![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
High ordered Pb(Sc1/2Ta1/2)O3 (PST) ceramics were investigated by XRD, TEM and HREM. The results of XRD indicated that apparent degree of ordering S is 0.79 for PST crystals. The strong (1/2,1/2,1/2) superlattice reflections were observed in the electron diffraction patterns of PST. In the dark field images of PST crystals, a lot of ordered domains in 50–200 nm and the antiphase boundaries (APB) and disordered region among ordered domains were discovered. HREM photographs showed lattice images of APBs for PST crystals. It was pointed out that APBs were actually gradually changed area with B-site cations disordered in size of several to tens perovskite cells and there were disordered domains (2∼5 nm) in large ordered area. The forming of APBs was regarded as the result of growth process through atom diffusion.