Thermal analysis on the Li-Mg-B-H systems

Tessui Nakagawa, Takayuki Ichikawa, Nobuko Hanada, Yoshitsugu Kojima, Hironobu Fujii

研究成果: Article

79 引用 (Scopus)

抄録

Thermal analyses of the mixture of MgH2 and LiBH4 doped with TiCl3, and each element MgH2 or LiBH4 doped with TiCl3 were performed under an inert gas flow and 0.5 MPa H2-gas conditions. It was indicated that the hydrogen desorption reaction of MgH2 + 2LiBH4 to MgB2 + 2LiH + 4H2 phases proceeded at temperature above 400 °C under 0.5 MPa hydrogen, whereas, under an inert gas atmosphere, the reaction of the same mixture was transformed into Mg + 2B + 2LiH + 4H2 phases in a temperature range from 350 to 430 °C. Before these reactions, the dehydrogenation of MgH2 and the melting of LiBH4 took place under both hydrogen and the inert gas atmospheres with increasing temperature. In addition, the molten LiBH4 did not decompose into LiH, B and H2 below 450 °C under 1 MPa H2, while the LiBH4 decomposed even below 450 °C under an inert gas atmosphere. From these results, it is deduced that the reaction producing MgB2 is a solid-liquid reaction between solid Mg and liquid LiBH4 above 400 °C without decomposition of molten LiBH4 under a hydrogen atmosphere, while MgH2 dehydrogenate. A characteristic solid-liquid reaction is realized under a hydrogen atmosphere for proceeding of the MgB2 producing reaction in this system.

元の言語English
ページ(範囲)306-309
ページ数4
ジャーナルJournal of Alloys and Compounds
446-447
DOI
出版物ステータスPublished - 2007 10 31
外部発表Yes

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Noble Gases
Thermoanalysis
Hydrogen
Inert gases
Molten materials
Liquids
Dehydrogenation
Temperature
Flow of gases
Desorption
Melting
Gases
Decomposition
titanium trichloride

ASJC Scopus subject areas

  • Metals and Alloys

これを引用

Thermal analysis on the Li-Mg-B-H systems. / Nakagawa, Tessui; Ichikawa, Takayuki; Hanada, Nobuko; Kojima, Yoshitsugu; Fujii, Hironobu.

:: Journal of Alloys and Compounds, 巻 446-447, 31.10.2007, p. 306-309.

研究成果: Article

Nakagawa, T, Ichikawa, T, Hanada, N, Kojima, Y & Fujii, H 2007, 'Thermal analysis on the Li-Mg-B-H systems', Journal of Alloys and Compounds, 巻. 446-447, pp. 306-309. https://doi.org/10.1016/j.jallcom.2007.02.097
Nakagawa, Tessui ; Ichikawa, Takayuki ; Hanada, Nobuko ; Kojima, Yoshitsugu ; Fujii, Hironobu. / Thermal analysis on the Li-Mg-B-H systems. :: Journal of Alloys and Compounds. 2007 ; 巻 446-447. pp. 306-309.
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AU - Fujii, Hironobu

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AB - Thermal analyses of the mixture of MgH2 and LiBH4 doped with TiCl3, and each element MgH2 or LiBH4 doped with TiCl3 were performed under an inert gas flow and 0.5 MPa H2-gas conditions. It was indicated that the hydrogen desorption reaction of MgH2 + 2LiBH4 to MgB2 + 2LiH + 4H2 phases proceeded at temperature above 400 °C under 0.5 MPa hydrogen, whereas, under an inert gas atmosphere, the reaction of the same mixture was transformed into Mg + 2B + 2LiH + 4H2 phases in a temperature range from 350 to 430 °C. Before these reactions, the dehydrogenation of MgH2 and the melting of LiBH4 took place under both hydrogen and the inert gas atmospheres with increasing temperature. In addition, the molten LiBH4 did not decompose into LiH, B and H2 below 450 °C under 1 MPa H2, while the LiBH4 decomposed even below 450 °C under an inert gas atmosphere. From these results, it is deduced that the reaction producing MgB2 is a solid-liquid reaction between solid Mg and liquid LiBH4 above 400 °C without decomposition of molten LiBH4 under a hydrogen atmosphere, while MgH2 dehydrogenate. A characteristic solid-liquid reaction is realized under a hydrogen atmosphere for proceeding of the MgB2 producing reaction in this system.

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KW - X-ray diffraction

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