Structural and Magnetic Рroperties of Copper Substituted Mg-Ferrites Tatiana Kiseleva, Vladislav Kabanov, Alexander Ilyushin, Gennadiy Markov, Deleg Sanga and H. Hirazawa EPJ Web Conf., 185 (2018) 04010 Published online: 04 July 2018 DOI: 10.1051/epjconf/201818504010