Pyroelectric, dielectric, and piezoelectric properties of MnO2-doped (Na0.82 K0.18)0.5Bi0.5TiO3 lead-free ceramics

Abstract

MnO 2 doped (Na 0.82 K 0.18 ) 0.5 Bi 0.5 TiO 3 lead-free piezoelectric ceramics were prepared by conventional solidstate reaction process and the effect of MnO 2 addition on the pyroelectric, piezoelectric and dielectric properties were studied. The experiment results showed that the pyroelectric, piezoelectric, and dielectric properties strongly depended on MnO 2 addition in the (Na 0.82 K 0.18 ) 0.5 Bi 0.5 TiO 3 ceramics. Excellent electrical properties were obtained in (Na 0.82 K 0.18 ) 0.5 Bi 0.5 TiO 3 with 0.8 mol% MnO 2 . The large dielectric loss of pure BNT ceramics was significantly reduced, the piezoelectric constant was improved, and it also showed excellent pyroelectric properties when compared with other lead free ceramics, with pyroelectric coefficient p 017 × 10 −4 C/m 2 K and figure of merit F d 06.56×10 −5 Pa −0.5 . With these outstanding pyroelectric properties, the 0.8 mol% MnO 2 doped (Na 0.82 K 0.18 ) 0.5 Bi 0.5 TiO 3 ceramic can be a promising material for pyroelectric sensor applications in future.

Enhanced pyroelectric property in (1−x)(Bi0.5Na0.5)TiO3-xBa(Zr0.055Ti0.945)O3: Role of morphotropic phase boundary and ferroelectric-antiferroelectric phase transition

“…These values are about 8 times higher than that of MnO 2 doped BNBT-6 and 13 times higher than that of BNKT-18 ceramics near 80 C ($T d ). 10,21 The high pyroelectric coefficient of the MPB composition in a wide temperature range from RT to T d can be explained as the following: at lower temperatures, the pyroelectric coefficient mainly arises from ferroelectric domain reorientation and the MPB plays a positive role in improving the pyroelectric property. When the temperature increases from RT to T d , the effect of phase transition increases.…”

Microstructure, electrical properties of Bi2NiMnO6-doped 0.935(Bi1/2Na1/2) TiO3–0.065BaTiO3 lead-free piezoelectric ceramics

“…Besides, the excess BNMO may precipitate in the grain boundary, which may lead to the accumulation of space charges, thus limiting the movement of the domains [39,40]. Both of these effects lead to the deterioration of the piezoelectric properties [41].…”

Manifestations of Nanomaterials in Development of Advanced Sensors for Defense Applications

“…In the past, numerous studies have been done on materials such as ceramics and polymers. Traditional ceramics (BaTiO 3 and PbTiO 3 ) possess high dielectric constant, but their processing routes, brittleness, and low dielectric strength restricted their usage [30][31][32]. On the other hand, polymers having numerous merits like easy processing, flexibility, high dielectric breakdown strength, but their low dielectric constant restricted the application.…”