A band at 1080 cm -1 is assigned to BaCO3 impurity. The position of the Raman bands in the work by Sherlin Vinita and coworkers "is different when compared to previous reports due to the synthesis method" (see references in Sherlin Vinita et al.). In previous literature Raman bands have been observed at 250, 307, 520 and 720 cm -1 for material prepare by solvothermal method Sherlin Vinita and coworkers note a red shift in Raman bands they observed as due ""to the localized tensile strain in the material".