Nanoparticles
Preparation of Core-Shell BaTiO3 Particles Coated with MgO
2005 Volume 38 Issue 8 Pages 553-557
Details
2005 Volume 38 Issue 8 Pages 553-557
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.
