Chalcogen, Delafossite, Ferroelectric, Transitional, Cu-Fe-O

• Al-Cu-Fe-O
• Cu-Fe-Ni-O
• Cu-Fe-Gd-O
• Cu-Fe-Ho-O
• magnetic properties
• magnetic transitions
• electronic and electrical properties
• phase transitions
• structural transitions
• ferroelectric
• delafossite
• chalcogen
• antiferromagnetic
• multiferroic
• trigonal
• monoclinic