2015 Fiscal Year Final Research Report
Research for preparation and high hardness material of aluminium higher boride MgAlB22
Project/Area Number |
25420716
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Inorganic materials/Physical properties
|
Research Institution | Kokushikan University |
Principal Investigator |
Okada Shigeru 国士舘大学, 理工学部, 教授 (40191952)
|
Project Period (FY) |
2013-04-01 – 2016-03-31
|
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 |
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.
|
Free Research Field |
工学
|