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Title of Article Microstructural evolution and strongly enhanced dielectric response in Sn-doped CaCu3Ti4O12/CaTiO3 ceramic composites 
Date of Acceptance 16 January 2016 
     Title of Journal Materials Research Bulletin 
     Standard SCOPUS 
     Institute of Journal Elsevier Ltd. 
     Issue 77 
     Year of Publication 2016 
     Page 178–184 
     Abstract Sn4+-doped CaCu3Ti4O12/CaTiO3 composites were prepared using a solid state reaction method employing a simple one-step process. A minor phase of CaTiO3 grains was very well dispersed into the CaCu3Ti4O12 matrix and these two phases were clearly separated from each other in CaTiO3/CaCu3Ti4O12. The grain size of the CaCu3Ti4O12 phase was largely enhanced by Sn4+ doping. Furthermore, CaTiO3 grains were also found inside the enlarged CaCu3Ti4O12 grains. The microstructural evolution can be described based upon liquid phase sintering and the pinning effect by second-phase particles. The dielectric permittivity of Sn4+-doped CaCu3Ti4O12/CaTiO3 was greatly enhanced from 2 103 to 0.6–1.3 104 at103 Hz, while, the dielectric loss tangent was still low. The nonlinear properties were degraded as a main result of microstructural evolution. These results strongly indicated an extrinsic effect upon both of the giant dielectric response and nonlinear properties of CaCu3Ti4O12-based compounds.Ceramics  
     Keyword Ceramics A. Composites, Microstructure, Impedance spectroscopy, Dielectric properties 
577020051-2 Mr. JUTAPOL JUMPATAM [Main Author]
Science Doctoral Degree

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