Original scientific paper

On the Existence of the FCC Uranium

M. Tudja ; Institute »Ruder Boskovic«, 41000 Zagreb, Croatia, Yugoslavia
Z. Ban ; Institute »Ruder Boskovic«, 41000 Zagreb, Croatia, Yugoslavia

Abstract

Diffusion studies in the system U - S, employing the couples
U - US, U - US2 and U -- U3S5 revealed the existence of new FCC
phase with the composition ranging from approx. U20S to U8S. The
lattice parameter of the phase as obta ~ned in the diffusion couple
is 4.95 ± 0.01 A. The same phase can be also obtained by the arc
melting of the mixtures of U and US or U and S in the appropriate
proportions, if followed by the heat treatment at 1900 °c during at
least four hours. It is believed that this is a crystal structure modification of uranium stabilized by the addition of a small quantity of
nonmetal atoms, where S and N play a mayor role. The same phase
has been obtained through the addition of approximately 9 a/o of Se,
Te, P, As, Sb, Bi, C and Si. Although the effect of the stabilization
is not yet completely understood all samples contain a FCC phase
and posess virtually the same lattice parameter as the phase containing
sulphur. The experimental density amounts 14.21 g cm·:i. The
calculated density is 13.21 g cm-3•

Keywords

Hrčak ID:

197033

URI

https://hrcak.srce.hr/197033

Publication date:

30.6.1973.

Visits: 738 *