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Investigation of the structure and electrical properties of (KxNa0.96-xLi0.04)(Nb0.96-yTaySb0.04) O3 piezoelectric ceramics modified with manganese
Publikationstyp
Journal Article
Date Issued
2012-10-16
Sprache
English
Volume
96
Issue
1
Start Page
201
End Page
208
Citation
Journal of the American Ceramic Society 96 (1): 201-208 (2013)
Publisher DOI
Scopus ID
Publisher
Wiley-Blackwell
The effect of high doping levels of manganese (Mn) on the structure and electrical properties of (KxNa1-x)NbO3 (KNN) ceramics containing Li, Ta, and Sb has been investigated. The samples were measured using synchrotron X-ray diffraction whereas Rietveld refinement with Fullprof was used to determine the structural information as a function of temperature. Temperature-dependent dielectric measurement was used to compare the phase transition temperatures. The results show that Mn decreases the temperature range of phase coexistence between the orthorhombic and tetragonal phase from ~180°C to ~120°C. The Curie temperature remained unchanged with Mn addition while the dielectric constant and dielectric loss increased with Mn addition. High amounts of Mn led to a reduction in both piezoelectric and ferroelectric properties. The remnant polarization, remnant strain, and piezoelectric coefficient values decreased from 24 μC/cm2, 0.000824, 338 ± 37 pm/V to 13 μC/cm2, 0,00014 and 208 ± 27 pm/V, respectively for the undoped and 5 mol% Mn-doped sample. © 2012 The American Ceramic Society.
DDC Class
540: Chemie