Electrodeposition of silicon in molten CaCl2 has been drawing increasing attention. Soluble silicate anions the melt can be reduced and tailored into functional materials. To ensure a precise control electrochemical processes, comprehensive knowledge on soluble is indispensable. Here, we clarify formation behavior by dissolving solid CaSiO3 Ca2SiO4 at temperatures from 1047 K to 1233 (774 °C 96...