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Pd$_{81}$Ge$_{19}$ metallic glass was investigated by neutron diffraction,X-ray diffraction and extended X-ray absorption fine structure spectroscopy(EXAFS) at the Ge K-edge. Large scale structural models were obtained byfitting the three measurements simultaneously in the framework of the reverseMonte Carlo simulation technique. It was found that the experimental data setscan be adequately fitted without Ge-Ge nearest neighbours. Mean Pd-Pd and Pd-Gedistances are 2.80$\pm$0.02 {\AA} and 2.50$\pm$0.02 {\AA}, respectively. Thetotal average coordination number of Pd is 12.1$\pm$0.5 while Ge is surroundedby 10.6$\pm$1.1 Pd atoms. The coordination numbers calculated from partial paircorrelation functions were compared to those obtained by Voronoi tessellationmethod. It was found that the latter technique overestimates the number ofnearest neighbours by about 20% due to the significant contribution of distantpairs.

Chemical ordering in Pd$_{81}$Ge$_{19}$ metallic glass studied by reverse Monte-Carlo modelling of XRD, ND and EXAFS experimental data