Temperature Dependence on Mechanical, Dielectric, and Electric Field-Induced Strain Properties of Lead-Free BNST Ceramics
Kamonporn Saenkam, Pharatree Jaita, Parkpoom Jarupoom, Chamnan Randorn, Komsanti Chokethawai, Gobwute Rujijanagul and Tawee Tunkasiri* Author for corresponding; e-mail address: pharatree@gmail.com
Volume: Vol.49 No.1 (Special Issue I : Jan 2022)
Research Article
DOI: https://doi.org/10.12982/CMJS.2022.004
Received: 9 March 2021, Revised: 1 July 2021, Accepted: 3 July 2021, Published: -
Citation: Saenkam K., Jaita P., Jarupoom P., Randorn C., Chokethawai K., Rujijanagul G., et al., Temperature Dependence on Mechanical, Dielectric, and Electric Field-Induced Strain Properties of Lead-Free BNST Ceramics, Chiang Mai Journal of Science, 2022; 49(1): e2022004. DOI 10.12982/CMJS.2022.004.
Abstract
In this research, temperature dependence on the phase evolution, physical, microstructure, mechanical, dielectric, and electric field-induced strain responses of the Bi0.41Na0.35Sr0.21TiO3 or BNST ceramics were investigated. The BNST ceramic was prepared by a conventional mixed oxide method and sintered at various temperatures from 1100 °C to 1175 °C in order to clarify the optimal sintering temperature for all propereties. X-ray diffraction results showed that all ceramics exhibited a single perovskite without any secondary phases. A mixed between tetragonal and rhombohedral phases were identified for all ceramics. Grain size tended to increase with increasing the sintering temperature. The mechanical improvement was related with the change in densification. The optimum relative density (95.83 %), mechanical (HV = 6.43 GPa, HK = 5.12 GPa, E = 107.57 GPa, and KIC = 2.42 MPa.m1/2), and dielectric properties (ε′ = 1752, tan δ = 0.0514, and δA = 100 K), were obtained for the ceramic sintered at 1125 - 1150 °C. In addition, the obtimum sintering temperature of 1125 - 1150 °C were also found to improve the electric field-induced strain response (Smax = 0.14 % and d*33 = 285 pm/V), and the electrostrictive coefficient (Q33 = 0.0199 m4/C2).
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