Direct synthesis of H−-encaged 12CaO·7Al2O3 crystals by high-pressure processes

Recent progress and prospects in active anion-bearing C12A7-mediated chemical reactions

“…The H − ion concentration can reach the theoretical maximum of 2.3 × 10 21 cm −3 when C12A7 was annealed with CaH 2 at 800 °C for 120 h. 13 The direct synthesis of C12A7:H − is achieved by a solid-state reaction under high pressure. 102 The reducing atmosphere is important for preventing the unintended incorporation of impurity ions, such as O 2− and OH − ions. The high-pressure apparatus can provide a sealed environment for the reaction of the starting materials under reductive conditions.…”

A simplified and facile preparation method for the [Ca24Al28O64]4+(e−)4 electride

“…Inoue et al used CaH 2 to reduce C12A7:O 2− in a vacuum-sealed system, 15 and Miyakawa et al used CaH 2 as a raw material to directly synthesize C12A7:H − in a closed system at high-pressure. 16 Here, we used powdery CaH 2 instead of Ca metal shot as the reducing agent in an open system, which simplified the preparation process considerably (as shown in Table 1ght). This change offers many benefits for the large-scale production of C12A7:e − .…”