Effect of cerium doped concentration on grain growing modes of BST powder. Issue 171 (3rd May 2016)

• Record Type: Journal Article
• Authors: Liao, Jia Xuan; Feng, Ting Ting; Hu, Yi Ming; Wang, Si Zhe; Yang, Han Yu; Wu, Meng Qiang
• Is Part Of: Integrated ferroelectrics. Issue 171(2016)
• Page Start: 79
• Page End: 86
• Publication Date: 2016-05-03
• Subjects: BST powder -- Ce doped concentration -- grain growing mode -- sol-gel; Ferroelectric devices -- Periodicals; Integrated circuits -- Periodicals; 537.244805
• DOI: 10.1080/10584587.2016.1172007
• Languages: English
• ISSNs: 1058-4587

Abstract

ABSTRACT: Cerium (Ce) doped barium strontium titanate (Ce-BST) powder was prepared by sol-gel method, and the effect of Ce doped concentration on growing modes of grains of the Ce-BST powder was studied. X-ray diffraction (XRD) reveals that all Ce-BST powders show cubic perovskite structures. It can be found that increasing Ce doped concentration corresponds to decreasing lattice parameter until the doped concentration increases to 3% mol ratio, and then the continuingly increasing doped concentration corresponds to increasing lattice parameter. Scanning electron microscopy (SEM) exhibits that all powders are composed of nano-grains, but the growing modes of the grains strongly depend on the doped concentration. When doped concentration is not more than 1% mol ratio, the grains show globular growth; when the doped concentration is not less than 3% mol ratio, the grains show layered growth; when the doped concentration ranges from 1% mol ratio to 3% mol ratio, columnar grains appear in the globular powders. Also, the dielectric properties of the powders are presented and the related mechanisms are discussed.