We wish to investigate the effect of glass composition on the environment of rare earth ions doped into chalcogenide glasses. To achieve this the series of glasses, yNd2S3 ¿ (1-y)[xGa2S3 (1-x)GeS2], will be studied using two tie lines in this ternary system, yNd2S3 (1-y)[0.3Ga2S3 0.7GeS2] where y = 0, 0.03, 0.06 and 0.09, and 0.06Nd2S3 0.94[xGa2S3 (1-x)GeS2] where x=0.2, 0.25, 0.35 and 0.4. The results, used in conjunction with Raman, X-ray diffraction data (ISIS Ag-tube diffractometer), and a future magnetic difference neutron diffraction study, will be used to gain an insight into the relationship between the Nd environment and composition.