As-Ba-Fe-K, As-x polyhedra, Phase transitions, Transitional

• As-Ba-Co-Fe-K
• As-Ba-Fe-K-Sn
• structural transitions
• temperature for structural transition
• temperature for congruent melting
• fusion
• metalloid
• alkali
• alkaline
• disordered
• pnictogen
• tetragonal
• orthorhombic