Abstract
X-ray, differential thermal analysis, and
dehydration methods have been used to study the magnesium oxychlorides 3Mg(OH)2.MgCl2.8H2O
and 5Mg(OH)2.MgCl2.8H2O
formed at temperatures below 100 �C, and 2Mg(OH), . MgCl2.5H2O
and 9Mg(OH)2.MgCl2.6H2O
formed at temperatures at and above 100 'C. Lower hydrates of the 3-form exist
with 5 and 4 molecules of water, results which differ from those of Feitknecht
and Held (1944), Feitknecht (1953), and Wehner (1933). It 1s not clear from the
new results whether the lower hydrates for the 5-form hare 5 and 3 or 4 and 3
molecules of water, but the latter seems the more likely ; the results of
Feitknecht and Held suggested the former. For the 2- and 9-forms a lower
hydrate with 2 molecules of water exists. In addition all forms have an
anhydrous phase with the crystal structure of Mg(OH)2. The stability
of all phases under natural atmospheric conditions is discussed.
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