Experimental Studies on Characteristics of High-Temperature Syngas Plasma and Magnetohydrodynamic Power Generation

Abstract

The leakage current and the fatigue properties of Pb(Zr, Ti)O 3 (PZT) films prepared by rf-magnetron sputtering on (100)-textured LaNiO 3 electrode were investigated. Sputtering parameters such as excess PbO content in the target, sputtering power, Ar/O 2 ratio, and working pressure were studied. PZT films of the perovskite phase with (100)-preferred orientation can be easily obtained under our sputtering conditions. The optimal sputtering conditions are: 30% excess PbO, sputtering power 40 W, working pressure 5 mTorr, and Ar/O 2 = 95/5. The effect of these sputtering parameters on leakage current and fatigue properties can be explained by the variation of the concentrations of lead vacancies and holes produced by the sputtering conditions. PZT films deposited under these optimal conditions can endure fatigue up to more than 10 11 cycles and possess a low leakage current density (10 −8 -10 −7 A/cm 2 ) at an electric field strength lower than 100 kV/cm. The conduction mechanism of the leakage is proposed to be a Schottky thermionic emission.

Characteristics of sheath-driven tangential flow produced by a low-current DC surface glow discharge plasma actuator

“…The use of gas discharge plasma covers a wide range spanning from the semiconductor industry to the biomedical industry. One of these branches lies in aerospace applications, encompassing plasma thrusters, 1,2) magnetohydrodynamic power generation, 3,4) and plasma-assisted combustion enhancement. 5,6) Aerodynamic flow control, as in separation control, lift enhancement, and drag reduction, has been studied for more than a century and is still an attractive field in fluid dynamics research, with the aim of attaining a practically-applicable flow control mechanism.…”