Study of Nanoscale Polarization and Switching in PZT Ferroelectrics

• Main Authors: Kai-Hung Chung, 張凱勛
• Other Authors: Yi-Chun Chen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/27983128286386652763

碩士 === 國立成功大學 === 物理學系碩博士班 === 94 === In this study, nano-scale ferroelectric properties, including polarization and domain switching, were investigated by scanning probe microscopy (SPM). PZT (Pb(ZrTi)O3) thin films, which were synthesized by metal-organic decomposition, and 1-D PZT nanotubes, which were prepared by template-based method, were tested samples. Thin films annealed at higher　temperature (>600℃) will possess preferred orientation and better crystalline phases. The SPM results show that nano- ferroelectricity is strongly related to the crystal structures. While a dc voltage was applied between the film and SPM tip, higher saturation polarization was induced on the grains with (001) preferred orientation. Moreover, the ferroelectric hysteresis of the films with worse crystaline phase shows bias shift. Ferroelectric hollow tubes of diameters about 150 nm and wall thickness about 10 nm were successfully synthesized and also investigated in this study. The tubes are mainly poly crystallization. Due to the narrow constriction of the tube-wall on the grain size and domains, ferroelectric tubes have weak ferroelectric polarization and serious hysteresis shift.