SYNTHESIS AND PROCESSING OF BARIUM-TITANATE CERAMICS FROM ALKOXIDE SOLUTIONS AND MONOLITHIC GELS

被引：124

作者：

FREY, MH ^{[1
]}

PAYNE, DA ^{[1
]}

机构：

[1] UNIV ILLINOIS,BECKMAN RES INT,URBANA,IL 61801

来源：

CHEMISTRY OF MATERIALS | 1995年 / 7卷 / 01期

关键词：

D O I：

10.1021/cm00049a019

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：

We report the sol-gel processing of barium titanate (BaTiO3) ceramics from methoxyethoxide precursors. The effects of heat treatment on phase and microstructure development for solution- and gel-derived ceramics are reported. Drying of monolithic alcogels yielded the low-temperature (T < 125 degrees C) crystallization of BaTiO3. Crystallization was associated with gel syneresis. Nanocrystalline BaTiO3 gels which crystallized before the removal of solvent were used as monolithic precursors for the powderless processing of fine-grain dielectrics. Lower levels of hydrolysis content for solution-derived ceramics led to higher crystallization temperatures for the perovskite phase. In these cases, BaTiO3 crystallized via an intermediary oxycarbonate phase. The efficiency with which carbonaceous species were eliminated during calcination of powders derived from sols or gels was investigated by thermal analysis, infrared spectroscopy, and helium gas pycnometry. Dielectric properties were determined for dense ceramics derived from monolithic xerogels. Micrographs illustrate the development of structure for ceramics derived from the xerogel precursors.

引用

页码：123 / 129

页数：7

共 27 条

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