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Fuel Cells
Published in Michael F. Hordeski, Emergency and Backup Power Sources:, 2020
Advances in modern ceramic technology and solid-state devices are pushing the development of a range of efficient units. Many ceramics can be tailored to display electrical properties unattainable in their metallic or polymeric counterparts. These materials are called electroceramics. One group of electroceramics, the fast oxygen ion conductors, are used in devices such as oxygen sensors, oxygen pumps, exhaust catalysts and solid oxide fuel cells (SOFCs).
Enhanced electric field-induced strain and electrostrictive response of lead-free BaTiO3-modified Bi0.5(Na0.80K0.20)0.5TiO3 piezoelectric ceramics
Published in Journal of Asian Ceramic Societies, 2021
Pharatree Jaita, Parkpoom Jarupoom
Therefore, the composition of Bi0.5(Na0.80K0.20)0.5TiO3 or BNKT, which is the MPB composition within the tetragonal and rhombohedral phases (an increasing of the number of polar axes), was selected in this work as the base material due to its has a good piezoelectric properties at MPB region. The BaTiO3 (tetragonal phase) was chosen as part of the solid solution with the BNKT ceramic because of its superior dielectric and ferroelectric performances, that make it extremely important system for fundamental electroceramics research. This research thus aimed to fabricate the binary system of (1-x)BNKT-xBT ceramics. We have studied in detail of the phase structure, relaxor behavior, ferroelectric, and dielectric properties with varying concentration of the BT additive. To our knowledge, the effects of BT concentrations on the electric field-induced strain response of the BNKT ceramic have not yet been done so far. So we have focused on the study of the electric field-induced strain properties. In addition, in order to observe the possible correlation between Q33 as a function of BT concentration in this study, we investigated the electrostrictive properties of the BNKT-BT ceramics with a large variation of x from x = 0 to x = 0.15, and revealed a linear relationship between Q33 as a function of BT concentration. Optimum composition with an enhancement electrical properties was obtained. It is expected that the new system has great potential for excellent electrical properties as compared to the pure BNKT ceramic or other systems.