CITRATE ROUTE TO ULTRA-FINE BARIUM POLYTITANATES WITH MICROWAVE DIELECTRIC-PROPERTIES

被引：45

作者：

CHOY, JH ^{[1
]}

HAN, YS ^{[1
]}

KIM, JT ^{[1
]}

KIM, YH ^{[1
]}

机构：

[1] KOREA INST SCI & TECHNOL, DIELECTR CERAM LAB, SEOUL 130650, SOUTH KOREA

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1995年 / 5卷 / 01期

关键词：

D O I：

10.1039/jm9950500057

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Highly reactive and ultra-fine barium polytitanates (BaO-nTiO(2), n=4, 4.5, 5) with a particle size of 30-50 nm have been prepared by the citrate route. Solubility isotherms were calculated for the BaCO3-citric acid-H2O and TiO(OH)(2)-citric acid-H2O-H2O systems at 25 degrees C to predict the optimum pH condition for preparing pure and stable citrate complexes. Pure and well crystallized powders with monodispersive, nanometer-sized particles could be obtained by thermal decomposition of the optimally prepared citrate precursors at relatively low temperatures. Details of the crystallization process and particle characteristics of citrate-derived barium polytitanates are described. The sinterability and microwave dielectric properties of BaTi4O9 and Ba2Ti9O20 were also measured and are discussed briefly.

引用

页码：57 / 63

页数：7