Structural Analysis of Molten Na_2BeF_4 and NaBeF_3 by X-ray Diffraction(Materials, Metallurgy, Weldability)
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概要
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The structures of molten Na_2BeF_4 (650±10℃) and NaBeF_3 (470±5℃) have been investigated by X-ray diffraction structural analysis. It is shown that BeF_4 tetrahedra existing in the crystalline state persist as the fundamental structural unit in the molten state. Molten Na_2BeF_4 contains mainly monomeric <BeF_4>^<2-> with four unshared F^- corners. A configuration for two Na^+ cations around a BeF_4 tetrahedron is suggested for molten Na_2BeF_4. In molten NaBeF_3, dimeric <Be_2F_7>^<3-> with one shared F^- corner common to two BeF_4 tetrahedra appears. By comparison of the observed radial distribution functions D(r) of molten NaBeF_3 and CaSiO_3, it is conclued that both the chemicals have essentially the same structure.
- 大阪大学の論文
著者
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IWAMOTO Nobuya
Osaka University
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Ohno H
Jaeri-riken Spring-8 Project Team
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Ohno Hideo
Molten Material Laboratory Division Of Nuclear Fuel Research Japan Atomic Energy Research Institute
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UMESAKI Norimasa
Osaka University
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Umesaki Norimasa
Osaka National Research Institute Aist-miti
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Umesaki Norimasa
Osaka National Research Institute (onri) Aist
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Furukawa Kazuo
Molten Material Laboratory Division Of Nuclear Fuel Research Japan Atomic Energy Research Institute
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Furukawa K
Osaka University:(present Office)mitsubishi Metal Co.
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