New Sb2O3-based multicomponent heavy metal oxide glasses in the Sb2O3-Na2O-WO3-PbO system were prepared using a conventional melt-quenching technique. Glass formation behavior of these glasses and their thermal, physical and structural properties were investigated using X-ray diffraction (XRD), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM/EDS), differential scanning calorimetry (DSC), UV-Vis-NIR spectroscopy and Fourier transform infrared (FTIR) spectroscopy analyses according to the increasing PbO concentration by keeping the Sb2O3/WO3 ratio constant. Thermal analysis of the glasses were realized in terms of glass transition temperature (T-g), crystallization temperature (T-c/T-p), glass stability against crystallization (Delta T), activation energy of the glass transition reaction (E-g) and fragility parameter (m). Density (rho), molar volume (V-M), oxygen molar volume (V-O), oxygen packing density (OPD), refractive index, band gap energy (E-g), average cross-link density ((n(c)) over bar), number of bonds per unit volume (n(b)) and Poisson's ratio (mu(cal)) values were calculated for the interpretation of physical and structural properties of the glasses. FTIR spectra of the glasses were evaluated in terms of structural transformations on the glass network. (C) 2014 Elsevier B.V. All rights reserved.