Brillouin spectroscopy study of the stress-induced ferroelectric order in lead-free relaxor 0.93(Na1/2Bi1/2)TiO3-0.07BaTiO3 ceramics. (1st October 2022)

• Record Type: Journal Article
• Authors: Martin, Alexander; Brehl, Martin; Khansur, Neamul H.; Werr, Ferdinand; de Ligny, Dominique; Webber, Kyle G.
• Is Part Of: Acta materialia. Volume 238(2022)
• Publication Date: 2022-10-01
• Subjects: Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2022.118218
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: In this study, in situ stress-dependent Raman and Brillouin spectroscopy has been performed on polycrystalline 0.93(Na1/2 Bi1/2 )TiO3 -0.07BaTiO3 (NBT-7BT). Brillouin scattering revealed stress-dependent changes in the elastic properties around the onset stress as well as the appearance of a transversal acoustic wave mode at elevated stress levels, which is understood to be due to the formation of long-range order. These data were compared with additional Raman scattering measurements, ex situ x-ray diffraction, and macroscopic stress-strain behavior, which revealed analogous changes in the apparent crystallographic structure and ferroelectric order in the vicinity of the onset and coercive stresses. Graphical abstract: Image, graphical abstract