| 초록 |
The PMN-PT (1-x)Pb(Mg1/3Nb2/3)O3 - xPbTiO3 solid solution is a well-known relaxor-ferroelectric system because of their high piezoelectric co-efficient(d33~ 2500pm/V). The PMN-PT in the form of single crystal and thin films has been studied for commercial applications in multilayer ceramic capacitors, high-resolution medical imaging, and displacement transducers. Materials Science and Engineering When size of the PMN-PT material reduced to nanoscale, especially to one dimensional nanostructure, it will open up large perspectives of developing nanodevices including sensors and high power nanogenerators. There are only few studies have been conducted on the hydrothermal formation of PMN-PT nanowires. However, the formation mechanism of PMN-PT nanowires has not been fully explained. Here, the possible reaction mechanism for the formation of PMN-PT nanowires was discussed. The ratio of PMN-PT composition is chosen to 65:35, because this region lies near the morphotropic phase boundary (MPB) showing high piezoelectric coefficient due to co-existence of phases. The 0.65PMN-0.35PT nanowires have been synthesized via hydrothermal method using poly-(ethylene glycol)-200 that serves both as solvent and a capping agent. The influences of PEG-200, KOH concentration, and reaction time on phase evolution and morphology of the synthesized powders have been analyzed by XRD, SEM, and TEM. The synthesized PMN-PT nanowires will be used in fabrication of nanogenerator devices; also their output current and voltage will be evaluated. |
