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首页> 外文会议>8th China international nanoscience and technology symposium >Sol-gel synthesis and characterization of nanocrystalline (Bi0.5Na0.5)TiO3 powders from the poly vinyl alcohol evaporation route
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Sol-gel synthesis and characterization of nanocrystalline (Bi0.5Na0.5)TiO3 powders from the poly vinyl alcohol evaporation route

机译：聚乙烯醇蒸发路线的溶胶-凝胶法合成和表征纳米（Bi0.5Na0.5）TiO3粉末

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摘要

Nanocrystalline pure perovskite phase bismuth sodium titanate ((Bi0.5Na0.5))TiO3(BNT) powders have been prepared by a sol-gel method from the poly vinyl alcohol evaporation route, bismuth nitrate [Bi(NO3)3], tetra-butyl titanate [Ti(OC4H9)4] and sodium acetate(CH3COONa) were used as raw materials and poly vinyl alcohol(PVA) as the sol-gel forming solvent. Stoichiometric amounts of the individual raw materials were thoroughly mixed in accordance with the BNT composition to form the stock solution. The pH of the stock was adjusted to 1-3 by adding acetate. Aqueous solution of PVA[10%(w/v)] was then added to the cationic mixture with thorough stirring. The weight ratio of the canonic mixture to the PVA aqueous solution was maintained at 2∶1. The resulting viscous liquid was then heated over a hot crucible up to form a fluffy dry gel. The fluffy dry gels were calcined at different temperatures and times and then cooled to room temperature naturally. The X-ray powder diffraction(XRD) patterns of the heat-treated powders were obtained using a Broker D8 Advance X-ray diffractometer with Cu Ka radiation and nickel filter. Scanning electron microscope (SEM) studies of the NBT powders were performed using a JSM-6700F electron microscope. Phase-pure BNT powders were obtained at 550℃ for 2-2.5h which is relatively lower calcination temperature than other reports. The BNT powders consists of phase-pure perovskite nanocrystals with an average size of 100-200nm.
机译：纳米晶纯钙钛矿相钛酸钠铋（（Bi0.5Na0.5））TiO3（BNT）粉末是通过溶胶-凝胶法从聚乙烯醇的蒸发路线，硝酸铋[Bi（NO3）3]，钛酸丁酯[Ti（OC4H9）4]和乙酸钠（CH3COONa）被用作原料，聚乙烯醇（PVA）作为形成溶胶-凝胶的溶剂。将化学计量量的各原料按照BNT组成充分混合以形成储备溶液。通过加入乙酸盐将原液的pH调节至1-3。然后在充分搅拌下将PVA [10％（w / v）]的水溶液加入到阳离子混合物中。典型混合物与PVA水溶液的重量比保持在2∶1。然后将得到的粘性液体在热坩埚上加热直至形成蓬松的干凝胶。将蓬松的干凝胶在不同的温度和时间下煅烧，然后自然冷却至室温。使用具有Cu Ka辐射和镍滤光片的Broker D8 Advance X射线衍射仪获得热处理后粉末的X射线粉末衍射（XRD）图。使用JSM-6700F电子显微镜对NBT粉末进行扫描电子显微镜（SEM）研究。在550℃下进行2-2.5h制得的纯相BNT粉体的煅烧温度比其他报道要低。 BNT粉末由平均尺寸为100-200nm的相纯钙钛矿纳米晶体组成。

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  • 会议地点 Xiangtan(CN);Xiangtan(CN)
  • 作者

    Liu Haitao; Wang xiaohui; Li Longtu;

  • 作者单位

    College of Chemistry and Material Engineering,Wenzhou University,Wenzhou,325035 P.R.China State Key Laboratory of New Ceramics and Fine Processing,Department of Material Science and Engineering,Tsinghua University,Beijing,100084 P.R.China;

    State Key Laboratory of New Ceramics and Fine Processing,Department of Material Science and Engineering,Tsinghua University,Beijing,100084 P.R.China;

    State Key Laboratory of New Ceramics and Fine Processing,Department of Material Science and Engineering,Tsinghua University,Beijing,100084 P.R.China;

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