Crystallographic data for new phases in the CaSO3-H2O system.
スポンサーリンク
概要
- 論文の詳細を見る
Among the three modifications of calcium sulfite hemihydrate, two of them, hexagonal β-CaSO<SUB>3</SUB>·1/2H<SUB>2</SUB>O with a rhombohedral lattice and γ-CaSO<SUB>3</SUB>·1/2H<SUB>2</SUB>O with a simple triangular hexagonal lattice, were found in the authors' recent work. By heating α- and/or γ-hemihydrate at 330–360 °C in a nitrogen atmosphere, the orthorhombic anhydrate α-CaSO<SUB>3</SUB> was formed, with lattice constants of 6.472, 15.93, and 23.44 Å for <I>a</I>, <I>b</I>, and <I>c</I> respectively, while the body-centered tetragonal anhydrate β-CaSO<SUB>3</SUB>, with lattice constants of 15.68 and 19.44 Å for <I>a</I> and <I>c</I> respectively, was formed by heating the β-hemihydrate. The dehydration of three hemihydrates and the hydration of two anhydrates were discussed. The phase relationships in the CaSO<SUB>3</SUB>–H2O system were summarized as follows:<BR>α-CaSO<SUB>3</SUB>·1⁄2H<SUB>2</SUB>O\oversetDehydration (360°C)\undersetHydration(30°C)\rightleftarrowsα-CaSO<SUB>3</SUB>+1⁄2H<SUB>2</SUB>O;<BR>β-CaSO<SUB>3</SUB>·1⁄2H<SUB>2</SUB>O\oversetDehydration (360°C)\undersetHydration (30°C)\rightleftarrowsβ-CaSO<SUB>3</SUB>+1⁄2H<SUB>2</SUB>O;<BR>γ-CaSO<SUB>3</SUB>·1⁄2H<SUB>2</SUB>O\xrightarrowDehydration (330°C)α-CaSO<SUB>2</SUB>+1⁄2H<SUB>2</SUB>O;<BR>γ-CaSO<SUB>3</SUB>·1⁄2H<SUB>2</SUB>O\xrightarrowTransformation (in water at 20°C)<BR>β-CaSO<SUB>3</SUB>·1⁄2H<SUB>2</SUB>OO\xrightarrowTransformation (in water at 20°C)α-CaSO<SUB>3</SUB>·1⁄2H<SUB>2</SUB>O.
- 公益社団法人 日本化学会の論文
著者
-
Arai Yasuo
Department Of Nuclear Energy System Japan Atomic Energy Research Institute
-
Nagata Norifumi
Department of Industrial Chemistry, Faculty of Science and Engineering, Nihon University
-
Yasue Tamotsu
Department of Industrial Chemistry, Faculty of Science and Engineering, Nihon University
-
Shiino Hiroaki
Department of Industrial Chemistry, Faculty of Science and Engineering, Nihon University
関連論文
- Anisotropic Superconducting Gap in Transuranium Superconductor PuRhGa_5 : Ga NQR Study on a Single Crystal(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- First Observation of de Haas-van Alphen Effect in PuIn_3(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Single Crystal Growth and Anisotropic Superconducting Property of PuRhGa_5(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Electrode Reaction of Pu^/Pu Couple in LiCl-KCl Eutectic Melts: Comparison of the Electrode Reaction at the Surface of Liquid Bi with That at a Solid Mo Electrode
- Recovery of Neptunium by Electrolysis of NpN in LiCl-KCl Eutectic Melts
- Vaporization Behavior of BaPuO3 (高温質量分析特集号)
- Reduction of the Neutron-Induced Background Using a Pulse-Type Beam Chopper in an ISOL Experiment
- Crystallographic data for new phases in the CaSO3-H2O system.
- Mechanism of carbothermic reduction of (U,Pu)O2 to (U,Pu)C.