화학공학소재연구정보센터
Applied Surface Science, Vol.190, No.1-4, 416-421, 2002
Phase transition and dielectric characteristics of nano-grained BaTiO3 ceramics synthesized from surface-coated nano-powders
Nano-gained BaTiO3 (BTO) ceramics were synthesized by pressureless sintering BTO nano-powders coated with Mn materials. The BTO ceramics, which were prepared at 800 degreesC 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 degreesC, 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. (C) 2002 Elsevier Science B.V. All rights reserved.