Dielectric and Piezoelectric Properties of Low-Temperature-Sintering Pb(Mg_1/2W_1/2)O₃-Pb(Ni_1/3Nb_2/3)O₃-Pb(Zr,Ti)O₃ Ceramics for Multilayer Piezoelectric Actuator

Abstract

In this study, in order to develop low-temperature-sintering ceramics for a multilayer piezoelectric actuator, Pb(Mg1/2W1/2)O3-Pb(Ni1/3Nb2/3)O3-Pb(Zr,Ti)O3 (PMW-PNN-PZT) ceramics were fabricated using Li2CO3 and CaCO3 as sintering aids and their dielectric and piezoelectric properties were investigated in relation to the amount of Bi substitution. Piezoelectric actuators require both a high piezoelectric constant (d 33) and a high electromechanical coupling factor (kp). Accordingly, in this study, Bi was substituted at the Pb site of basic composition PMW-PNN-PZT ceramics for the enhancement of kp and d 33. With increasing Bi substitution, density gradually increased. At the sintering temperature of 900°C, the electromechanical coupling factor (kp) and piezoelectric constant (d 33) of PMW-PNN-PZT composition ceramics with 1.0 mol % Bi substitution as well as 0.2 wt % Li2CO3 and 0.25 wt % CaCO3 showed the optimal value of 0.618 and 473 pC/N, respectively, for multilayer piezoelectric actuator application.

Effects of CuO addition on the electrical responses of the low-temperature sintered Pb(Zr0.52Ti0.48)O3–Pb(Mg1/3Nb2/3)O3–Pb(Zn1/3Nb2/3)O3 ceramics

“…The increases of lead vacancies could generate electrons by ionization; most of the holes from lead vacancies are compensated by electrons from the donor level to make resistivity of PZT increased with the addition of donor dopant. As a result of higher resistivity, PZT based ceramics are easily poled to facilitate the domain motion reoriented [6,23]. Whereas, from the ionic radii point of view, ionic radius of Pb 2+ ion is larger than Li + .…”

“…In multilayered piezoelectric high-power devices, it is widely recognized that the materials should exhibit high electromechanical coupling factor (k p ) and electromechanical quality factor (Q m ) in order to increase the efficiency of energy conversion between electrical and mechanical energy and to minimize the temperature rise during operation [4,5]. At the same time, it is necessary to lower the sintering temperature of materials in order to co-fire the ceramics with the inter electrode, to compensate for the deteriorated piezoelectric properties of the multilayer piezoelectric devices and to reduce the amount of expensive palladium electrode [6,7].…”

The study of dielectric, pyroelectric and piezoelectric properties on hot pressed PZT-PMN systems

“…14 found to be superior to that of parent system. 6 There have been numerous studies on the Mn doping in the PZT system as well.…”

Piezoelectric Properties of Pb0.98Bi0.02Zr0.51Ti0.48Zn0.01O3 Ceramics

“…First, the low-melting point glass such as CdO-SiO 2 -MnO 2 , B 2 O 3 -Bi 2 O 3 -CdO was adapted to decrease the sintering temperature of piezoceramics. [6][7][8][9][10] Second, the oxide such as CuO, V 2 O 5 to form eutectic compound with some component of PZT was also demonstrated effective to decrease sintering temperature below 900 C. [11][12][13] However, these heterogeneous liquid phase method usually deteriorate piezoelectric properties due to the non-piezoelectric additives, which accumulates at the grain boundaries of ceramics after sintering. In order to improve piezoelectric performance while decreasing sintering temperature, the homogeneous technique using ionic species resembling the original composition has been adapted recently, e.g., PbO, MgO, NiO, and/or ZnO used as low temperature sintering (LTS) additives for Pb(Ni 1=3 Nb 2=3 )O 3 -PbTiO 3 -PbZrO 3 ternary solid solution ceramics, of which the additive could diffuse into the structural lattice of piezoceramics.…”