Abstract
The dielectric tunability of dielectric materials has potential application value in many devices. The introduction of porous structures is beneficial to broaden the range of dielectric constants of ceramics and improve their dielectric tunability. In this study, the porous ceramics of 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 (BNT-6BT) were prepared using walnut shell as a sacrificial template. The addition of walnut shell powder produces an ordered columnar porous structure within the ceramic, resulting in porosity ranging from 0 to 20%. Porous ceramics show lower dielectric constants, but higher tunability. There is an improvement in the dielectric constant stability of porous ceramics. The ceramic layer between the ordered pores provides an effective barrier to microstress and strain in the vicinity of the pore structure, so that the longitudinal piezoelectric coefficient d33, and the transverse piezoelectric coefficient d31 decrease slowly with increasing porosity, maintaining the desired piezoelectric properties. The porous BNT-6BT ceramics studied in this paper can be used in piezoelectric transducers, broadening their potential applications.
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Funding was provided by the National Natural Science Foundation of China (Grant No. 52172099) and Provincial Joint Fund of Shaanxi (Grant No. 2021JLM-28).
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SX contributed to investigation, material preparation, data curation, and original draft writing. HD contributed to conceptualization and resources. YZ contributed to visualization. YH and ZT contributed to validation. YL contributed to formal analysis. XD participated in methodology.
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Xu, S., Du, H., Zhang, Y. et al. Dielectric tunability of 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 porous ceramics with oriented pore structure. J Mater Sci: Mater Electron 35, 284 (2024). https://doi.org/10.1007/s10854-024-12034-4
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DOI: https://doi.org/10.1007/s10854-024-12034-4