Preparation of Ultrafine Particles of Refractory Oxides by Gas-Evaporation Method

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概要

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• Ultrafine particles of refractory oxides, SiO_2, MgO, Al_2O_3, Fe_3O_4, Mg_2SiO_4, CaTiO_3 and MgAl_2O_4, were prepared by the gas-evaporation method. Oxide materials were heated by a CO_2 laser beam of output 100 W and their vapors were condensed in the gas environment of He, Ar or Xe of 3.5〜670 Torr. Fractional vaporization did not occur except for MgAl_2O_4. Most of the particles were spherical with the diameter of about 100 Å for both of the amorphous and crystalline oxides. They usually stuck to one another and looked like a tangled chain of spheres. The maximum yield of the ultrafine particles was about 10 mg per min. Some applications of the refractory ultrafine particles were discussed especially in connection with earth science.

• 社団法人応用物理学会の論文
• 1976-05-05

著者

• Kato Manabu

  Department Of Earth Sciences Faculty Of Science Nagoya University

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