Exploring structural, vibrational, optical and photoluminescence characteristic of tetragonal-tungsten bronze Ba4Bi2Fe2Nb8O30 compound. - Dubey, Shubha; Dubey, Kumud; Sahu, Vineet; Modi, Anchit; Pagare, Gitanjali; Haque, Fozia Z.; Gaur, N. K. (Journal of Materials Science: Materials in Electronics, 2023)