Density, chemical, structural and vibrational studies of Sb<sub>65</sub>Se<sub>35-x</sub>Ge<sub>x</sub> system with 0 ≤ x ≤ 20 produce by melt-quench technique were carried out using Archimedes method, Energy Dispersive Spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopy. All specimens are polycrystalline in nature as confirmed by XRD pattern. The compositional dependence of the XRD and Raman spectra suggests the presence of two basic structural units, SbSe<sub>3</sub> pyramids with three-fold coordinated Sb atom at the apex and GeSe4 tetrahedrons. The compositional dependence of these physic Chemical properties of the investigated samples are investigated and discussed in light of many models. PACS: 68.55. Ln; 61.50. Ks; 68.55.Jk
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