Texturing of hydrothermally synthesized BaTiO3 in a strong magnetic field by slip casting. Issue 4 (March 2016)

• Record Type: Journal Article
• Authors: Özen, Murat; Mertens, Myrjam; Snijkers, Frans; Tendeloo, Gustaaf Van; Cool, Pegie
• Is Part Of: Ceramics international. Volume 42:Issue 4(2016)
• Page Start: 5382
• Page End: 5390
• Publication Date: 2016-03
• Subjects: A. Slip casting -- B. X-ray methods -- D. BaTiO3 -- Magnetic alignment; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.12.073
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Barium titanate powder was processed by slip casting in a rotating strong magnetic field of 9.4 T. The orientation factor of the sintered compact was analyzed by the X-ray diffraction technique and the microstructure (grain-size) was analyzed by scanning electron microscope. The hydrothermally prepared barium titanate was used as matrix material and the molten-salt synthesized barium titanate, with a larger particle-size, was used as template for the templated grain-growth process. Addition of large template particles was observed to increase the orientation factor of the sintered cast (5 vol% loading). Template particles acted as starting grains for the abnormal grain-growth process and the average grain-size was increased after sintering. Increasing the solid loading (15 vol%) resulted in a similar orientation factor with a decrease of the average grain-size by more than half. However, addition of templates to the 15 vol% cast had a negative effect on the orientation factor. The impingement of growing particles was stated as the primary cause of particle misorientation resulting in a low orientation factor after sintering. Different heating conditions were tested and it was determined that a slow heating rate gave the highest orientation factor, the smallest average grain-size and the highest relative density.