Preparation of nm-sized barium titanate fine particles and their powder dielectric properties
Preparation of nm-sized barium titanate fine particles and their powder dielectric properties
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DOI：
10.1143/jjap.42.6188
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发表时间：
2003-09-01
期刊：
影响因子：
--
通讯作者：
Tsurumi, T
中科院分区：
文献类型：
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作者：
Wada, S;Yasuno, H;Tsurumi, T
采用草酸钛酸钡(BaTiO(C2O4)（2)-4H(2)O）两步热分解法制备了粒径在17 ~ 100nm之间的钛酸钡（BaTiO3）晶体。通过x射线衍射（XRD）测量，BaTiO3颗粒的晶体结构为立方m-3m，通过拉曼散射测量，BaTiO3颗粒的晶体结构为四边形4mm。利用TG-DTA和FIF-IR对这些颗粒中的杂质进行了研究，结果表明，在BaTiO3晶格中没有检测到杂质，而羟基和碳酸盐基团仅在表面检测到。采用改进的粉末介电测量方法，用悬浮液测量了这些粉末的介电常数。结果表明，粒径在70nm左右的batio(3)粒子的介电常数最大可达15000以上。该研究表明，尺寸约为70nm的BaTiO3颗粒最适合电容器应用。
Barium titanate (BaTiO3) crystallites with various particle sizes from 17 to 100nm were prepared by the 2-step thermal decomposition method of barium titanyl oxalate (BaTiO(C2O4)(2)-4H(2)O). The crystal structure of these BaTiO3 particles was assigned to cubic m-3m by a X-ray diffraction (XRD) measurement while it was assigned to tetragonal 4mm by a Raman scattering measurement. Investigation of impurity in these particles using both TG-DTA and FIF-IR measurements revealed that no impurity was detected in the BaTiO3 lattice while hydroxyl and carbonate groups were detected only on the surface. The dielectric constants of these powders were measured using suspensions by a modified powder dielectric measurement method. As a result, the dielectric constant of B aTiO(3) particles with a size of around 70nm exhibited a maximum of over 15,000. This study revealed that BaTiO3 particles with a size around 70nm were the most desirable for capacitor application.