X-ray diffraction studies of the structure of LaA1Ga metallic glasses

Abstract

The LaLa and LaA1 partial atomic distribution functions have been determined for glassy La 1− x A1 x from X-ray diffraction studies of isomorphous alloys of La 1− x A1 x , La 1− x (A1Ga), and La 1 − x Ga x for x = 0.20, 0.24 and 0.28. The atomic short range order of these La based metallic glasses is quite different from that of typical amorphous transition metal-metalloid alloys and from dense random packing models. A relatively short and well defined LaA1 nearest neighbor distance suggests some covalency in the bonds between unlike atoms and possible chemical ordering in the alloys.