Phase structure and electrical properties of 0.8Pb(Mg_1/3Nb_2/3)O₃–0.2PbTiO₃ relaxor ferroelectric ceramics prepared by the reaction‐sintering method

Abstract

Phase pure perovskite 0.8Pb(Mg 1/3 Nb 2/3 )O 3 -0.2PbTiO 3 (0.8PMN-0.2PT) ferroelectric (FE) ceramics were prepared by the reaction-sintering method at a sintering temperature range of 1200-1250 8C. The sintered ceramics exhibit large relative density, where the 0.8PMN-0.2PT ceramics sintered at 1250 8C possess the largest value of relative density, reaching 99.56% of the theoretical density. All the sintered 0.8PMN-0.2PT ceramics exhibit broad, diffused, and frequency-dependent dielectric response peaks at around 80 8C and saturated and symmetric P-E hysteresis loops. The 0.8PMN-0.2PT ceramics exhibit excellent electrical properties, where the value of dielectric constant maximum e m is 35 750 at 1 kHz, the remanent polarization P r is 33.01 mC/cm 2 , the coercive field E c is 2.79 kV/ cm, and the piezoelectric constant d 33 is 259 pC/N.

Preparation and Microstructural, Structural, Optical and Electro-Optical Properties of La Doped Pmn-Pt Transparent Ceramics

“…The relative density of PLMN-XP different PT concentration are greater than 96% of the theoretical density as can be seen in Figure 2, which is especially suitable for electronic industry application [14]. The relative density of the two system exhibits the tendency to decrease when PT concentration is increased.…”

Phase development and electrical properties of Pb(Mg1/3Nb2/3)O3‐PbTiO3 ceramics prepared by partial oxalate route

“…The electromechanical coupling coefficient ( K p ) and the mechanical quality factor ( Q m ) were determined by the resonance–antiresonance method using a TH2826 High Frequency LCR Meter (Changzhou Tonghui Electronic Co. Ltd., China). Detailed electrical properties measurement procedures were described elsewhere .…”

Tailoring electrical properties of (Na1/2K1/2)NbO3‐based lead‐free piezoelectric ceramics

“…For electrical properties characterization, silver paste was coated on both surfaces of the well‐polished ceramics and fired at 550 °C for 30 min to provide robust electrodes. Detailed electrical properties measurement procedures were described elsewhere 13, 14.…”

“…(Na 1 − x K x )NbO 3 exhibits typical ABO 3 ‐type perovskite structure, in which the composition of Na/K = 1/1 locates close to the morphotropic phase boundary (MPB) and exhibits a moderate dielectric constant and an optimum piezoelectric response 9, 10. With the addition of a second component in the (Na 1/2 K 1/2 )NbO 3 (NKN) system, the NKN‐based ceramics can be prepared by the conventional solid‐state reaction method without the cold‐isotactic pressing process, but also with difficulty 10–14.…”