Mechanical-chemical interaction during milling of Ba5Nb4O15 hexagonal perovskite and its influence on microwave performance. (August 2017)

• Record Type: Journal Article
• Authors: Tsao, Chung-Ya; Feng, Kuei-Chih; Tuan, Wei-Hsing
• Is Part Of: Ceramics international. Volume 43(2017)Supplement 1
• Page Start: S312
• Page End: S316
• Publication Date: 2017-08
• Subjects: A: Milling -- B: Microstructure-final -- C: Electrical property -- D: Perovskite; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.05.282
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The milling of powder is a common practice for the production of many ceramic components. Nevertheless, the milling of ceramic powder involves many mechanical-chemical interactions. In the present study, the interactions during the milling of a Ba5 Nb4 O15 powder are investigated. Though the particle size of the powder is reduced after milling, more barium ions are released into the slurry with increasing milling time. The release of Ba 2+ during milling modifies the resulting microstructure and crystalline structure of sintered specimen. The microstructure is refined; the periodicity of cations within the layered perovskite structure is decreased with the increase of milling time. As a consequence, the permittivity and quality factor of Ba5 Nb4 O15 microwave ceramic are decreased.