Abstract: | Contributions on the Thermal Behaviour of Sulphates. XVI. The Chemical Vapour Transport of Ga2(SO4)3 with Cl2 and HCl. Experimental Results and Calculations Crystals of anhydrous Ga2(SO4)3 can be grown by means of CVT (e. g. 525°C → 475°C) in the less hot region of a closed silica ampoule. We investigated the dependance of the deposition rate on the concentration of the transport agent (Cl2, HCl) and the transport temperature (475°C ≤ T ≤ 750°C; T2 > T1; ΔT = 50°C; T = 0.5(T1 + T2)). Experimental results and thermodynamic calculations on the basis of ΔFH (Ga2(SO4)3) = ?686.5 kcal/mol show a good agreement. |