Proceeding2562

1275 การประชุมวิชาการระดับชาติมหาวิทยาลัยทักษิณ ครั้งที่ 29 ประจ�ำปี 2562 วิจัยและนวัตกรรมเพื่อการพัฒนาที่ยั่งยืน Physical Properties of Bismuth Sodium Titanate Ceramics Doped with Neodymium Oxide Manutsanun Boonyanuwat 1 Pawanrat Kanarat 1 and Chontira Sangsubun 2* Abstract Introduction : Bismuth sodium titanate ceramics is a piezoelectric materials that shows a marked piezoelectric effect, meaning that the direct piezoelectric effect is defined as the ability of a material to produce voltage under tension or compression. The converse effect is defined as the bending caused in piezoelectric materials, due to applied potential or electric field. Recently, piezoelectric materials are suitable for an electric device such as capacitors, sensors and actuators. This research studies the physical properties of Bismuth sodium tita- nate doped with neodymium oxide ((BNT/Nd 2 O 3 ). Objective : To investigate the physical properties of bismuth sodium titanate ceramics doped with neodymium oxide. Methods : The Bi 0.5 Na 0.5 TiO 3 /xNd 2 O 3 : BNT/xNd powders using x = 0.5, 1 and 1.5 wt%, respectively were synthe- sized via high-energy ball milling by a mixed–oxide process. This calcined at 750°C. After that, the BNT/xNd powders were then pressed and sintered at 1100°C. Further ceramics were investigated in terms of physical properties. Results : The results show that the particle size of BNT/xNd powders using high-energy ball milling method was 80 to 200 nm. The particle size of BNT/xNd powders was 90 to 500 nm at the calcination temperature of 750°C. The BNT/xNd ceramics are rhombohedral phases by sintering at 1100°C. Conclusion : The grain size of BNT/xNd ceramics tended to increase when added neodymium oxide at x = 0.5-1.5 wt%. The relative density of the ceramics was found to be higher than 95% of the theoretical density at an addition of x = 1 and 1.5 wt%. Keywords : Bismuth sodium titanate, Neodymiumoxide, Physical properties.