Alkali, Chalcogen, Nonmetal, Imaginary part of permittivity

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