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Volume 47S Number 1

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Research articles

ScienceAsia 47S (2021): 34-41 |doi: 10.2306/scienceasia1513-1874.2021.S005


Effects of processing parameter on energy storage density and ferroelectric properties of lead-free bismuth sodium titanate-strontium bismuth titanate ceramics


Kamonporn Saenkama,b, Pharatree Jaitaa,c, Somnuk Sirisoonthornd, Tawee Tunkasiria,e, Gobwute Rujijangula,c,e,f,*

 
ABSTRACT:     In order to clarify the optimal sintering conditions, the effects of processing parameter on phase evolution, physical, microstructure, dielectric, ferroelectric, and energy storage density properties of bismuth sodium titanate-strontium bismuth titanate ceramics (or BNT-SBT) were investigated. The studied ceramics were fabricated via a conventional mixed oxide method and sintered at temperatures ranging from 11001175 °C under normal atmosphere for 3 h dwell time with a heating/cooling rate of 5 °C/min. The XRD data revealed that the coexisting rhombohedral and tetragonal phases were observed in all of the ceramics. With increasing sintering temperature, the cubic-rich phase was dominated; and the average grain size tended to increase. For the ceramics sintered at 1150 °C, the good density (5.74 g/cm3), dielectric (εmax = 3510, tan δ = 0.0501, TF-R = 73.80 °C, Tm = 273 °C), and ferroelectric (Pr = 3.05 µC/cm2, Ec = 7.69 kV/cm) were obtained. In addition, the obtimum sintering temperature of 1150 °C was also found to improve the energy storage density properties (W = 0.94 J/cm3, η = 89.93% at 125 °C, and E = Emax). KEYWORDS: sintering temperature, lead-free ceramics, dielectric and ferroelectric properties, energy storage density

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a Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand
b Graduate School, Chiang Mai University, Chiang Mai 50200 Thailand
c Science and Technology Research Institute, Chiang Mai University, Chiang Mai 50200 Thailand
d National Metal and Materials Technology Center, Thailand Science Park, Pathum Thani 12120 Thailand
e Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand
f Research Center in Physics and Astronomy, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand

* Corresponding author, E-mail: rujijanagul@yahoo.com

Received 10 Nov 2020, Accepted 16 Apr 2021