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Research articles

ScienceAsia 37 (2011): 256-261 |doi: 10.2306/scienceasia1513-1874.2011.37.256


Densification of Bi0.5Na0.5ZrO3 ceramic using liquid-phase sintering method


Panupong Jaibana, Sukanda Jiansirisomboona,b, Anucha Watcharapasorna,b,*

 
ABSTRACT:     Lead-free bismuth sodium zirconate (BNZ) ceramics with formula Na0.5Bi0.5ZrO3/xBi2O3 with x=0, 2, 3, 4, and 6 wt% were prepared by liquid-phase sintering method. The specimens were sintered at 850 and 900 °C. Phase identification was investigated using X-ray diffraction technique. BNZ/4 wt% Bi2O3 and BNZ/6 wt% Bi2O3 ceramics sintered at 900 °C showed impurity phase of Bi7.38Zr0.62O12.31 compound due to excess additive reacted with zirconium in system. Scanning electron microscopy and energy-dispersive X-ray spectroscopy were employed to study microstructure and measure chemical composition of ceramics, respectively. The results revealed creation of bismuth oxide liquid phase at BNZ grain boundaries inhibited grain growth and decreased pore size. This caused the relative densities of the modified samples to increase.

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a Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
b Materials Science Research Centre, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand

* Corresponding author, E-mail: anucha@stanfordalumni.org

Received 14 Mar 2011, Accepted 31 Aug 2011