Synthesis of (Ca_1-xSr_x)_2-2y](Ti _2-2yLi_2y)Si_2yO_6-y ceramic and its application in efficient plasma decomposition of CO₂

According to both the first principle and materials chemistry, a method for fabricating [(Ca_1-xSr_x)_2-2y](Ti _2-2yLi_2y)Si_2yO_6-y ceramic was investigated. It was considered that the sintering was promoted by self-accelerated diffusion due to the formation of point defects caused by doping with Li₂Si₂O₅. Consequently, a concept of non-stoichiometrically activated sintering, which was enhanced by point defects without the help of a grain boundary phase, was systematically studied in the Ca_1-xSr_xTiO_3-Li₂Si ₂O₅ system. The mechanical and dielectric properties of [(Ca_1-xSr_x)_2-2y](Ti_2-2yLi _2y)Si_2yO_6-y were greatly enhanced by adding Li₂Si₂O₅. To improve CO₂ decomposition activity, [(Ca_1-xSr_x)_2-2y] (Ti_2-2yLi_2y)Si_2yO_6-y, which possesses both high permittivity and high dielectric strength was used as a dielectric barrier to decompose CO₂ by dielectric barrier discharges (DBDs) plasma without using any catalyst and auxiliary substance. It successfully generated DBDs plasma and the CO₂ conversion was much higher than that using an alumina or a silica glass barrier which was widely used as the dielectric barrier in previous studies.