Crystallization behavior of MgB2 films fabricated on copper cathodes via electrochemical technique

► A modified electrolysis cell was devised to prepare MgB2 films on copper cathode. ► Crystallization behavior of MgB2 phase of films was investigated. ► Phase transformation of Mg-B and Mg-Cu compound was discussed. ► Mechanism for the dendritic growth of MgB2 phase was proposed.