K2BeF4 oP28 33

• Be-F-K
• Cl-Co-Rb
• H-K-N-O-S
• H-N-O-Rb-S
• H-N-O-S-Se-Tl
• thermal and thermodynamic properties
• phase transitions
• structural transitions
• electronic and electrical properties
• temperature for structural transition
• alkali
• ferroelectric
• pnictogen
• chalcogen
• halogen
• orthorhombic