Template-free aqueous tape casting of hydrothermally synthesized barium titanate powder and the fabrication of highly {001}-{100} textured tapes. Issue 8 (1st June 2018)

• Record Type: Journal Article
• Authors: Özen, Murat; Mertens, Myrjam; Snijkers, Frans; Cool, Pegie
• Is Part Of: Ceramics international. Volume 44:Issue 8(2018)
• Page Start: 9720
• Page End: 9727
• Publication Date: 2018-06-01
• Subjects: A. Sintering -- A. Tape casting -- B. X-ray methods -- D. BaTiO3 and titanates; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.02.203
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Aqueous slurries of hydrothermally prepared barium titanate (BaTiO3 ) powders were tape casted without the use of large anisotropic template materials. The tapes were sintered at 1400 °C or 1500 °C, and at different furnace parameters. The texture of the sintered tapes was evaluated by the semi-quantitative XRD Lotgering method and the microstructure was studied by SEM. The Lotgering factor ( f ) of the sintered tapes was positively influenced by two main variables. First, directly heating to the sintering temperature resulted in a 22–30% increase. Second, sintering in the liquid-phase (Ti-excess) temperature region and at a high enough temperature (1500 °C) drastically improved the relative intensity of the {100} and {001} lines by 72%, at the expense of the {101}- and {111}-lines. The average volume weighted grain-size of the tape, which was directly heated to the sintering temperature (i.e., skipping the calcination step), was decreased by 77%.