Mehdi Hejazi

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BiFeO<sub>3</sub> (BFO) has stimulated a great interest in recent years for its room temperature multiferroic behavior with very high remnant polarization. However, the leakage current of BFO films is very high. To lower the leakage current, we have developed thin films with following target compositions on SrRuO<sub>3</sub> buffered on SrTiO<sub>3</sub>(More)
We have studied the effect of deposition parameters on the microstructure, crystallinity, and ferroelectric properties of 0.88(Bi(0.5)Na(0.5))TiO(3)-0.08(Bi(0.5)K(0.5))TiO(3)¿0.04BaTiO(3) thin films grown on SrRuO(3)-coated SrTiO(3) substrates by pulsed laser deposition. The parameters studied were the repetition rates, substrate temperatures, oxygen(More)
This paper discusses the fabrication and characterization of a single element ultrasonic transducer with a lead-free piezoelectric active element. A piezoelectric ceramic with composition of 0.88Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-0.08Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub>-0.04Bi<sub>0.5</sub>Li<sub>0.5</sub>TiO<sub>3</sub> was chosen as(More)
This paper discusses the fabrication and characterization of a single-element ultrasonic transducer with a lead-free piezoelectric active element. A piezoelectric ceramic with composition of 0.88Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>&#x2013;0.08Bi<sub>0.5</sub>K<sub>0.5</sub>TiO<sub>3</sub>&#x2013;(More)
We have studied the effect of deposition parameters on the microstructure, crystallinity, and ferroelectric properties of 0.88(Bi<sub>0.5</sub>Na<sub>0.5</sub>)TiO<sub>3</sub>-0.08(Bi<sub>0.5</sub>K<sub>0.5</sub>)TiO<sub>3</sub>-0.04BaTiO<sub>3</sub> thin films grown on SrRuO<sub>3</sub>-coated SrTiO<sub>3</sub> substrates by pulsed laser deposition. The(More)
We have studied the effect of deposition parameters on the microstructure and ferroelectric properties of pulsed laser deposited 0.88(Bi<inf>0.5</inf>Na<inf>0.5</inf>)TiO<inf>3</inf>-0.08(Bi<inf>0.5</inf>K<inf>0.5</inf>)TiO<inf>3</inf>-0.04BaTiO<inf>3</inf> thin films on SrRuO<inf>3</inf> coated SrTiO<inf>3</inf> substrates. The films were deposited at(More)
MO3 (M = Mo, W) or VI-VI binary compounds are important semiconducting oxides that show great promise for a variety of applications. In an effort to tune and enhance their properties in a systematic manner we have applied a designing strategy to deliberately introduce organic linker molecules in these perovskite-like crystal lattices. This approach has led(More)
We have studied the effect of laser repetition rate on the microstructure, crystallographic orientation, dielectric and ferroelectric properties of pulsed laser deposited 0.94(Bi<inf>0.5</inf>Na<inf>0.5</inf>)TiO<inf>3</inf>-0.04(Bi<inf>0.5</inf>K<inf>0.5</inf>)TiO<inf>3</inf>-0.02BaTiO<inf>3</inf> thin films on SrRuO<inf>3</inf> coated SrTiO<inf>3</inf>(More)
A recently proposed curvelet transform is a multi-scale multi-direction transform which provides sparse representation of two dimensional signals with smooth curve linear discontinuity. In seismic processing, several methods were proposed based on curvelet transform to eliminate coherent noises such as ground roll from seismic data. All of these methods(More)
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