Effects of Zr/Ti ratio on dielectric and ferroelectric properties of 0.8Pb(ZrxTi1−x)O3–0.2Pb(Co1/3Nb2/3)O3 ceramics

Morphotropic Phase Boundary of 0.875Pb(ZrxTi1−x)O3–0.125Pb(Mg1/3Nb2/3)O3Ceramics

“…This result suggests that the transition temperature of 0.875PZT-0.125PMgN system can be varied over a range from 283 to 318 • C by controlling the Zr/Ti ratio in the system. Similar behavior is also reported in previous works [8].…”

“…There also appears coexistence between tetragonal and rhombohedral phases around Zr/Ti = 50/50, as shown in Fig 1(b). Previously, a similar behavior was also observed with increasing Zr content in PZT, PZT-PZN, PZT-PCN and PZT-SiO 2 based ceramics [8,[11][12][13]. Fig.…”

“…The maximum dielectric constant (ε max ) and transition temperature (T max ) at 1 kHz are also listed in Table 1. The ε max increases from x = 0.46 and shows maximum value at x = 0.50 and then decreases, clearly indicating the maximum dielectric constant at MPB composition of x = 0.50 [8,14]. In addition, a clear transition in T max (defined as the temperature at which ε r is maximum at 1 kHz) is observed.…”

“…The calcined powders were uniaxially cold-pressed at 5000 psi into disc-shaped pellets with a diameter of 10 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 1200 • C for 2 h at a heating/cooling rate of 5 • C/min [7,8].…”

Dielectric properties of lead-free solid solution of Bi0.487Na0.487La0.017TiO3and BaTiO3

“…Furthermore, the ferroelectric characteristics can be assessed with the hysteresis loop squareness (R sq ) [11], which can be calculated from the empirical expression R sq ¼ (P r /P s ) þ (P 1.1Ec /P s ), where P s is the saturated polarization obtained at some finite field strength below the dielectric breakdown and P 1:1Ec the polarization at the field equal to 1.1 Ec. For the ideal square loop, R sq ¼ 2.00 [12]. As listed in Table 1, the loop squareness parameter R sq decreases when BT was added in BNLT-BT solid solution.…”