen ; Karsten, Prof. Dr. Albe | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 7 Dezember 2010 | ||||
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