No.2（2007）15.Crystal growth of Boron-rich compounds in the Al-Mg-B system

Minoru Tanaka, Iwami Higashi

The crystal growth of boron-rich compounds of the Al-Mg-B system from high temperature Al solutions was studied. The purities of starting materials were as follows: Al, 4N; Mg, 4N; B, 99.5 %. Each of the mixtures with an excess quantity of Al was placed in an alumina crucible, and heated by an electric furnace in an argon atmosphere. The crystals were grown by cooling high temperature aluminum melts, which had been soaked for 2 or 3 h at 1500 ℃. The grown crystals were separated by dissolving an excess of aluminum metal with hydrochloric acid. The boron-rich crystals thus obtained were examined by Video microscope, SEM, EDX, XRD and chemical analysis, etc. The crystals were AlMgB₁₄, Al-_1.4Mg-_0.4B₂₂ (γ-AlB₁₂ type) and α-AlB₁₂.

Keywords

Boron-rich compounds, Aluminum-Magnesium-Boron

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