Abstract
Crystals of some elements (Au, Ag, Pt, Co, Ni, Te, As) have been grown hydrothermally. Since strong acids were used as solvents, the experiments were performed in sealed quartz glass ampoules. Bursting of the ampoules was avoided by maintaining a sufficiently high outside pressure of carbon dioxide. The deposition of gold crystals was investigated more extensively in the temperature region between 300 and 500°C. Gold crystals grow from acid solutions containing Cl -, Br - or I - ions. In the case of chloride and bromide solutions oxidizing agents (Cl 2, Br 2, H 2O 2) must be present. The experiments are discussed by reference to thermodynamic calculations of the probable solution reactions.
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