SYNTHESIS AND CHARACTERIZATION OF LEAD-FREE PIEZOELECTRIC (K0.5Na0.5)NbO3 PRODUCED WITH IMPROVED CALCINATION TEMPERATURE

Nor Amalina Ahmad; Dzetty Soraya Abdul Aziz; Norni Hidayawati Mat Daud; Rahim Noor; Amir Azam Khan

doi:10.11113/jt.v82.13992

Authors

Nor Amalina Ahmad Centre for Pre-University Study, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
Dzetty Soraya Abdul Aziz Centre for Pre-University Study, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
Norni Hidayawati Mat Daud Centre for Pre-University Study, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
Rahim Noor Faculty of Engineering, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
Amir Azam Khan Faculty of Engineering, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia

DOI:

https://doi.org/10.11113/jt.v82.13992

Keywords:

Lead-free piezoelectric, KNN, perovskites, sintering, microstructure

Abstract

Potassium sodium niobate (KNN) is one of the lead free piezoelectric material that catch the attention of researchers and also those in the industrial field because of its stable piezoelectric responses and environmental friendly composition. The recent development of KNN shows that many methods have been used to synthesize the KNN but the stoichiometric Ka_0.5Na_0.5NbO₃composition is extremely difficult to consolidate. One of the ways to overcome the problem is to precisely pre-calcine and use milling process for proper homogenization followed by natural sintering process. In this paper, attempt has been made to synthesize the KNN produced at 750 ^oC calcination temperature. The results of 1060^oC sintering temperature for 2 hours show a good composition of KNN with orthorhombic crystal structure where the final sintered pellet can reach to a relative density up to 87.13 %.

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