Atomic resolution microstructure study of Bi-doped SrTiO3

• DOI: 10.1142/s2010135x24500048
• Publication Date: 2024-03-02T04:14:40Z
• Authors: Chao Li; Yijun Zhang; Guohua Dong; Guangliang Hu; Guang Yang; Chaoqiang Liu; Houwen Chen; Xiaoyong Wei
• Keywords: Strontium titanate; Nanoclusters

Intrinsic SrTiO 3 is a quantum paraelectric, but moderately Bi-doped exhibits dielectric frequency dispersion similar to relaxor ferroelectrics. In this paper, detailed electron microscopic studies of the microstructures samples were presented. It was found that Sr sites replaced by off-central Bi, resulting in tensile strain strontium titanate (STO) lattice. samples, valence titanium mainly showed Ti[Formula: see text] characteristic. According behavior and microstructure analysis, polar nanoregions (PNRs) composed strained nanoclusters should be responsible for ferroelectric with moderate Bi content.