タングステン粉末の気体酸素による酸化速度とX線回折線の拡がりについて

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  • On the Oxidation Rate in O<SUB>2</SUB> Gas and the X-ray Line Broadening of Tungsten Powder. (Study of the Surface States of Tungsten Powder (4))
  • タングステン フンマツ ノ キタイ サンソ ニ ヨル サンカ ソクド ト Xセン カイセツセン ノ ヒロガリ ニ ツイテ

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The X-ray line broadening from tungsten powder has been studied in relation to its oxidation rate. If βcosθ is plotted against sinθ, β being the line breadth at half maximum at Bragg angle θ, a crooked line is obtained that is inclined to the sinθ axis on an average. The results show that the oxidation rate is closely related to the average inclination of the crooked line and the level height of βcosθ corresponding to (200), as measured from that corresponding to (110). A change of such a relative level height and of the inclination on heating or pressing the powder is accompanied by decrease or increase of the oxidation rate. The shape of the crooked line and oxidation rate of tungsten powder are independent of the particle size and the quantity that has been dissolved. This indicates that the crystal structure is homogeneous throughout the whole part in any particle. It is believed that the phenomenon of such line broadening is dependent on the crystallite size, lattice distortion and irregularities which greatly affect the chemical reactivity.

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