書誌事項
- タイトル別名
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- Morphological Controls of Calcium Carbonate Hexahydrate and Its Dehydrating Substance
- タンサン カルシウム 6 スイワブツ ト ソノ ダッスイブツ ノ ケイタイ セ
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The morphological control of calcium carbonate hexahydrate and its dehydrate was investigated. Synthetic calcium carbonates were characterized by means of X-ray diffraction pattern, thermal analysis (TG-DTA), infrared spectrum and scanning electron microscopic observation. The hexahydrate was synthesized by aging amorphous calcium carbonate which formed by adding aqueous ammonia into calcium hydrogen carbonate solution at 0-9°C. The crystal shape and particle size of the hexahydrate were remarkably affected by synthetic conditions such as temperature (0-9°C), calcium ion concentration (2.94-11.34×10-3mol·dm-3) and stirring speed (150-250rpm). For example, the particle size of hexahydrate having hexagonal platelike crystals was controlled to approximately 5-25μm below 3°C. The hexahydrate unstable above room temperature was easily changed to spherical vaterite at 30-60°C and to needlelike aragonite above 90°C by dipping the hexahydrate in water at 30-100°C. Moreover, an amorphous calcium carbonate hydrate containing 5% methoxyl group in skeleton structure of original hexagonal platelike particles was formed by dipping the hexahydrate in methanol for 1min. This compound was converted to hexagonal platelike calcite by heating at 300°C.
収録刊行物
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- Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)
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Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) 103 (1204), 1282-1288, 1995
公益社団法人 日本セラミックス協会
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詳細情報 詳細情報について
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- CRID
- 1390001205277109120
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- NII論文ID
- 110002291294
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- NII書誌ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL書誌ID
- 3640397
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