Abstract
Strontium and calcium chloroapatites were synthesized by wet chemical method, characterized by X-ray diffraction and are found to be phase pure materials. The measured room temperature lattice parameter of Ca 10(PO 4) 6Cl 2 is a = 9.523 Å, c = 6.855 Å and for Sr 10(PO 4) 6Cl 2 is a = 9.876 Å, c = 7.188 Å. Heat capacity measurements were carried out on Ca 10(PO 4) 6Cl 2 and Sr 10(PO 4) 6Cl 2 by DSC in the temperature range 298–800 K. The heat capacity values of Sr 10(PO 4) 6Cl 2 is higher at all temperatures than Ca 10(PO 4) 6Cl 2. Enthalpy and entropy increments were computed. Heat capacity values of Ca 10(PO 4) 6Cl 2 and Sr 10(PO 4) 6Cl 2 at 298 K are 758 and 868 J K −1 mol −1, respectively.
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