2019 Volume 52 Issue 2 Pages 239-242
Metal halides are promising ammonia (NH3) absorption/desorption materials for hydrogen energy transport. In this study, a new NH3 carrier material, Ca0.5Sr0.5(NH3)8Cl2, was synthesized, and its crystal structure and NH3 desorption properties were analyzed. The crystal structure of the new material was orthorhombic (space group: Pnma) at 296±2 K, and was similar to those of Ca(NH3)8Cl2 and Sr(NH3)8Cl2. Its crystal volume was intermediate between those of Ca(NH3)8Cl2 and Sr(NH3)8Cl2, and its NH3 desorption equilibrium pressure (490 kPa) was also intermediate between those of Ca(NH3)8Cl2 (583 kPa) and Sr(NH3)8Cl2 (420 kPa) at 342 K. Thus, the NH3 desorption properties of Ca1−xSrx(NH3)8Cl2 may be controlled by varying the value of x.
