MICROSCOPIC STRUCTURE OF LEAD-FREE PIEZOELECTRIC MATERIALS TITANAT BARIUM TITANAT-KALIUM NATRIUM NIOBATE SYNTHESIZED WITH SOLID STATE REACTION

Abstract

Synthesis of piezoelectric ceramic material has been carried out that is environmentally friendlymaterial. The material contains no lead and is a mixture of Bismuth Sodium Titanate (BNT), Barium Titanate (BT) and potassium sodium niobate (KNN) ceramic materials. In this research, BNT-BT-KNN materials were synthesized by using solid-state reaction method. After the synthesis process the material was characterized using XRD and SEM. BNT-BT-KNN ceramic material has the chemical formula of (0.94-y) BNT -0,06BT-yKNN and in this case the value of y varied in the mole percentage of 3%,6%, and 8%. Before being sintered the compound materials were pressed into pelets with a pressure of 3500 psi and then sintered at the suhu of 1000 °C for 4 hours. The X-Ray Diffraction pattern of BNT-BT-KNN has the same form with the diffraction pattern of the one that was done by previous researchers. This indicates that BNT-BT-KNN has formed tetragonal crystal structure with a little peak shift so that it indicates that there is a change in crystal structure to a rhombohedral crystal structure. From the SEM images, it is seen that by adding more KNN the material becomes more porous with the smaller size and more evenly. Keywords: Lead free piezoelectric, BNT, BT, KNN.