Beiträge zum thermischen Verhalten von Sulfaten. VI. Zum chemischen Transport von CuSO4, Cu2OSO4 und CuO

Contributions on the Thermal Behaviour of Sulfates. VI. On the Chemical Transport of CuSO₄, Cu₂OSO₄, and CuO A powder of anhydrous CuSO₄ can be prepared by heating CuSO₄ · 5 H₂O in air or in an argon atmosphere. In the same way it is possible to get a powder of Cu₂OSO₄. But up to now, it was difficult to get crystals of CuSO₄ and there was no method known to synthesize crystals of Cu₂OSO₄. Investigations concerning chemical transport reactions of anhydrous heavy metal sulfates showed, that it is possible to get well formed crystals of CuSO₄ and Cu₂OSO₄ by deposition from a vapour phase. As transport agents for CuSO₄, Cl₂ and HgCl₂ are especially suitable. Less appropriate are HCl, NH₄Cl, and I₂. The chemical vapor deposition of Cu₂OSO₄ proceeds well with HgCl₂. In course of these investigations we recognized, that for CuO in addition to the well approved transport agents also Cl₂, HgCl₂ or I₂ (NH₄Cl less suitable) can successfully be used.