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The effects of temperature, cooling rate, and solution concentration on the spontaneous crystallization of Na2SO4·7H2O and Na2SeO4·7.5H2O from their supersaturated solutions was studied. It was found that the crystallization of Na2SO4·7H2O almost always occurs prior to that of Na2SO4·10H2O (except at high cooling rates), while the crystallization of Na2SeO4·7.5H2O is rather hindered. Raman spectroscopic...
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