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首页> 外文期刊>Journal of Materials Science >Preparation of monodispersed spherical barium titanate particles
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Preparation of monodispersed spherical barium titanate particles

机译：单分散球形钛酸钡颗粒的制备

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Spherical barium titanate particles with cubic phase were synthesized by a low-temperature hydrothermal reaction. Firstly, The method of hydrolysis of titanium tetrachloride was used for producing spherical TiO2 particles (0.45-1.5 mum) with various concentrations of TiCl4(0.05-0.2 M) and volume ratios of acetone to water solutions (RH 0-4). These TiO2 particles were converted to barium titanate by a hydrothermal conversion in a barium hydroxide solution. The size and morphology of the TiO2 particles was controlled by the volume ratio of acetone to water (RH ratio) in the mixed solvent. At the RH ratio of 3, the morphology of TiO2 particles was very uniform and discrete. These TiO2 particles were in the anatase phase and were converted to the rutile phase when the calcination temperature increased to 700degreesC and above. Uniform and spherical barium titanate particles were successfully synthesized from the as-prepared TiO2 particles by using a hydrothermal reaction in a barium hydroxide solution. The Ba/Ti ratios, reaction temperature, and reaction time did not influence the size and morphology of BaTiO3 particles, but increased the concentration of unfavorable salts such as Ba(OH)(2) and BaCO3. The high purity BaTiO3 particles could be obtained by washing with formic acid to remove the unfavorable salts. The size and morphology of the BaTiO3 particles remained the same as those of the TiO2 particles, confirming the in-situ transformation mechanism for the conversion of TiO2 to BaTiO3. The as-synthesized particles were cubic phase and transformed to tetragonal phase after calcinations at 1150degreesC for 1 h. The mean density of the pellets sintered at 1300degreesC for 2 h was 5.86 g/cm(3) and accounted for 97.34% of the theoretical density. (C) 2005 Springer Science + Business Media, Inc.
机译：通过低温水热反应合成了球形立方相钛酸钡颗粒。首先，采用四氯化钛的水解方法，制备了各种浓度的TiCl4（0.05-0.2 M）和丙酮与水溶液的体积比（RH 0-4）的球形TiO2颗粒（0.45-1.5 mum）。通过在氢氧化钡溶液中的水热转化将这些TiO 2颗粒转化为钛酸钡。通过混合溶剂中丙酮与水的体积比（RH比）控制TiO2颗粒的尺寸和形貌。在RH为3的情况下，TiO2颗粒的形态非常均匀且离散。这些TiO 2颗粒处于锐钛矿相并且当煅烧温度升高至700℃以上时转变成金红石相。通过在氢氧化钡溶液中进行水热反应，成功地从制得的TiO2颗粒中合成了均匀球形的钛酸钡颗粒。 Ba / Ti比，反应温度和反应时间不会影响BaTiO3颗粒的大小和形态，但会增加不利的盐（如Ba（OH）（2）和BaCO3）的浓度。通过用甲酸洗涤以除去不利的盐，可以获得高纯度的BaTiO 3颗粒。 BaTiO3颗粒的尺寸和形态与TiO2颗粒相同，这证实了TiO2向BaTiO3转化的原位转化机理。合成后的颗粒为立方相，并在1150℃下煅烧1小时后转变为四方相。 1300℃烧结2 h的颗粒平均密度为5.86 g / cm（3），占理论密度的97.34％。 （C）2005年Springer Science + Business Media，Inc.

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