Highly enhanced mechanical quality factor in lead-free (K0.5Na0.5)NbO3 piezoelectric ceramics by co-doping with K5.4Cu1.3Ta10O29 and CuO

Structural dependence of piezoelectric, dielectric and ferroelectric properties of K0.5Na0.5(Nb1−2/5Cu )O3 lead-free ceramics with high Q

“…1(c). However, we should not exclude the possibility of the incorporation of Cu 2+ onto A-site due to the volatility of K and Na [8], which could also decreased the unit-cell volume since the ionic radius of Cu 2+ is smaller than K + and Na + (1.52 and 1.16 Å for K + and Na + , respectively) [12].…”

Microstructure and piezoelectric properties of CuO-doped 0.95(K0.5Na0.5)NbO3–0.05Li(Nb0.5Sb0.5)O3 lead-free ceramics

“…Notable improvement (twice more than those of undoped ceramics) in mechanical quality was achieved at x = 0.006 and the maximum value of Q m = 170.9 was obtained; however, this result is not as notable as in the KNN case. 15,24 The slight change of tan δ can be interpreted by the change of the microstructure of the KNN-5LNS-xCu. The denser the microstructure, and the lower the values of tan δ are.…”

“…[13][14][15][16][17] Studies have suggested that employing the Sb 5+ ion could increase the ferroelectricity of the KNN-based ceramics. 18 Therefore, in this work, Sb 5+ ions were added in the CuO doped KNN-LN ceramics to maintain the piezoelectricity of the KNN-based ceramics.…”

Development of KNN-Based Piezoelectric Materials

“…In a recent report, Eichel et al have performed multi-frequency and multi-pulse electron paramagnetic resonance (EPR) spectroscopy on Cu-doped KNN system and confirmed the substitution of Cu 2+ on B-site as acceptor [64]. Park et al have reported enhanced Q m~3 ,053 in KNN ceramics by co-doping of KCT and CuO [65].…”