Formation and Electric Properties of Lead Magnesium Niobate

铌镁酸铅的形成及电性能

• 批准号: 04680058
• 负责人: HIROTA Ken
• 金额: $ 1.09万
• 依托单位: Doshisha University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04680058/
• 关键词: Alkoxide; Perovskite; Magnesium; Niobium; Lead; Oxide; ニオブ

As the 1st step of synthesis for lead magnesium niobate, formation of magnesium niobate as a precursor was investigated. A new modification of MgNb_2O_6 was crystallized at 510ﾟ - 550ﾟC from amorphous material prepared by the simultaneous hydrolysis of magnesium ethoxide and niobium ethoxide.To obtain high dielectric constant at room temperature, the ceramics with the composition of 0.9Pb(Mg_<1/3>Nb_<2/3>)O_3-0.1PbTiO_3 was fabricated using powders prepared by the alkoxy-method. The ceramics sintered at 1250ﾟC with the densities >98 % T.D.consisted of grains of 1 - 6mum in size. The dielectric constant of the ceramics showed the values between 7000 and 2500 at 1 kHz.

作为合成铅镁酸盐的第一步，研究了作为前驱体的铅镁酸盐的形成。以乙醇镁和乙醇铌同时水解制备的非晶材料为原料，在510 - 550 ℃下晶化MgNb_2O_6，并采用烷氧基法制备的粉体制备了0.9Pb（Mg_（1/3）Nb_（2/3））O_3-0.1PbTiO_3的高介电常数陶瓷。在1250 ℃下烧结的陶瓷密度>98 % T.D.，由尺寸为1 - 6 μ m的晶粒组成。陶瓷的介电常数显示在1 kHz下的值在7000和2500之间。