Structure of Very Thin Evaporated Films of Cobalt

Radial distribution functions for very fine multiply-winned particles are calculated and compared with Morimoto and Sakata's experimental data obtained from intensities of electron diffraction patterns of very thin cobalt films evaporated at 20°C on amorphous substrates. It is concluded from the result of the present calculations that aggregate of multiply-twinned icosahedron particles and their derivatives, having the sizes of about 5 Å to 15 Å, can explain fairly well the unusual peaks shown in the radial distribution functions obtained from cobalt films. This conclusion seems more natural than the explanation of Morimoto and Sakata that the thin cobalt films contain both h.c.p. and diamond-type crystallites having anomalously large amplitude of thermal vibration.