TRANSFORMATIONS OF ICE VI AND ICE VII AT ATMOSPHERIC PRESSURE

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Abstract
The irreversible transformations that occur when ices VI and VII are heated at atmospheric pressure from liquid-nitrogen temperature have been examined by simple thermal analysis and by X-ray diffraction. They transform first to cubic ice I (ice Ic) which subsequently transforms to hexagonal ice I (ice Ih). The rates of transformation depend on the temperature. The heat evolved is 16 ± ~2 cal/g for ice VI and 31 ± ~4 cal/g for ice VII.

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