Preparation of Core-Shell BaTiO_3 Particles Coated with MgO

概要

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MgO is a well-known additive to BaTiO3 powder for MLCC application. A nano-coating process was investigated to produce an MgO shell layer onto BaTiO3 core powder. Several deposition reaction routes were examined to find out that a magnesium nitrate-urea system worked very well, if not the best. The solution-state reaction gave Mg5(CO3)4(OH)2·4H2O as confirmed by XRD, which later turned to MgO upon calcination at 600°C. The core-shell morphology was characterized using SEM and TEM whereas the composition of the shell layer was determined via ICP-AES and XRF. The composition of the MgO shell layer was rather easily controlled by adjusting initial amounts of reactants.
社団法人化学工学会の論文
2005-08-01