(NH4)2SiF6 evaporation in the presence of SiO2

Silica materials recovered from photonic industrial waste powder: Its extraction, modification, characterization and application

“…3b. Mel'nichenko et al [17] investigated the mechanism of the solid-phase reaction between (NH 4 ) 2 SiF 6 and SiO 2 , and proposed that (NH 4 ) 2 SiF 6 could be thermally decomposed between 220 and 300 • C in the presence of SiO 2 . Generally, the following chemical reactions are expected to take place when (NH 4 ) 2 SiF 6 was heated up to 900 • C [16]:…”