Sol-gel auto-combustion method for the synthesis and investigation of Zr4+/Cu2+ doped barium calcium M-type hexaferrites. - Godara, Sachin Kumar; Bhadan, Mandeep; Badal, Arun; Singh, Baljinder; Sood, Ashwani Kumar; Alshehri, Saad M.; Kandwal, Abhishek; Anju; Singh, Gurpreet; Singh, Mandeep (Journal of Sol-Gel Science & Technology, 2025)