Chlorellestadite in the preheater system of cement kilns as an indicator of HCl formation

The structure model for synthetic chlorellestadite, used in the quantitative X-ray phase analysis, was refined by the full profile Rietveld method using the powder X-ray diffraction spectrum (CuKα1). Crystal data: hexagonal, space group P63/m, a=9.6773(3) Å, c=6.8585(1) Å, Z=1. A disordered S/Si distribution was observed.