Study of Metallic Carbides by Electron Diffraction : Part IV. Cobalt Carbides
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Thin cobalt films formed by evaporation were carburized in town gas at temperatures below 550℃ for several hours. Electron diffraction studies of these films confirmed the existence of two kinds of carbide, CO_2C and Co_3C. Co_2C is. an orthorhombic crystal with lattice constants a = 2.910, b = 4.469 and c = -4.426Å, and has a distorted c.p.h. structure. The lattice relation between CO_2C and Co is (001)_<Co_2C>//(00.l)_<a-Co>//(1l1)_<β-Co> and [l00] _<Co_2C>//[10.0] _<a-Co>//[101^^-]_<β-Co>. CO_2C is formed at temperatures in a range 450〜500℃, and decomposes gradually to a-Co containing stacking faults and graphitic carbon at temperatures in a range 450°-470℃. Co_gC is an orthorhombic crystal with lattice constants a = 4.483, b = 5.033 and c = 6.731 Å and is isomorphous with cementite (Fe_3C). The lattice relation is (121)_<Co_3C>//(10.1)_<a-Co>//(100) _<β-Co>, and [111] _<Co_3C>//[01^^-.0]_<a-Co>// [001] _<β-Co>. Co_3C is formed at temperatures in a range 450°-500℃ and decomposes gradually to a-Co containing stacking faults and to graphitic carbon at temperatures in a range 480°-490℃. The mechanisms of CO_2C and Co_3C formation and decomposition are discussed.
- 社団法人日本物理学会の論文
- 1961-06-05
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関連論文
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- Study of Metallic Carbides by Electron Diffraction : Part IV. Cobalt Carbides