Anomalous X-ray scattering experiments for glassy room-temperature superionic conductors (As2Se3)(0.4) (AgI)(0.6) and (As2Se3)(0.4)(AgBr)(0.6) were performed close to the As, Se, Ag, and Br K edges using a third-generation synchrotron radiation facility, ESRF. The differential structure factors, Delta S-i(Q), were obtained from detailed analyses, indicating that Delta S-As(Q) and Delta S-Se(Q) of both the glassy superionic semiconductors are similar to those of glassy As2Se3 except the prepeak in Delta S-Se(Q). The Delta S-Ag(Q) spectrum of (As2Se3)(0.4) (AgI)(0.6) looks molten salt-like. However, the Delta S-Ag(Q) of (As2Se3)(0.4)(AgBr)(0.6) glass have quite different features from that of (As2Se3)(0.4) (AgI)(0.6) glass in the low Q range, and the Delta S-Br(Q) has even a pre-shoulder around 13 nm(-1) unlike molten salts. In the differential pair distribution functions Delta(i)g(r) obtained from the Fourier transforms of Delta S-i(Q), the first peaks of Delta(As)g(r) and Delta(Se)g(r) show no correlation with those of Delta(Ag)g(r) and Delta(Br)g(r), and vice versa. From these results, it can be concluded that a pseudo-binary mixture of the As2Se3 network matrix and AgX-related ionic conduction pathways is a good structural model for these superionic glasses. Differences between the AgBr- and AgI mixtures were found in the second-neighbor structures around the Ag atoms, which may reflect those in the crystal structures of the AgX salts. (C) 2008 Elsevier B.V. All rights reserved.