Abstract
A CaCl 2·6H 2O composition with a slight excess of water was found very stable on repeated phase change (over 1000 cycles) in a heat cycle test (35 ∼ 18°C), using vertical glass tubes of 950 mm height. The mole ratio of water CaCl 2 , n, was 6.11, less than that of the peritectic composition ( n = 6.14). Dissolved NaCl had superior nucleating ability to that of common barium salts under certain experimental conditions. This result was attributed to a “memory effect”. The dissolved NaCl decreased the heat of vaporization of water about 15 per cent. NaF had a similar effect to that of NaCl, because NaF powder reacted with CaCl 2 in solution yielding NaCl and CaF 2. A brief discussion of CaCl 2·4H 2O formation is presented.
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