| 过量Na+对(K0.5Na0.5)NbO3-LiNbO3无铅压电陶瓷相组成及结构的影响 |
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| 引用本文： | 汤威,刘云飞,王国勇,李鸿鹏,吕忆农. 过量Na+对(K0.5Na0.5)NbO3-LiNbO3无铅压电陶瓷相组成及结构的影响[J]. 南京工业大学学报(自然科学版), 2011, 33(2): 42-46. DOI: 10.3969/j.issn.1671-7627.2011.02.010 |
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| 作者姓名： | 汤威 刘云飞 王国勇 李鸿鹏 吕忆农 |
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| 作者单位： | 南京工业大学,材料科学与工程学院,材料化学工程国家重点实验室,江苏,南京,210009 |
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| 基金项目： | 江苏省环保科技基金资助项目 |
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| 摘 要： | 通过固相反应法预合成0.94(K0.5Na0.5)NbO3-0.06LiNbO3(KNLN6)无铅压电陶瓷粉体。采用X线衍射仪(XRD)、扫描电子显微镜/能谱仪(SEM/EDS)和高分辨透射电子显微镜(HRTEM)对KNLN6试样进行性能表征。结果表明:按化学计量配比合成的KNLN6粉体中含有K3Li2Nb5O15(KLN)第二相;Na2CO3摩尔分数过量5%时,可有效地消除第二相KLN,从而获得单一钙钛矿结构的KNLN6粉体,同时,粉体的预烧温度降低了50℃;在1070℃下烧结2 h制备的Na2CO3过量5%的无铅压电陶瓷中,KNLN6晶体具有A位无序的单一正交钙钛矿结构,晶粒呈立方体状,平均尺寸约为10μm。
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| 关 键 词： | 铌酸钾钠-铌酸锂 无铅压电陶瓷 晶体结构 |
Influences of excess Na+ on phase composition and microstructure of (K0.5 Na0.5)NbO3-LiNbO3 lead-free piezoceramics |
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| TANG Wei,LIU Yunfei,WANG Guoyong,LI Hongpeng,Lü Yinong. Influences of excess Na+ on phase composition and microstructure of (K0.5 Na0.5)NbO3-LiNbO3 lead-free piezoceramics[J]. Journal of Nanjing University of Technology, 2011, 33(2): 42-46. DOI: 10.3969/j.issn.1671-7627.2011.02.010 |
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| Authors: | TANG Wei LIU Yunfei WANG Guoyong LI Hongpeng Lü Yinong |
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| Affiliation: | TANG Wei,LIU Yunfei,WANG Guoyong,LI Hongpeng,Lü Yinong (State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China) |
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| Abstract: | Lithium sodium potassium niobate 0.94(K0.5Na0.5)NbO3-0.06LiNbO3(KNLN6) lead-free piezoelectric ceramic powders were prepared by solid state reaction technique.X-ray diffractometer(XRD),scanning electron microscope/energy-dispersive spectrometer(SEM/EDS) and high resolution transmission electron microscope(HRTEM) were used as property characteristic for KNLN6 samples.Results showed that the second phase K3Li2Nb5O15(KLN) was detected in stoichiometric KNLN6 powders.After introducing 5% excess Na2CO3 into the starting mixture,the second phase KLN was eliminated,and powders with a single perovskite structure were obtained,and the calcination temperature was also decreased by 50 ℃.KNLN6 crystals in lead-free piezoelectric ceramics with 5% excess of Na2CO3 sintered at 1 070 ℃ for 2 h had an A-site disordered orthorhombic perovskite structure,and grains were cuboid with an average size of about 10 μm. |
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| Keywords: | lithium sodium potassium niobate lead-free piezoelectric ceramics crystal structure |
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