Some Observations on the Process of Dehydration and Rehydration of Gypsum by Means of Proton Magnetic Resonance

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概要

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• 1) On the thermal dehydration in vacuo, the characteristic single sharp peak of proton resonance was observed for the specimens dehydrated at the temperature from 70 to 150°C.<BR>It is assumed that this single sharp peak is attributed to the zeolitic water probably existing in the space of the crystal lattice of soluble anhydrite and that this zeolitic water can be interpreted as being a part of the water molecules which originate from dihydrate during the thermal decomposition.<BR>2) Calcium sulfate hemihydrate was formed by the rehydration of gypsum dehydrated in vacuo. This hemihydrate showed the proton resonance spectrum corresponding to the signal of three spin type with an intensive center peak. This intensive center peak can be interpreted as an indication of the movable water existing in the space of the crystal lattice of hemihydrate.<BR>3) This hemihydrate was considerably stable under the atmosphere of saturated water vapor. This was ascertained by the NMR measurements.

• 公益社団法人 日本化学会の論文

著者

• Saito Tatsuo

  Government Chemical Industrial Research Institute

関連論文

• Crystal Growth of Magnesium Oxide Prepared by the Thermal Decomposition of Magnesium Hydroxide
• Some Observations on the Process of Dehydration and Rehydration of Gypsum by Means of Proton Magnetic Resonance

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