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Effect of Ti on the properties of (KxNa1-x)NbO3 based lead-free ceramics
Publikationstyp
Journal Article
Date Issued
2015-07-26
Sprache
English
Author(s)
TORE-URI
Journal
Volume
41
Issue
10
Start Page
13232
End Page
13240
Citation
Ceramics International 10, Part A (41): 13232-13240 (2015)
Publisher DOI
Scopus ID
Publisher
Elsevier Science
The effect of modifying lead-free alkaline niobate based piezoelectric ceramics with different amounts of Ti has been investigated. Thermal studies using a dilatometer show that increasing Ti amount leads to decreasing sintering temperature by approximately 11.7 °C for every 1 mol% of the dopant added. Chemical analysis on the ceramics reveals that the measured amounts of the alkali elements are slightly lower while small amounts of Zr were introduced to the ceramic through the milling process. Microstructural analysis shows that that the average grain size decreases with increasing dopant amount and that new, smaller sized grains are formed in the presence of Ti. Two-phase orthorhombic-tetragonal diffraction patterns are observed using synchrotron X-ray diffraction while the analysis using Rietveld refinement shows that the fraction of the tetragonal phase in the two-phase patterns increase with increasing Ti content. The dielectric, piezoelectric coefficient values and ferroelectric properties of the ceramics decrease with increasing Ti amount. The current density values in the samples increase by up to 5 orders of magnitude when more than 0.5 mol% of the dopant is added.
Subjects
Ferroelectrics
Lead-free ceramics
Rietveld refinement
Synchrotron X-ray diffraction
DDC Class
600: Technik
More Funding Information
Financial support from the Deutsche Forschungsgemeinschaft (DFG) under the Grant: SCHN 372/16-2 .