高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (3): 340.

• 论文 • 上一篇    下一篇

纳米晶钛镧酸盐的水热合成和表征

毛雅春, 冯守华   

  1. 吉林大学无机水热合成和制备化学实验室, 长春, 130023
  • 收稿日期:1997-05-20 出版日期:1998-03-24 发布日期:1998-03-24
  • 通讯作者: 冯守华
  • 作者简介:毛雅春,女,25岁,博士研究生.
  • 基金资助:

    国家自然科学基金资助课题.

Mild Hydrothermal Syntheses and Characterization of Nanocrystalline Titanlanthanates

MAO Ya-Chun, FENG Shou-Hua   

  1. Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130023
  • Received:1997-05-20 Online:1998-03-24 Published:1998-03-24

摘要: 报道了在TiO2-La2O3-M2O-H2O水热体系中,新型钛镧酸盐M0.5La0.5TiO3(M=La,Ag0.66Na0.33,Li0.6Na0.4)的水热合成,用XRD、SEM、TEM、ICP、DTA-TG、IR和ac阻抗分析技术进行了结构表征.讨论了水热合成反应体系pH、反应混合物的组成比以及晶化温度等因素对合成的影响.XRD分析表明,Na0.5La0.5TiO3和Ag0.33Na0.17La0.5TiO3具有立方结构,晶胞参数分别为a=0.3877nm和a=0.3890nm.Li0.3Na0.2La0.5TiO3具有正交结构,a=0.3894nm,b=0.3912nm,c=0.3890nm.TEM测定显示Na0.5La0.5TiO3和Ag0.33Na0.17La0.5TiO3是纳米尺度晶体,平均粒度分别为50nm和70nm.Li0.3Na0.2La0.5TiO3的平均粒度分布为5Lm.Ag0.33Na0.17La0.5TiO3在440℃的电导率为1.9×10-5S/cm,Li0.3Na0.2La0.5TiO3的电导率为1.5×10-6S/cm.

关键词: 水热合成, 纳米晶体, 导电性质, 钛镧酸盐

Abstract: Novel perovskite titanlanthanates, M0.5La0.5TiO3 (M=Na, Ag0.66Na0.33, Li0.6Na0.4) were hydrothermally synthesized under mild conditions, and characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM), differential thermal and thermogravometric analyses(DTA-TG), inductively coupled plasma analysis(ICP) and infrared spectroscopy(IR). The ionic transport properties were measured by an ac impedance method. Some factors, e.g., crystallization temperature, pH, and Ti/La molar ratio in reaction mixture dominate the hydrothermal syntheses of the single phase products. Na0.5La0.5TiO3 and Ag0.33Na0.17La0.5TiO3 crystallized in cubic system with cell parameters: a =0.3877 nm and a =0.3890 nm, respectively, whereas Li0.3Na0.2La0.5TiO3 has orthorhombic symmetry with parameters a =0.3894 nm, b =0.3912 nm and c =0.3890 nm. Under a similar experimental condition, the average particle sizes of the products are 50 nm for Na0.5La0.5TiO3, 70 nm for Ag0.33 Na0.17La0.5TiO3 and 5 Lm for Li0.3Na0.2La0.5TiO3. An ac impedance study indicates that conductivities of Ag0.33 Na 0.17La0.5TiO3 and Li0.3Na0.2La0.5TiO3 at 713 Kare 1×10-5 and 1×10-6 S/cm, respectively.

Key words: Hydrothermal syntheses, Nanocrystalline, Conductivity, Titanlanthanate

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