Density functional theory study on the structural, electronic, optical and photocatalytic properties of BaTa₂O₆, Ba₂Ta₁₅O₃₂, Ba₃Ta₅O₁₅ and Ba₅Ta₄O₁₅

Yi Hua Du, Wei Zeng, Bin Tang, Fu Sheng Liu, Qi Jun Liu, Xing Han Li, Mi Zhong