二ほう化マグネシウム

危険有害性情報のコード(GHS)

• 絵表示(GHS)

  

• 注意喚起語

  Warning

• 危険有害性情報

  H302：飲み込むと有害

• 注意書き

  P264：取扱い後は皮膚をよく洗うこと。

  P264：取扱い後は手や顔をよく洗うこと。

  P270：この製品を使用する時に、飲食または喫煙をしないこ と。

  P330：口をすすぐこと。

二ほう化マグネシウム 価格

二ほう化マグネシウム 化学特性,用途語,生産方法

• 解説

  二ホウ化マグネシウム:MgB2(45.93)．六方晶系で，Bは平面グラファイト型につながり，Mgは層間に入る．低温超伝導物質としては異常に高い－234 ℃ で超伝導を示す．

• 特徴

  XDS. 超伝導体. Tc 39 K. 単位格子の頂点にMg, (1/3, 2/3, 1/2), (2/3, 1/3, 1/2)にB原子があり, MgとB原子が各層を形成する. 空間群P6/mmm, a 3.0851(5), c 352.01(5) pm, B−B 178 pm, Mg−B 250 pm.

  

• 説明

  Magnesium diboride (MgB₂) is a simple ionic binary compound that has proven to be an inexpensive and useful superconducting material.

• 化学的特性

  Magnesium Boride is brown solid, by reaction of boron oxide and magnesium powder ignited.

• 物理的性質

  Its molecular weight is 45.9325 g/mol. Magnesium Boride melts at 830°C and is hexagonal with space group P6/mmm and lattice constants of a=3.0864? , c=3.5215 ?. The density is 2.625 g/cm³ and the hardness is 1260 kg/mm².

• 使用

  Magnesium Boride exhibits super conducting properties and utilized in MRI superconducting magnet, which is a closed-loop cryocooler. It is used as propellants, pyrotechnics and explosives. It can be used as high temperature boron-based thermoelectric materials. It is also used in superconducting transformers, rotors, transmission cables, superconducting radio frequency cavities to minimize energy loss.

• 製造方法

  Magnesium boride can be formed directly from the elements. Mg melts at 650 °C and boron melts at 2076 °C. Therefore, if a vapor of Mg metal at >750°C (red-heat) is passed over crystals of boron, reaction forms the desired boride. However, to obtain a stoichiometric compositions, it is better to heat the well-mixed powders of Mg and B to obtain specific compounds:
  Mg + 2B→MgB₂

• 一般的な説明

  Magnesium boride (MgB₂) powder is a superconductive material which has a critical temperature (Tc) = 39K. It can be used for a variety of applications such as hydrogen storage, high energy fuel and high field superconductors.

• 参考文献

  S. Lee, et al., J. Phys. Soc. Jpn., 70, 2225 (2001).

二ほう化マグネシウム 生産企業

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