Synthesis and Dielectric and Ferroelectric Properties of Ceramics in (1-x)Pb(Zr_1/2Ti_1/2)O₃–(x)Pb(Co_1/3Nb_2/3)O₃ System

Abstract

Ceramics in a PZT-PCN system with the formula (1 À x)Pb(Zr 1=2 Ti 1=2 )O 3 -(x)Pb(Co 1=3 Nb 2=3 )O 3 , where x ¼ 0:1{ 0:5, were prepared using a solid-state mixed-oxide technique (the columbite-wolframite precursor method). The phase formation behavior and microstructure were studied using X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM), respectively. The dielectric and ferroelectric properties of the compounds were studied and discussed. Phase-pure perovskites of PZT-PCN ceramics were obtained over a wide compositional range. In addition, the XRD, dielectric, and ferroelectric properties confirmed that the morphotropic phase boundary (MPB) composition between the tetragonal and pseudo cubic phases of this system lied between 0:2 x 0:3.

Synthesis and Dielectric Properties of 0.9Pb(Zr1/2Ti1/2)O3– 0.1Pb(Fe1/3Nb2/3)O3Ceramics

“…1PFN has been affected on the phase formation of PZT ceramic. This trend is similar to those reported in the literature [6,7,12,13].…”

“…However, the single phase presents only a composition of x = 0.1, while the compositions x ≥ 0.2 have many secondary phase. In the present work, the (1 − x)Pb(Zr 1/2 Ti 1/2 )O 3 −(x)Pb(Fe 1/3 Nb 2/3 )O 3 composition was prepared and synthesized by the solid-state reaction of these raw materials and mixed by vibratory-milling technique in ethanol for 6 h. After drying, the product was calcined in an alumina crucible at a temperature of 900 • C with a heating/cooling rate 5 • C/min [6]. The calcined powders were uniaxially cold-pressed at 2.5 tons into disc-shaped pellets with a diameter of 12.7 mm and a thickness of 1 mm, with 3 wt% poly (vinyl alcohol) (PVA) added as a binder.…”

“…The calcined powders were uniaxially cold-pressed at 2.5 tons into disc-shaped pellets with a diameter of 12.7 mm and a thickness of 1 mm, with 3 wt% poly (vinyl alcohol) (PVA) added as a binder. Following binder burnout at 500 • C, the pellets were sintered at 1100 • C for 2 h at a heating/cooling rate of 5 • C/min [6].…”

“…Most commercial PZT ceramics are designed in the vicinity of the MPB with various doping methods in order to achieve high properties. Recently, many piezoelectric ceramic materials have been developed from binary systems containing a combination of relaxor and normal ferroelectric materials [5] that yield high dielectric permittivities {e.g., PZT−PNN, PZT−PCN, and PZT−PMN} [6][7][8], excellent piezoelectric coefficients {e.g., PZT−PZN} [9], and high pyroelectric coefficients {e.g., PNN−PT−PZ} [10].…”

Effect of KNbO3 on physical and electrical properties of lead-free BaTiO3 ceramic

“…It is known that oxygen vacancies are the main cause of domain wall clamping which leads to the reduction of dielectric constant [25,[34][35]. The tanG of KN doped BT ceramics is lower than that of pure BT ceramics.…”