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Full-Text Articles in Engineering Science and Materials

Design And Development Of High-Performance Lead-Free Piezoelectric Ceramics, Xiaoming Liu Jan 2015

Design And Development Of High-Performance Lead-Free Piezoelectric Ceramics, Xiaoming Liu

Graduate Theses and Dissertations

Piezoelectric ceramics have been widely used in the commercial applications of actuators, sensors, etc. Nowadays, Pb(Zr,Ti)O3-based (PZT) ceramics, which contain ≥ 60 wt.% of lead, dominate the market due to their excellent electromechanical properties. The large electric field induced polarization and strain developed in PZT piezoceramics are intimately related to the morphotropic phase boundary (MPB). This has been attributed to the coexistence of tetragonal and rhombohedral perovskite phases. However, toxic lead severely threatens the environment and human health, as a significant amount of lead is released into the air during the fabrication and disposal. Thus, there is an ...


In-Situ Tem Plasma Chip Nanofabrication And Characterization, Xuebo Cui Jan 2014

In-Situ Tem Plasma Chip Nanofabrication And Characterization, Xuebo Cui

Dissertations, Master's Theses and Master's Reports - Open

A silicon-based microcell was fabricated with the potential for use in in-situ transmission electron microscopy (TEM) of materials under plasma processing. The microcell consisted of 50 nm-thick film of silicon nitride observation window with 60μm distance between two electrodes. E-beam scattering Mont Carlo simulation showed that the silicon nitride thin film would have very low scattering effect on TEM primary electron beam accelerated at 200 keV. Only 4.7% of primary electrons were scattered by silicon nitride thin film and the Ar gas (60 μm thick at 1 atm pressure) filling the space between silicon nitride films. Theoretical calculation also ...