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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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Effect of Nb-donor and Fe-acceptor dopants in (Bi1/2Na1/2)TiO3-BaTiO3-(K0.5Na0.5)NbO3 lead-free piezoceramics

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Title
Effect of Nb-donor and Fe-acceptor dopants in (Bi1/2Na1/2)TiO3-BaTiO3-(K0.5Na0.5)NbO3 lead-free piezoceramics
Author
Jo, WookErdem, EmreEichel, Ruediger-AGlaum, JuliaGranzow, TorstenDamjanovic, DraganRoedel, Juergen
Keywords
Acceptor dopants; Acceptor doping; Cubic symmetry; Defect dipoles; Donor dopants; Electrical property; Electron paramagnetic resonance; Fe doping; Ferroelectric order; Lattice expansion; Lead free piezoceramics; Nb doping; Polarization characteristics; TiO
Issue Date
2010-07
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.108, no.1, pp. -
Abstract
The role of Fe as an acceptor and Nb as a donor in [0.94-x](Bi1/2Na1/2)TiO3-0.06BaTiO(3)-x (K0.5Na0.5)NbO3 (100xKNN) (x=0.02 and 0.03) lead-free piezoceramics was investigated. X-ray diffraction analyses show that all the profiles are best-fitted with a cubic symmetry where Fe doping tends to induce a lattice expansion, while Nb doping does the opposite. The strain and polarization characteristics are enhanced and suppressed by the acceptor and donor dopants, respectively. The improvement in the electrical properties with acceptor doping is accompanied by the stabilization of a ferroelectric order. Electron paramagnetic resonance spectroscopic analysis suggests that the stabilization of the ferroelectric order by the Fe dopant originates from the formation of (Fe-Ti'-V-O(center dot center dot))(center dot) defect dipoles.
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DOI
10.1063/1.3437645
ISSN
0021-8979
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MSE_Journal Papers
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