Crystals
·
2020
·Vol. 10
·期 8
·705
·
IF 2.404
Yunfeng Deng,Junjun Wang,Chunxiao Zhang,Hui Ma,Chungeng Bai,Danqing Liu,Fengmin Wu,Bin Yang
Structural, ferroelectric, dielectric, and piezoelectric properties of K0.5Na0.5NbO3-LiTaO3-xmol%MnO2lead-free piezoelectric ceramics with 0.0 ≤x≤ 0.3 were studied. The ceramic samples were synthesized through the conventional solid-state reaction method. The MnO2addition can reduce the sintering temperature of KNLNT ceramics. Compared with undoped KNLNT ceramic, the piezoelectric measurements showed that piezoelectric properties of K0.5Na0.5NbO3-LiTaO3-xMnO2were improved (d33= 251 pC/N) whenx= 0.1. In addition, KNLNT-xMnO2ceramics have largerPr(20.59~21.97 μC/cm2) and smallerEc(10.77~6.95 kV/cm), which indicates MnO2has excellent softening property, which improves the ferroelectric properties of KNLNT ceramics This work adds relevant information regarding of potassium sodium niobate K0.5Na0.5NbO3(KNN) when doped Li, Ta, Mn at the B-site.Keywords:KNLNT ceramics;MnO2doped;ferroelectricity;piezoelectricity
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Huajun Sun,Saihong Duan,Xiaofang Liu,Dawei Wang,Huiting Sui
Lead-free Ba 0.98 Ca 0.02 Zr 0.02 Ti 0.98 O 3 -xmol% MnO 2 (BCZT-xMn) (x = 0.1, 0.2, 0.3, 0.4, 0.5) ceramics were prepared by conventional solid-state reaction method and the effects of MnO 2 doping content and sintering temperature on microstructure and electrical properties of BCZT ceramics were studied. The ceramics samples with all MnO 2 doping contents exhibit pure perovskite structure and similar Curie temperature of approximately 120 °C. Among all, the sample with 0.3 mol. % MnO 2 doping content sintered at 1400 °C exhibits improved ferroelectricity with a relatively high remnant polarization ( P r ) and low coercive electric field ( E c ) of 15.7 μC/cm 2 and 180 V/mm, respectively, which can be attributed to the fact that an appropriate doping content of MnO 2 does favor to the grain growth, with the favorable effect on domain motion. Accordingly, excellent piezoelectric property with piezoelectric coefficient ( d 33 ) of 308 pC/N can be obtained. Besides, the sample shows a relatively low dielectric loss (tanδ) of 1.04%. As a result, the BCZT-xMn ceramic exhibits the potential to be used in memory and transformer applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 20
·18950-18958
·
IF 2.195
Fu Mingtao,Li Caixia,Yang Bin,Liu Danqing,Bian Lang,Hong Yuenan,Zhang Changhai,Chen Chuntian,Lin Jiaqi
The Ba 0.985 Ca 0.005 Ti 0.98 Sn 0.02 O 3 + x mol% MnO 2 (BCTSM x , x = 0, 0.2, 0.3, 0.4, 0.5 and 0.6) ceramics were fabricated by conventional solid-state reaction method. The effects of MnO 2 doping on the phase structure, microstructure, dielectric, ferroelectric and piezoelectric properties of Ba 0.985 Ca 0.005 Ti 0.98 Sn 0.02 O 3 ceramics were investigated systematically. X-ray diffraction patterns revealed that the BCTSM x ceramics are composed of coexisting tetragonal-orthogonal phases. The addition of MnO 2 could significantly improve the sinterability of BCTS ceramics. The BCTSM x ceramics with x = 0.4 demonstrated an optimum electrical properties: ε r = 2802, tan δ = 0.081, T C = 121 °C, ε max = 9977, P r = 11.8 μC/cm 2 , E C = 2.6 kV/cm, bipolar S max = 0.25%, unipolar S max = 0.28%, d
* 33
= 1093 pm/V, d 33 = 325 pC/N, k p = 43.2%, and Q m = 118.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Yan Yu,Weijia Guo,Yichao Zhen,Zhenyong Cen,An Ji,Hao Wu,Shujian Liang,Shan Xiong,Xiaohui Wang
The increasing cost of palladium has demonstrated the significant value of using inexpensive base metals as inner electrodes for RF/microwave multilayer ceramic capacitors . However, solving the co-sintering problem of dielectric ceramics with base metals such as copper is highly challenging, as sintering in a reducing atmosphere is required to prevent the oxidation of the base metals. In this work, the feasibility of sintering nonreducible MnO 2 -doped 0.95MgTiO 3 -0.05CaTiO 3 (95MCT) ceramics in a reducing atmosphere (H 2 -N 2 , p O 2 = 1 × 10 − 10 ∼ 1 × 10 − 11 MPa) at 1000 °C was investigated. The effects of the MnO 2 additive (1.6–2.4 mol%) on the phase structures, dielectric properties , and thermal stability were studied. Thermally stimulated depolarization current (TSDC) analysis and X-ray photoelectron spectroscopy (XPS) were conducted to characterize the oxygen vacancies and Mn ion valence state in MnO 2 -doped ceramics, indicating that Mn plays an important role in the dielectric properties, especially the extrinsic dielectric loss. With the optimized addition of 2.0 mol% MnO 2 , due to the decrease in oxygen vacancy concentration, the samples with ε r = 20.22 exhibited the attractive properties of a high insulation resistivity of IR = 3.65 × 10 14 Ω ∙ cm and a low dielectric loss of tan δ = 0.036 % , meeting the C0G specifications. The results show that the 2.0 mol% MnO 2 -doped 0.95MgTiO 3 -0.05CaTiO 3 ceramic is an outstanding nonreducible dielectric material for base-metal electrode RF/microwave multilayer ceramic capacitor applications with low cost, excellent dielectric properties, and high reliability.
研究领域:
材料科学
·
电子工程
✓ 已验证
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
危险品化学品经营许可证（带存储）