Evaluation of additive effects and homogeneity of the starting mixture on the nuclei-growth processes of barium titanate via a solid state route

Autor:	Toshimasa Suzuki, Youichi Mizuno, Nakayama Sayuri, Hiroshi Kishi, Mamoru Senna, Chie Ando
Rok vydání:	2008
Předmět:	Materials science Scanning electron microscope Mechanical Engineering Mineralogy Titanate Reaction rate chemistry.chemical_compound Crystallinity chemistry Chemical engineering Mechanics of Materials Barium titanate Homogeneity (physics) General Materials Science Particle size Electroceramics
Zdroj:	Journal of Materials Science. 43:6182-6192
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-008-2932-3
Popis:	In an attempt to obtain finest possible microparticles of BaTiO3 (BT) with highest possible tetragonality via a solid state route, starting mixtures comprising BaCO3 and TiO2 were subjected to various pretreatments including addition of glycine and mechanical activation. Reaction processes were monitored by the changes in the weight, crystallinity, and morphology in detail. While mechanical activation with glycine significantly increased the rate of reaction and homogeneity of the particle size of the product, BT, simultaneous particle growth of BT was intolerably acute for micro-electronic devices. The fast particle coarsening was predominated by the coalescence of BT tiny particles formed around titania. A mixture with higher homogeneity was attained by using finer starting materials under wet mixing, avoiding significant mechanical stressing. Particle growth of BT was suppressed to ca. 100 nm to obtain fully crystallized BT particles without significant loss of tetragonality and, hence, close to meet our requirements for MLCCs.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b1ce51b47cca6b092dbbd075d42b6152 https://doi.org/10.1007/s10853-008-2932-3 Zobrazit plný text záznamu Plný text ve formátu PDF