共查询到18条相似文献,搜索用时 940 毫秒
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综述了无铅压电陶瓷研究开发的相关进展,着重介绍了BaTiO3基无铅压电陶瓷、Bi1/2Na1/2TiO3(BNT)基无铅压电陶瓷、NaNbO3基无铅压电陶瓷、铋层状结构无铅压电陶瓷及钨青铜结构无铅压电陶瓷等不同陶瓷种类的相关体系、制备方法及压电铁电性能,并对其应用及发展前景进行了展望。 相似文献
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无铅压电陶瓷的开发与应用是当今压电陶瓷发展的必然趋势,本文综合分析了无铅压电陶瓷的研究背景,给出了钙钛矿型无铅压电陶瓷的主要体系,包括钛酸钡基无铅压电陶瓷、BNT基无铅压电陶瓷,分析比较了其性能及研究现状。 相似文献
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利用常规烧结方法制备出了多种A位离子掺杂的钛酸铋纳[(Bi1/2Na1/2)TiO3,BNT]无铅压电陶瓷.对BNT基陶瓷的电学性能和力学性能进行了研究.在(1-x)(Bi1/2Na1/2)0.900Ba0.088Sr0.012TiO3-x(Bi1/2K1/2)TiO3(x=0-0.14)陶瓷体系中,当x=0.10时,可获得最大压电常数(168pC/N).在1 kHz,这种陶瓷的介电常数、介电损耗和平面机电耦合系数分别为1 221,0.0361和0.2281.Curie温度随x的增加先增加,当x=0.12时,达到最高值(300℃),随后,当x值进一步增加,Curie温度降低.该种无铅压电陶瓷的Vickers硬度和断裂韧性分别为5.0GPa和2.0MP·m1/2,均高于Pb(Zr,Ti)O3陶瓷. 相似文献
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Jean-François Trelcat Sophie d’AstorgChristian Courtois Philippe ChampagneMohamed Rguiti Anne Leriche 《Journal of the European Ceramic Society》2011,31(11):1997-2004
The Bi0.5Na0.5TiO3 perovskite (BNT) is a very promising lead-free candidate for piezoelectric applications. Nevertheless a low reproducibility is commonly reported for the solid state synthesized BNT. In this work, the hydrothermal synthesis was investigated to improve the BNT ceramics characteristics reproducibility. The synthesis conditions were studied in order to control more particularly the BNT grain size, crystallinity and stoichiometry.Thanks to the slow hydrolysis of titanium isopropoxide with bismuth nitrate pentahydrate, well crystallized BNT-based powder was synthesized at 265 °C. Nevertheless this powder exhibited secondary amorphous phases. Such secondary phases synthesis was limited and prevented by both lowering the temperature synthesis down to 160 °C and optimizing the washing conditions of the powder. The BNT was finally made free of any amorphous phase by using a hydrochloric solution. The BNT sinterability was improved and BNT-based piezoceramics exhibiting a d33 as high as 60 pC/N were successfully produced. 相似文献
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随着人们环保意识的增强,无铅压电陶瓷的研究和开发成为当前压电材料领域研究的热点。本文采用溶胶-凝胶法制备了BNT(钛酸铋钠)粉体,采用干压成型、高温电炉烧成无铅压电陶瓷样品,并对BNT粉体及无铅压电陶瓷样品进行了性能分析与结果讨论。 相似文献
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Xianya Wang Xinyu Liu Haoyue Xue Jie Yin Jiagang Wu 《Journal of the American Ceramic Society》2022,105(3):2116-2127
Chemically modified (typically, via B-site doping by Nb and Ta) Bi0.5Na0.5TiO3 (BNT)-based piezoelectric ceramics, which exhibit superior electro-strain behaviors than their perovskite peers, suffer from high hysteresis and poor temperature stability. In this study, the rarely studied dopant Sb is found to be effective in overcoming these two drawbacks by expanding the ergodic relaxor region to a wider temperature range. Excellent electro-strain (0.41%–0.46%) with reduced hysteresis (15%–20%) was observed over the temperature range of 40–120℃, with 12% variation of electro-strain in Bi0.5(Na0.78K0.22)0.5Ti0.9925Sb0.0075O3 samples. These results suggest that compared to previously reported BNT-based piezoelectric ceramics, Sb-modified BNT-based ceramics show higher potential for practical actuator applications. 相似文献
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Wangfeng Bai Leijie Wang Peng Zheng Fei Wen Jiwei Zhai Zhenguo Ji 《Ceramics International》2018,44(10):11402-11409
(Bi0.5Na0.5)TiO3 (BNT)-based piezoceramics usually exhibit enhanced piezoelectric coefficient d33 together with the deterioration of depolarization temperature Td, which is the common drawback limiting their use in practical application. Here, we demonstrate that harnessing the microstructure in BNT-based ceramics will be an efficient way to resolve this obstacle. <00l> oriented piezoelectric ceramics 0.94(Bi0.5Na0.5)TiO3 ?0.06BaTiO3 was engineered by templated grain growth (TGG) using NaNbO3 (NN) as templates. The manufactured textured ceramics with the optimized microstructure was characterized by not only approximately 200% enhancement in the magnitude of piezoelectric response (d33~297pC/N) but also improved thermal stability (Td~57?°C) in comparison to its randomly oriented counterparts (d33~151pC/N and Td~32?°C). Moreover, the enhanced piezoelectricity in grain oriented specimens primarily originated from a high degree of non-180° domain switching as compared to the randomly axed ones. The current study opens the door to pair high piezoelectric properties and enhanced thermal stability in BNT-related materials though texture technique. 相似文献
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《Ceramics International》2020,46(12):19752-19757
In this study, plate-like Na0.5Bi0.5TiO3 (BNT) templates with perovskite structure were obtained by two-step molten salt synthesis (MSS) method at a low temperature. Firstly, Bi4Ti3O12 precursors were synthesized at 1030 °C in NaCl–KCl molten salt. Secondly, plate-like Na0.5Bi0.5TiO3 particles with perovskite structure were obtained from plate-like layer-structured ferroelectric ceramic of Bi4Ti3O12 by topochemical microcrystal conversion method. Result showed that excessive Na2CO3 was beneficial to facilitate the low temperature synthesis. In the case of an excess of 30 mol% Na2CO3, plate-like BNT particles could be obtained by synthesis at temperatures ranging from 760 °C to 800 °C, which indicated a flexible processing route. Also, it has been observed that plate-like BNT particles show a high aspect ratio with 1 μm in thickness and 10–20 μm in length. These Na0.5Bi0.5TiO3 plate-like particles can be good candidates for the preparation of lead-free BNT-based piezoelectric ceramics with oriented grain microstructure. 相似文献
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《Ceramics International》2023,49(20):33073-33081
Lead-based Pb(Zr, Ti)O3 ceramics have been widely applied in piezoelectric actuators, and yet high temperature stability and large strain have been pursued for further application. In this work, a novel PbZrO3–PbTiO3-(Bi0.5Na0.5)TiO3 (PZ-PT-BNT) piezoelectric ceramic is designed and prepared by solid-state route. It is found that the introduction of BNT constituent enhances the relaxation behavior of PZ-PT ceramic, inhibits the abrupt change in dielectric properties near Curie temperature, and increases the proportion of tetragonal phase with high temperature stability. Meanwhile, the patterns of electric domains are intentionally modified by adjusting composition of PZ-PT-BNT. Short and broad electric domains in PZ-PT-0.03BNT ceramic are observed by piezoresponse force microscopy, which are insensitive to temperature and have faster response under electric field, contributing to strain characteristics. As a result, through integrating phase structure and electric domain configuration, a strain of 0.21% and excellent temperature stability where the variation of strain is less than 8% in the temperature range of 25–250 °C are achieved in PZ-PT-0.03BNT ceramic. The findings provide an effective strategy for improving the strain stability of PZ-PT-based piezoelectric ceramics, and demonstrate that PZ-PT-BNT ceramics have potential application prospects in high-temperature piezoelectric actuators. 相似文献
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Piezoelectric and ferroelectric properties of (Bi,Na)TiO3–(Bi,Li)TiO3–(Bi,K)TiO3 ceramics for accelerometer application
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Gyoung‐Ja Lee Byung‐Hoon Kim Sun‐A Yang Jin‐Ju Park Sang‐Don Bu Min‐Ku Lee 《Journal of the American Ceramic Society》2017,100(2):678-685
The piezoelectric and ferroelectric properties of 0.76(Bi0.5Na0.5)TiO3–0.04(Bi0.5Li0.5)TiO3–0.2(Bi0.5K0.5)TiO3 (abbreviated as 0.76BNT–0.04BLT–0.2BKT) ceramics were investigated to clarify the optimal sintering temperature, and the vibration characteristics were examined for a compression‐mode accelerometer assembly in which 0.76BNT–0.04BLT–0.2BKT ceramics sintered at the optimized temperature served as the piezoelectric elements. The increase in the grain size of the 0.76BNT–0.04BLT–0.2BKT ceramics with the sintering temperature provides a beneficial contribution to the piezoelectric coefficient; however, it detrimentally contributes to the depolarization temperature. The charge sensitivity of the prototype accelerometers was evaluated with changes in the seismic mass and the layer number of the piezoceramics. The deviation between the theoretical and measured values of charge sensitivity was less than 10%. 相似文献
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Xiaoxing Wang Helen Lai-Wa Chan Chung-Loong Choy 《Journal of the American Ceramic Society》2003,86(10):1809-1811
(Bi1/2 Na1/2 )TiO3 with 0–6 mol% Ba(Cu1/2 W1/2 )O3 (BNT-BCW), a new member of the BNT-based group, has been prepared following the conventional mixed oxide route. The compacted bodies were sintered at 1130°C for 2 h to get dense ceramics. The addition of BCW into BNT ceramics facilitated the poling process because of a reduction in leakage current. 0.995BNT·0.005BCW ceramics exhibit a relatively high piezoelectric constant ( d 33 = 80 × 10−12 C/N) and a relatively low dielectric loss (tan δ= 1.5%). Increased amount of BCW was found to increase the dielectric constant and loss of BNT-BCW ceramics and to suppress the grain growth. During sintering, some BCW diffuses into the lattice of BNT to form a solid solution and some remains on the grain boundaries. 相似文献