Rapidly quenched Co-Fe based ferromagnetic amorphous ribbons and pseudobulk metallic glasses are attractive group of materials for structural and functional use. In the present contribution, structure of as-cast and annealed Co-Fe-B-Si-Nb pseudobulk metallic glasses with increased thickness was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). In addition, influence of a small addition of gallium (2 at.%) into base composition on structure of the ribbon was investigated. (C) 2012 Elsevier B. V. All rights reserved.