Effect of MnO doping on the structure, microstructure and electrical properties of the (K,Na,Li)(Nb,Ta,Sb)O3 lead-free piezoceramics

Effect of CuO on dielectric and piezoelectric properties of (K0.4425Na0.52Li0.0375)(Nb0.87Ta0.06Sb0.07)O3 ceramics

“…However, these ceramics have a drawback for power device applications due to some "soft" characteristics such as very low Q m (30-50) and high tan ı [8]. Previous researches revealed that high Q m can be obtained in KNN-based piezoceramics doped with K 5.4 Cu 1.3 Ta 10 O 29 [9], MnO 2 [10,11], CuNb 2 O 6 [12] or CuO [13,14]. For example, M. Matsubara et al [9] reported that a high Q m value of 680 was achieved for 0.23 mol% K 5.4 Cu 1.3 Ta 10 O 29 -added (K 0.5 Na 0.5 )(Nb 0.7 Ta 0.3 )O 3 ceramics.…”

Mn doping effects on electric properties of 0.93(Bi0.5Na0.5)TiO3‐0.07Ba(Ti0.945Zr0.055)O3 ceramics

“…The highest d 33 obtained at x = 0.25 can be rationalized by 2 aspects. On one hand, Mn substitution has created some factors conducive to the d 33 increase, including probable donor doping effect, defect effect, and size effect . On the other hand, Mn doping results in higher ergodic degree at RT to destabilize domains.…”

“…On one hand, Mn substitution has created some factors conducive to the d 33 increase, including probable donor doping effect, defect effect, and size effect. 20,21 On the other hand, Mn doping results in higher ergodic degree at RT to destabilize domains. The appropriate decline of domain stability is beneficial for reorientation so that improves piezoelectric performance.…”

Disk-type piezoelectric transformer of a Na0.5K0.5NbO3–CuNb2O6 lead-free ceramic for driving T5 fluorescent lamp

“…Sodium potassium niobate ((Na 0.5 K 0.5 )NbO 3 , NKN) ceramic is considered to be a good candidate for lead-free piezoelectric ceramics because of its strong piezoelectricity and ferroelectricity [9]. However, it is very difficult to synthesize ceramics with a dense microstructure, so many researchers have reported the addition of (Li, Sb, Ta) compounds to NKN ceramics, to improve the densification and enhance the piezoelectric properties of the samples [10][11][12][13][14][15]. In addition, CuO, or CuO compounds serve as good dopants for enhancing the Q m value of NKN ceramics because of the formation of oxygen vacancies.…”