Alkali, Nonmetal, Orthorhombic, Real part of permittivity

• As-H-N-O-Rb
• Bi-Na-Nb-O-Sr
• H-Li-N-O-S
• Ba-F-K-O-Ti
• H-Li-O-P
• alkali
• nonmetal
• chalcogen
• ferroelectric
• transitional