As a promising material for lead free positive temperature coefficient of resistivity (PTCR) ceramics, La doped (12x)BaTiO 3 -x(Bi 0?5 K 0?5 )TiO 3 [(12x)BT-xBKT] samples with 0#x#0?04 were prepared by a citrate-nitrate sol-gel method. The corresponding gels were heated at different temperatures (500, 600 and 800uC) to study the conditions necessary for the formation of the pure BT-BKT. Single phased perovskite powders with average particles size of 70 nm were obtained by heating the precursor gels at 800uC for 1 h in air. The crystal structure, microstructure and the electrical properties of La doped BT-BKT samples were studied. When the content of La was 0?2 mol.-%, the 0?99BT-0?01BKT ceramic showed the lowest r RT . With increasing addition of BKT, the Curie temperature (T c ) and the room temperature resistivity (r RT ) increased. When the content of BKT was 4 mol.-%, the sample sintered in air atmosphere still showed good PTCR behaviours with T c 5143uC, r RT 51?1610 4 V cm and lg (r max /r min )53?76.
Li 7 La 3 Zr 2 O 12 (LLZO) solid electrolyte with garnet structure is expected to become an important development direction of lithium-ion batteries in the future due to its large electrochemical window, good heat resistance and high safety. Since the lithium ions in c-LLZO are easier to diffuse than those in t-LLZO, the ionic conductivity of c-LLZO is two orders of magnitude higher than that of t-LLZO. Element doping is an important way to improve its ionic conductivity. Nb doping in LLZO stabilizes the cubic phase structure of LLZO by Zr doping, which will improve the ionic conductivity of LLZO at room temperature. Therefore, in this study, we studied the phase composition, microstructure and room temperature ionic conductivity of LLZO electrolyte doped with different contents of Nb by solid state reaction. Through comparative analysis, the electrolyte prepared by doping Y = 0.4 niobium element content has the best relative density (89.1 %) and room temperature ionic conductivity (2.05×10 -4 S cm -1 ).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.