Microstructural, Electrical Properties and Temperature Stability of Resonant Frequency in Pb(Ni_1/2W_1/2)O₃–Pb(Mn_1/3Nb_2/3)O₃–Pb(Zr, Ti)O₃ Ceramics for High-Power Piezoelectric Transformer

Abstract

Piezoelectric properties of Pb1-a Sr a (Ni1/2W1/2)0.02(Mn1/3Nb2/3) b (Zr x , Ti y )1-0.02-b O3) ceramics, to which 0.5 wt% PbO, 0.3 wt% Fe2O3 and 0.25 wt% CeO2 were added, were investigated at different compositions of a=0–0.06, b=0.05–0.09, x=0.49–0.51, and y=0.49–0.51. In the ceramics with a constant composition of a=0 and b=0.07, mechanical quality factor, coercive field and Curie temperature increased with the decrease in Zr/Ti ratio due to the increase in tetragonality. With the increase of PMN mol% at a=0, x=0.51, and y=0.49 composition, grain size decreased and coercive field increased. At the composition of b=0.07, x=0.51, and y=0.49, the dielectric constant and mechanical quality factor increased while the Curie temperature and coercive field decreased with the amount of Sr. Taking into consideration the dielectric constant of 1,680, the mechanical quality factor of 1,814, and the temperature stability of the resonant frequency TCfr of 88, it was concluded that the ceramics with the composition of a=0.06, b=0.07, x=0.51, and y=0.49 were best for the high-power piezoelectric transformer application.

Structure and Dielectric Relaxation Behaviour of [Pb<sub>0.94</sub>Sr<sub>0.06</sub>][(Mn<sub>1/3</sub>Sb<sub>2/3</sub>)<sub>0.05</sub> (Zr<sub>0.49</sub>Ti<sub>0.51</sub>)<sub>0.95</sub>]O<sub>3</sub> Ceramics

“…The perovskite lead zirconate titanate Pb (Zr x Ti 1−x )O 3 abbreviated as PZT is known to have excellent piezoelectric properties and used as transformers, ultrasonic motors and electromechanical transducers; it is desirable to combine high mechanical quality factor (Q m ) with large coupling factor (k p ) and low dielectric loss as well as high mechanical strength [1]- [3]. Relaxors are mainly lead-based perovskite solid solutions and exhibit a stronger piezoelectric effect, high permittivity over a broad temperature range, unique dielectric response with strong frequency dispersion, and anomalous phonon dispersion relation [4]- [6].…”

Effect of CuO on the sintering temperature and piezoelectric properties of MnO2-doped 0.75Pb(Zr0.47Ti0.53)O3–0.25Pb(Zn1/3Nb2/3)O3 ceramics

“…For multilayer devices, the sintering temperature of high power piezoelectric ceramics should be less than 900 • C to allow the use of cheap Ag metal as an electrode instead of expensive Ag-Pd metal. Pb(Zr 1−x Ti x )O 3 (PZT)-based piezoelectric materials have been used in high power devices [8][9][10][11]. In particular, Pb(Mn 1/2 Nb 2/3 )O 3 and Pb(Fe 2/3 W 1/3 )O 3 or CeO 2 additives are often used to increase the Q m value of the PZT-based materials up to 2000 [12,13].…”

Study on Pb(Mg1/3Ta2/3)O3–Pb(Mn1/3Sb2/3)O3–Pb(ZrxTi1−x)O3 high power piezoelectric ceramics near the morphotropic phase boundary

“…Piezoelectric materials used in ultrasonic motors are electrically driven to high mechanical vibration near the resonance frequencies, leading to a temperature rising and deterioration of piezoelectric properties with the increase of their vibration velocities. Therefore, piezoelectric materials are necessary to have high mechanical quality factor (Q m ) [2][3][4]. Moreover, high piezoelectric coefficient (d 33 ) and electromechanical coupling factor (k p ) are also required for high torque output and efficiency.…”