| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 674358 | Thermochimica Acta | 2011 | 5 Pages |
Alkaline earth chloroapatites, M10(PO4)6Cl2 (M = Ba, Sr, Ca) were prepared by solid state reaction route and characterized by XRD. The lattice constants of Ba10(PO4)6Cl2, Sr10(PO4)6Cl2, Ca10(PO4)6Cl2 were determined to be a = 10.27(1) Å, c = 7.66(1) Å; a = 9.87(2) Å, c = 7.18(1) Å and a = 9.52(1) Å, c = 6.85(1) Å respectively. The enthalpy increments were measured by inverse drop calorimetric method in the temperature range 523–1423 K using a high temperature calorimeter. Thermodynamic functions such as heat capacity, entropy and Gibbs energy functions in the temperature range 298–1500 K, were computed from the measured enthalpy increments.
► Alkaline earth chloroapatites were prepared and characterized by XRD, AAS & ICP-MS. ► Lattice constants were measured by XRD. Densities derived from XRD data. ► Enthalpy increments were measured from 523–1423 K using a drop calorimeter. ► Thermodynamic functions from 298–1500 K, were determined for the first time.
