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Han, Hyoung-Su,Koruza, Jurij,Patterson, Eric A.,Schultheiß, Jan,Erdem, Emre,Jo, Wook,Lee, Jae-Shin,Rö,del, Jü,rgen Elsevier Science Publishers 2017 Journal of the European Ceramic Society Vol. No.
<P><B>Abstract</B></P> <P>This paper relates the microstructure, crystallographic structure, ferroelectric, and piezoelectric properties of (K<SUB>0.5</SUB>Na<SUB>0.5</SUB>)NbO<SUB>3</SUB> (KNN) ceramics modified with 0.38mol% K<SUB>5.4</SUB>Cu<SUB>1.3</SUB>Ta<SUB>10</SUB>O<SUB>29</SUB> (KCT) and different amounts of CuO. Results revealed that the addition of KCT and CuO were effective in enhancing the sinterability of KNN. The internal bias field (<I>E</I> <SUB>ib</SUB>) increased from 0.3kV/mm to 0.58kV/mm at 0.5mol% CuO–added KNN+KCT ceramics. The increase of <I>E</I> <SUB>ib</SUB> corresponds very well with the observed increase of the mechanical quality factor (<I>Q</I> <SUB>m</SUB>) from 112 to 2665 for 0.5mol% CuO. Besides, addition of 0.5mol% CuO to KNN+KCT resulted in a large increase of the EPR signal, which is related to the increased amount Cu<SUP>2+</SUP> and a corresponding increase of the concentration of defect dipoles. This result is in good agreement with the increased <I>E</I> <SUB>ib</SUB> and the resulting hardening behavior.</P>