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Title: | Low-temperature-sintered Bi0.5Na0.5TiO3-based lead-free ferroelectric ceramics with good piezoelectric properties | Authors: | Chung, TH Sun, H Wen, R Kwok, KW |
Issue Date: | Mar-2018 | Source: | Ceramics international, Mar. 2018, v. 44, no. 4, p. 4027-4032 | Abstract: | Li2CO3 has been used as a sintering aid for fabricating lead-free ferroelectric ceramic 0.93(Bi0.5Na0.5TiO3)-0.07BaTiO3. A small amount (0.5 wt%) of it can effectively lower the sintering temperature of the ceramic from 1200 °C to 980 °C. Unlike other low temperature-sintered ferroelectric ceramics, the ceramic retains its good dielectric and piezoelectric properties, giving a high dielectric constant (1570), low dielectric loss (4.8%) and large piezoelectric coefficient (180 pC/N). The “depolarization” temperature is also increased to 100 °C and the thermal stability of piezoelectricity is improved. Our results reveal that oxygen vacancies generated from the diffusion of the sintering aid into the lattices are crucial for realizing the low temperature sintering. Owing to the low sintering temperature and good dielectric and piezoelectric properties, the ceramics, especially of multilayered structure, should have great potential for practical applications. | Keywords: | BNTBT Low-temperature sintering Piezoelectric properties |
Publisher: | Pergamon Press | Journal: | Ceramics international | ISSN: | 0272-8842 | EISSN: | 1873-3956 | DOI: | 10.1016/j.ceramint.2017.11.198 | Rights: | © 2017 Elsevier Ltd and Techna Group S.r.l. All rights reserved © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ The following publication Chung, T. H., Sun, H., Wen, R., & Kwok, K. W. (2018). Low-temperature-sintered Bi0. 5Na0. 5TiO3-based lead-free ferroelectric ceramics with good piezoelectric properties. Ceramics International, 44(4), 4027-4032. is available at https://doi.org/10.1016/j.ceramint.2017.11.198. |
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Effective_Liquid-Phase_Sintering.pdf | Pre-Published version | 1.13 MB | Adobe PDF | View/Open |
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