Applying Solid State Defect Chemistry and First Principle to Design Sintering of Li₂Si₂O₅ Doped Ca_1-xSr_xTiO₃

抄録

On the basis of solid state defect chemistry, a nonstoichiometrical compound of [(Ca1-xSrx)2-2yX2y](Ti2-2yLi2y)Si2yO6-yXy ( X vacancy ) may be evolved by alloying Li2Si2O5, CaTiO3 and SrTiO3. According to the first principle, an ionic/atom diffusivity is proportional to concentration of the vacancy. In this vein, mixed powders of Li2Si2O5, CaTiO3 and SrTiO3.and alloyed powders of [(Ca1-xSrx)2-2yX2y](Ti2-2yLi2y)Si2yO6-yXy were sintered by pressureless sintering and spark plasma sintering to evidence the above-mentioned arguments. All the results demonstrated a novel concept of nonstoichiometrically activated sintering, which is enhanced by point defects without the help of a grain boundary phase.