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The Effects of Annealing Process on Dielectric and Piezoelectric Properties of BMT-Base Lead-Free Ceramics

World Journal of Nano Science and Engineering 2013年第3期3卷 100-107页

作者： mahdi ghasemifard Meisam Daneshvar Misagh Ghamari Department of Physisc (Electroceramics Laboratory) Shahid Beheshti University Tehran Iran Nanotechnology Laboratory Esfarayen University Esfarayen Iran

By using nitric acid as the fuel, the lead-free ceramic of Ba(Ti1-x,Mgx)O3 (x = 0.31) was prepared by auto combustion method (ACM). To make a comparison, this ceramic was also prepared using mixed oxide method (MOM). By X-ray diffraction, the phase structures of two samples were studied, and the results showed that rising temperatures would reduce unwanted phases. The piezoelectric and electrical properties as a function of calcination and sintering temperatures were investigated. The results showed that the outstanding electrical properties were obtained for nanoceramic with this composition. The SEM image of the grain size was estimated around 2 micrometers, and the grain size increased with the increasing of sintering temperature for two samples. The curie temperature of the BMT-ACM was 126°C and it’s significantly larger than the curie temperature of BMT-MOM which was 118°C. The results of electrical properties emphasized that the synthesis optimum temperature for two samples was about 1200°C and it was the best temperature that led to improved properties such as dielectric constant, polarization and piezoelectric coefficients.

关键词： Dielectric Properties Batio3 and Titanates Capacitors

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Effects of Pb-Doping on Phase Structural and Optical Properties of CdZnS Nano-Powders

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Journal of Electronic Science and Technology 2013年第3期11卷 322-328页

作者： mahdi ghasemifard Somayeh Tohidi Roholah Karimzadeh the Nano Technology Lab Esfarayen University the Department of physics Shahid Beheshti University

Cadmium zinc lead sulfide [Cd0.8（Zn1-x7,Pbx）0.2S] nano-powders were prepared by an improved coprecipitation method. The effect of Pb2＋ concentration at 500℃ on the phase and crystalline structure of the Cd0.8（Zn1-x7,Pbx）0.2S powders were investigated by X-ray diffraction （XRD）. According to the transmission electron microscopy （TEM） images, the particles size are in the range of 58 nm to 72 nm. In addition, optical band gap energy and optical constants of nano-powders were determined using the ultraviolet （UV） spectrum, Fournier transform infrared spectroscopy （FTIR）, and Kramers-Kronig analysis, respectively. We calculate the refractive index n, extinction coefficient k, and dielectric function t as a function of the wavenumber. The experiment results demonstrate that the amount of Pb＋2 has been playing an increasingly important role on optical properties of CZPS nanocrystals.

关键词： Index Terms-Coprecipitation Kramers-Kroniganalysis optical constants X-ray diffraction.

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