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| Main Authors: | , , , |
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| Format: | Artículo Open Access |
| Published: |
Wiley
2024
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| Subjects: | |
| Online Access: | https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.19701 |
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Table of Contents:
- Sintering of large‐sized and near‐stoichiometric BNT ceramics with enhanced dielectric and electrostrictive properties Huilu Guo Minmin Zhu Yida Zhao Zehui Du Journal of the American Ceramic Society Abstract Sintering for large‐sized, stoichiometric Bi 0.5 Na 0.5 TiO 3 (BNT) ceramics is of great challenge due to the loss of volatile Bi/Na at A‐site of perovskite structure. In this work, BNT ceramic tile with the size of ∼10 × 10 cm 2 and near‐stoichiometric composition has been successfully fabricated by Isobam‐assisted gelcasting process, followed by sintering with 1150°C calcined power bed. The powder bed used and sintering duration were found to have a great influence on the formation of the Na‐deficient phase (Bi 4.5 Na 0.5 Ti 4 O 15 ) in the ceramics, and the strategies to eliminate it have been explored. The obtained ceramics exhibit a dielectric constant/loss of 673.6/0.039 at 1 kHz, as well as an electrostrictive strain of ∼0.07% which corresponds to a converse piezoelectric constant of 105.2 pm/V. Our work thus provides an effective approach to prepare large‐sized and stoichiometric BNT ceramics. 10.1111/jace.19701 http://onlinelibrary.wiley.com/termsAndConditions#vor