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Papers by Author: Yi Chi Zhang

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Preparation and Characterization of Monodispersed BaTiO₃ Nanocrystals Using One-Step Solvothermal Method

Authors: Hui Zhang, Xiao Hui Wang, Zhi Bin Tian, Cai Fu Zhong, Yi Chi Zhang, Chang Ku Sun, Long Tu Li

Abstract: A convenient one-step solvothermal method has been developed to synthesize monodispersed barium titanate nanocrystals with an average size of 5 nm. The key point of this method is the controlling of hydrolysis of Ti (OC₄H₉)₄ with Diethylene glycol (DEG). The as-prepared BaTiO₃ nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), FT-IR and TG/DTA analysis. The monodispersed BaTiO₃ nanoparticles obtained by this method have an average size of 5 nm with a narrow size distribution and a lattice tetragonality of 1.0069, which is promising for the ferroelectric science and its industry application.

Effects of Processing on Microstructure and Dielectric Properties of Ultrafine- Grained Barium Titanate Based Ceramics for BME-MLCC Applications

Authors: Tian Wang, Xiao Hui Wang, Guo Feng Yao, Yi Chi Zhang, Xun Xun Liao, Gang Yang, Tae Ho Song, Long Tu Li

Abstract: Ultrafine-grained ceramics based on nano-scale barium titanate for BME-MLCC applications have been prepared. Relationships of milling time, microstructures and dielectric properties have been investigated. With processing selected carefully, the present ceramics show ultrafine grain size (180nm) and homogeneous microstructures, well with high dielectric constant (ε25=2550), low dielectric loss (<0.02), high resistivity, high breakdown field and X7R temperature specifications, which would be promising materials for the next generation BME-MLCC applications.