Lattice constants, sizes of graphite crystallite, and degree of crystallite orientation of many commercial graphite electrodes were measured by the X-ray diffraction method. The distribution of inorganic impurities in these electrodes, which was investigated by means of radiography, had been dealt with in our previous papers (Tanso (Carbon), No.30, 26 (1961) and No.31, 9 (1962)).
Using extra pure silicon powder as an inner standard, the lattice constants-
c0 (002),
c0 (004) ,
a0 (110) ,
d (112) -and the sizes of graphite crystalite-
Lc (002) ,
Lc (004) ,
La (110) ,
L (112) -were obtained from (002), (004), (110) (112) diffractions, respectively. The values of
c0 of all the electrodes except one were 9.720-6.728Å and any remarkable differences were not found among them. The values of
a0 (110),
c (112),
Lc, and
La (110) of all the electrodes were 2.460Å, 1.156Å, ca. 500Å, and ca. 1000 Å, respectively. The value of
L (112) of Acheson 18″ electrode was larger than those of the other electrodes.
The orientation ratio was calculated, which had been proposed as a measure of crystallite orientation in our previous paper (Kogyo Kagaku Zasshi, 62, 1300 (1959)). The orientation ratios of all the elecrodes were 1.1-1.2.
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