| Project/Area Number |
25420716
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Kokushikan University |
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Principal Investigator |
Okada Shigeru 国士舘大学, 理工学部, 教授 (40191952)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2015: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2014: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2013: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
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| Keywords | アルミニウムマグネシウム高ホウ化物 / アルミニウム自己フラックス法 / ビッカース微小硬さ / 低温磁化率 / アルミニウムマグネシウム22ホウ化物 / 金属マグネシウム / 結晶性ホウ素 / アルミニウムマグネシウム１４ホウ化物 / エネルギー分散型Ｘ線分析計 / 格子定数 / 硬さ / アルミニウム自己フラックス / フッ化マグネシウム / 磁化率 / MgAlB22 / フラックス法 / 斜方晶系 |
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| Outline of Final Research Achievements |
MgAlB22 crystals were grown from Al-self flux in an Ar atmosphere. The raw materials used Mg metal, Mg salts, B and Al. The conditions for growing MgAlB22 were established using the starting mixtures of atomic ratio B/Mg = 2.0. The temperature of the furnace was raised to 1400℃, kept for 5 h and then cooled at a rate of 50℃/h. The crystals were selected under a microscope for the measurements of micro-hardness and magnetic susceptibility. Magnetic susceptibility of MgAlB22 was measured by using a SQUID magnetometer. The MgAlB22 crystals obtained from Mg or MgF2 and boron powders as starting materials of atomic ratio B/Mg = 2.0. The MgAlB22 crystals have well-developed {100} faces and the maximum dimensions of about 6.5 mm. The reagents used to prepare the solid solution (Mg1-xLEx)AlB22(LE = Li, Na, K) crystals were Mg metal, LE2B4O7, B and Al. The (Mg1-xLEx)AlB22 crystal was not obtained at the experiment. The value of microhardness of crystal was in the range of 25.4(0.6) GPa.
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