Materials Today Physics
·
2024
·
IF 10
Biao Zhang,Liming Quan,Zhihong Luo,Qiantong Li,Jianming Deng,Shuhang Yu,Wangxin Li,Mingmei Lin,Feng Yan,Dawei Wang,Dongyan Yu,Changbai Long,Laijun Liu
CaBi 2 Nb 2 O 9 (CBNO) ceramics exhibit significant potential in the development of piezoelectric sensors suitable for extreme environments such as aerospace, metallurgy, and nuclear power plants. While previous studies have enhanced the piezoelectric response of CBNO ceramics, their insulating properties at high temperatures still require improvement. In this work, co-substitution of (Li 0.5 Bi 0.5 ) at A site and Mn at B site was designed to improve the electrical properties of CBNO ceramics. Defect dipoles induced by the bound between Mn and oxygen vacancies restrict the movement of oxygen vacancies at high temperatures. Meanwhile, co-substitution of Ca by (Li 0.5 Bi 0.5 ) reduces both the sintering temperature and volatilization of Bi 2 O 3 during the sintering process. This modification results in an ultra-high T C of 928 °C and an exceptional resistivity of 2.85 MΩ cm at 600 °C for Ca 0.96 (Li 0.5 Bi 0.5 ) 0.04 Bi 2 Nb 1.98 Mn 0.02 O 9 ceramics. Furthermore, the ceramic exhibits excellent piezoelectric properties ( d 33 of 15.2 pC/N and k p of 6.9 %), ferroelectric properties ( P r of 9.42 μC/cm 2 ), and thermal stability (degeneration of d 33 only 6 % after annealing at 900 °C for 2 h). This work offers a practical strategy for simultaneously achieving both a high piezoelectric response and outstanding insulating properties in the CBNO system.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2025
·
IF 4.7
Meng-si WANG,Yan ZHANG,Xiao-gang LUO,Lin TANG,Shan XIANG,Ru GUO,Xue-fan ZHOU,Ke-chao ZHOU,Dou ZHANG
MnO 2 -doped Ca 0.97 Bi 2.03 Nb 2 O 9 ceramics with greatly improved piezoelectric performance were prepared via conventional solid state sintering method. The effects of MnO 2 doping on the microstructure and electrical properties of Ca 0.97 Bi 2.03 Nb 2 O 9 ceramics were studied. X-ray diffraction (XRD) analysis and Rietveld refinement revealed a reduction in orthorhombicity with MnO 2 doping, which contributed to the enhancement of the piezoelectric properties. Furthermore, the introduction of MnO 2 lowered the sintering temperature, thereby reducing the formation of oxygen vacancies in the ceramic. The optimal performance was achieved in the Ca 0.97 Bi 2.03 Nb 2 O 9 −0.3wt.%MnO 2 sample, exhibiting a piezoelectric coefficient ( d 33 ) of 13.6 pC/N, a DC resistivity of 3×10 6 Ω·cm at 500 °C, and a Curie temperature of 965 °C. Additionally, all doped samples demonstrated excellent thermal stability over a wide temperature range, from room temperature to 900 °C.
研究领域:
材料科学
·
固态物理
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tianbao Xie,Rongxia Huang,Junhui Tan,Yan ning Luo,Hua-Tay Lin,Yejing Dai
CaBi 2 Nb 2 O 9 (CBN) is a bismuth layered ferroelectric material with extremely high Curie temperature and low dielectric loss, which has great application potential in ultra-high temperature field. However, because of its low piezoelectric coefficient, its practical application still faces great challenges. This study successfully prepared Ca 1-x Ce x Bi 2 Nb 1.98 (W 2/3 Mn 1/3 ) 0.02 O 9 ( x = 0–0.05) two-layer ferroelectric ceramics using direct-reaction sintering method. A pseudo tetragonal structure was successfully constructed near x = 0.02 using the substitution method of Ce 4+ at site A, and W 6+ and Mn 4+ at site B, which altered the crystal structure of CBN based ceramics. The properties of CBN-based piezoelectric ceramics have been significantly improved by this modification. It has a higher piezoelectric constant ( d 33 = 20.6 pC/N) and Curie temperature ( T c = 950 °C), while having a lower dielectric loss (tan δ = 0.031 at 500 °C). In addition, CaBi 2 Nb 2 O 9 based piezoelectric ceramics also show excellent thermal stability. After annealing at 900 °C for 2 h, the d 33 value remained high at 19.2 pC/N, retaining about 93.2% of its original value. Therefore, these findings indicate that Ca 1-x Ce x Bi 2 Nb 1.98 (W 2/3 Mn 1/3 ) 0.02 O 9 is a high-temperature piezoelectric material with great potential.
研究领域:
材料科学
·
无机非金属材料
·
高温压电材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junhui Tan,Rongxia Huang,Hua-Tay Lin,Kai Liu,Tianbao Xie,Yejing Dai
CaBi 2 Nb 2 O 9 (CBN) with the Aurivillius phase has a high Curie temperature ( T C ) and remarkable fatigue resistance , which has great potential for application as high-temperature sensors. However, due to its low piezoelectric properties , its practical application remains a great challenge. In this paper, Ca 1- x Ce x Bi 2 Nb 2 O 9 ceramics were prepared by the direct reaction sintering (DRS) and conventional preparation (CP) methods, respectively. The experimental results indicate that Ce doping can increase the piezoelectric coefficient d 33 of CBN ceramics by about two times. Among them, the grain size of the samples prepared by the DRS method is finer and more uniform, and the d 33 value of DRS samples is about 3.6–9.4 % higher than that of CP samples. The DRS sample Ca 0·97 Ce 0·03 Bi 2 Nb 2 O 9 has a d 33 value of 18.9 pC/N, a T C of 948 °C, and a resistivity of 1.1 × 10 5 Ω cm at 600 °C. This study shows that DRS method is an effective densification method, which can prepare CBN-based ceramics with excellent comprehensive properties, and provides an innovative preparation route to explore CBN-based ceramics with excellent piezoelectric properties.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）