|
|||||
|
|
Phase transition and dielectric characteristics of nano-grained BaTiO3 ceramics synthesized from surface-coated nano-powders |
|
| Authors: | M -B Park C -D Kim S -K Lee N -H Cho |
| Institution: | a Department of Materials Science and Engineering, Inha University, Inchon 402-751, South Korea b Division of Ceramics, Korea Institute of Science and Technology, Seoul 136-791, South Korea c Department of Chemical Engineering, Sogang University, Seoul 121-741, South Korea |
| Abstract: | Nano-grained BaTiO3 (BTO) ceramics were synthesized by pressureless sintering BTO nano-powders coated with Mn materials. The BTO ceramics, which were prepared at 800 °C from nano-powders of 40 nm size, are of a cubic structure with a small fraction of tetragonal phase, similar to that of the starting BTO nano-powders of the same size. On the other hand, the BTO ceramics with about grains of 1300 nm size, which were prepared at sintering temperature ranging from 1100 to 1200 °C, have a mainly tetragonal phase. By increasing the sintering temperature and/or the amount of the coating materials, the crystallinity of the tetragonal phase was increased. The relation of the dielectric features of the nano-grained BTO ceramics with the structural variation is discussed in terms of process parameters. |
| Keywords: | BaTiO3 Nano-powder Nano-grained ceramics Crystal phase Grain boundary |
| 本文献已被 ScienceDirect 等数据库收录！ | |