Dielectric relaxation and electrical conduction in (BixNa1−x)0.94Ba0.06TiO3 ceramics. Issue 2 (13th October 2017)

• Record Type: Journal Article
• Authors: Li, Xiaojuan; Jing, Qi; Xi, Zengzhe; Liu, Peng; Long, Wei; Fang, Pinyang
• Is Part Of: Journal of the American Ceramic Society. Volume 101:Issue 2(2018)
• Page Start: 789
• Page End: 799
• Publication Date: 2017-10-13
• Subjects: annealing -- conductivity -- dielectric relaxation -- ferroelectricity/ferroelectric materials -- impedance spectroscopy; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15270
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: The dielectric relaxation and electrical conduction were investigated in (Bi x Na1− x )0.94 Ba0.06 TiO3 (Abb. x BNBT6, x = 0.5, 0.495, 0.485, and 0.475) ceramics prepared by solid state reaction. With a decrease in x, the dielectric properties of the ceramics decreased, whereas the electrical conduction increased, resulting in a transition from insulator to oxide‐ions conductor. When x = 0.475, the ceramics exhibited large conductivity (~10 −3 S cm −1 at 575°C) and low activation energy (~0.45 eV), indicating their potential application in solid oxide fuel cells. A mixed conduction mechanism with oxide‐ions, electrons, and holes was proposed. With a decrease in x from 0.495 to 0.475, it was found that the p ‐type conduction was switched to n ‐type conduction. The dielectric relaxation of the x = 0.495 sample was associated with short‐range hopping of oxygen vacancies. However, the dielectric properties of the x = 0.485 and 0.475 samples can be explained by Maxwell‐Wagner interface relaxation.