ABSTRACT
Ceramic multilayer capacitors (MLCC) are one of the most important electronic components at the surface mounting of electronic circuits. A substantial cost saving can be achieved by utilizing base metal (Ni or Cu) electrode as internal metallization in MLCC over the more expensive precious metals such as Pd or Ag/Pd. ┄┄
In this thesis, the basic modification mechanisms of BaTiO3 have been analyzed. Then novel materials and process are explored and investigated for non-reducible dielectrics.
The main results are as follows:
1.The effects of rare earth elements on the microstructure and dielectric properties of BaTiO3-Mg-R (R=rare earth elementals La, Pr, Ce, Nd, Sm, Gd, Dy, Ho, Er, Yb) system are investigated in detail. ┄┄
2.The effects of various ions on the dielectric properties of the core-shell-structured BaTiO3-Mg-R (R=Yb, Ho) system are studied in detail and the relative mechanisms are discussed. ┄┄
3.The modification mechanisms of 3d elements are investigated in the BaTiO3-Yb-M (M=3d elements Cr, Mn, Fe, Co, Ni, Zn) system. Core-shell structure is found in all the 3d-Yb-codoped samples, resulting in improvement of TCC behavior. ┄┄
4.A novel route has been developed to prepare non-reducible Y5V and X8R materials, in which sol-gel derived complex oxide dopants are applied to ultrafine (Ba,Ca)(Ti,Zr)O3 (BCTZ) or BaTiO3 powders.