Textured CaBi4Ti4O15 ceramics with large piezoelectricity, excellent thermal stability and high resistivity

Decoding intrinsic and extrinsic contributions for high piezoelectricity of CBT-based piezoelectric ceramics

“…5c, the ρ of CBTNM-1000 x ceramics increases from 3.5 × 10 10 Ω cm to 7.9 × 10 10 Ω cm at 200 °C, while the change is not obvious at 500 °C with the ρ of the ceramics increasing from 1.0 × 10 7 Ω cm to 1.4 × 10 7 Ω cm. The dc conduction mechanism of CBTNM-1000 x ceramics can be further studied by the Arrhenius equation, as follows: 11,27 where ρ 0 and E cond represent the pre-exponential factor and the activation energy of thermally activated dc conduction process ( E cond ), respectively; k B and T are the Boltzmann constant and the environment temperature, respectively. The fitting results of E cond are shown in Fig.…”

“…5c, the r of CBTNM-1000x ceramics increases from 3.5 Â 10 10 O cm to 7.9 Â 10 10 O cm at 200 1C, while the change is not obvious at 500 1C with the r of the ceramics increasing from 1.0 Â 10 7 O cm to 1.4 Â 10 7 O cm. The dc conduction mechanism of CBTNM-1000x ceramics can be further studied by the Arrhenius equation, as follows: 11,27…”

“…At present, studies on CBT ceramics mainly focus on the following three research directions: (i) improving T C to achieve applications at a higher temperature, (ii) reducing the coercive field ( E c ) and increasing the breakdown dielectric field to make the ceramics more fully polarized, and (iii) decreasing the concentration of oxygen vacancies to improve resistivity. Guo Li et al 11 synthesized highly textured CBT ceramics using a spark plasma sintering technique and obtained enhanced electrical properties ( d 33 = 24.2 pC/N and T C = 788 °C). Jing Xi et al 12 revealed that the sintering temperature of Ca 0.85 (LiCe) 0.075 Bi 4 TiO 15 ceramics decreases to 980 °C by Zn doping, suppressing the formation of oxygen vacancies and improving the resistivity ( ρ = 6.32 × 10 5 Ω cm at 600 °C).…”

3D printing of CaBi4Ti3.925(Nb2/3Mn1/3)0.075O15 ceramics for high temperature ultrasound transducer

“…There are various methods to improve the performance of CBT ceramics. The textured CBT were prepared with an increased piezoelectric constant (d 33 ∼ 25.3 pC/N) using spark plasma sintering technique [8]. Besides, ion doping is effective at enhancing the piezoelectric properties of CBT ceramics.…”

Electromechanical Performance Optimization of Ni-Doped Bi(Sc, Zr)O3–PbTiO3 Ceramics and Microstructure Analysis

“…It is urgent to develop piezoelectric materials with higher T C and excellent electrical properties. Bismuth layer-structured ceramics, such as Bi 4 Ti 3 O 12 , CaBi 2 Nb 2 O 9 , and CaBi 4 Ti 4 O 15 , show an ultrahigh T C of >650 °C. − However, their piezoelectric activities are maintained at a low level ( d 33 < 50 pC/N). For example, Liu et al improved the piezoelectric performance of CaBi 4 Ti 4 O 15 ceramics by the Ta–Mn codoping, leading to a d 33 of 24 pC/N and T C of 793 °C.…”