Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Microstructures and Mechanical Properties of Zirconium-Doped Bismuth Sodium Titanate Ceramics

Anucha Watcharapasorn*, Sukanda Jiansirisomboon and Tawee Tunkasiri
* Author for corresponding; e-mail address: anucha@stanfordalumni.org
Volume: Vol.33 No.2 (MAY 2006)
Research Article
DOI:
Received: 11 November 2005, Revised: -, Accepted: 19 January 2006, Published: -

Citation: Watcharapasorn A., Jiansirisomboon S. and Tunkasiri T., Microstructures and Mechanical Properties of Zirconium-Doped Bismuth Sodium Titanate Ceramics, Chiang Mai Journal of Science, 2006; 33(2): 169-173.

Abstract

Zirconium-doped bismuth sodium titanate (BNTZ) powders were prepared using a conventional mixed-oxide method. After checking for phase purity by X-ray diffraction analysis, the synthesized powders were pressed into small pellets and sintered at high temperatures to form dense ceramics. All ceramic samples were found to be single phase with a rhombohedral structure similar to the undoped (BNT) sample. The measured densities were approximately at least 95% of their theoretical values. This observation was supported by the fact that a very small fraction of porosity was observed in the SEM micrographs of these samples. The grain sizes of Zr-doped BNT were slightly larger than that of the undoped sample. Mechanical properties of Zr-doped and undoped BNT was measured using the Knoop indentation technique. It was found that, in general, the hardness and elastic modulus of BNTZ ceramics increased with increasing zirconium content. The results suggest a way to improve the mechanical properties of BNT ceramics.

Keywords: bismuth sodium titanate, mechanical properties, microstructures, solid solution

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