Alkali, Chalcogen, Ferroelectric, Imaginary part of permittivity

• As-H-K-O
• As-H-K-N-O
• K-Nb-O-Ta
• Bi-Na-O-Ti-W
• As-H-N-O-Rb
• ferroelectric
• alkali
• chalcogen
• nonmetal
• oxide
• tetragonal
• orthorhombic
• cubic
• trigonal
• monoclinic