CHARACTERIZATION AND MECHANOELECTRICAL PROPERTIES MEASUREMENT OF COMMERCIAL PIEZOELECTRIC CERAMIC MATERIAL FOR ACOUSTIC TRANSDUCER APPLICATION

• Main Author: Kembar Sari (NIM 20503019), Rindang
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/9090
• Institution: Institut Teknologi Bandung

ABSTRACT: <br /> <br /> <br /> This research concern with the characterization and mechanoelectrical properties testing of commercially available piezoelectric ceramic material. The characterization consist of morphological structure analysis using SEM-EDAX and optical microscopy, crystal structure analysis using XRD, hardness measurement using micro-Vickers hardness tester, mechanoelectrical response measurement, and density analysis using liquid pycnometry. The characterization have been carried out to ward two treated of samples, that is ceramic sample which is exposed to HNO3 acid solution for the purpose of eliminating conductive layer of silver and ceramic sample without exposure to with HNO3. Sample construction consist of three parts, that is silver metal conductor, ceramic, and brass or galvanized steel substrate parts. From result of analysis it is implied that: (1) There are very clearly distinct interlayer between the three parts of the sample. For the ceramic sample without exposure to acid, the ceramic part has finer grain size compared to that with conductive coating of silver and brass substrate, but it has a little bit coarser grain size compared to the ceramic sample which is exposed to acid. (2) Content of elements in the sample of piezoelectric ceramic is Zr, Pb, Ti, with Pb having the largest percentage, while the conductive coating comprise of silver (Ag) thin film. (3) Types of piezoelectric ceramic phase without exposure to acid are Ag conductive and PZT phases (Pb(ZrXTii X)O3) with x 0,3 based on the literatures, while sample which is exposed to acid gives only PZT phase. (4) Samples have coefficient of piezoelectricity 17400 x 10-12 C/N. From this value it is estimated that the type of the sample conform to the modified lead zirconate titanate type of ceramics. (5) Hardness of sample obtained is 522 HVN for sample of diameter 4 cm of the acid exposed ceramic sample, 691 HVN for sample diameter of 2,2 cm of the acid exposed ceramic sample, 183 HVN for sample diameter of 2,2 cm of ceramic sample without acid exposure and 235 HVN for sample diameter of 4 cm of ceramic sample without acid exposure. This differences reflect the dissolution of the Ag conductive layer in the nitric acid solution, which is confirmed by the statistical analysis using ANOVA procedure at 95% confidence level. And (6) Density of piezoelectric ceramic sample obtained is 2,7 x 103 kg/m3 which also support that the sample is of PZT type.