Alkali, Chalcogen, Imaginary part of permittivity

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