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Experimental Investigation of Strain Distributions and Polarization in Lead-based and Lead-free Ferroelectrics

Chen, Di

Abstract:
Experimental investigation of strain and polarization induced by uniaxial loads in lead-based and lead-free ferroelectrics was performed in this work. The commercial soft PZT (PIC 151) and (Na1/2Bi1/2)TiO3-based lead-free piezoceramics are the main objects of this study. The lead-free specimens include pure 0.93(Na1/2Bi1/2)TiO3-0.07BaTiO3 (NBT-7BT) ceramics, pure 0.91(Na1/2Bi1/2)TiO3-0.06BaTiO3-0.03K0.5Na0.5NbO3 (NBT-6BT-3KNN) ceramics, bilayer composites and trilayer “sandwich” composites based on these two pure lead-free materials. The electromechanical properties of these materials were measured by using two setups. One is designed for checking the electric field-induced strain and polarization, the other is assembled for monitoring the deformation of piezoceramics under uniaxial compression.
For the PZT samples, the deformation induced by a pure bipolar electric field and a pure compressive stress were monitored, respectively. Simultaneously, the polarization can be obtained during the electric field and compressive loadings. The digital image correlation (DIC) method was employed to monitor the deformation under larger signal electric field and stress. ... mehr

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Volltext §
DOI: 10.5445/IR/1000069350
Coverbild
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
Publikationstyp Hochschulschrift
Jahr 2017
Sprache Englisch
Identifikator urn:nbn:de:swb:90-693502
KITopen-ID: 1000069350
HGF-Programm 43.22.01 (POF III, LK 01)
Verlag KIT, Karlsruhe
Umfang XIII, 96 S.
Abschlussart Dissertation
Fakultät Fakultät für Maschinenbau (MACH)
Institut Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
Prüfungsdatum 27.04.2017
Referent/Betreuer Prof. M. Kamlah
Schlagworte DIC method, strain distribution, lead-free ceramics
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