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

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