As-x polyhedra, Metalloid, Pnictogen, Phase transitions

• As-Ba-Fe
• As-Fe-Sr
• As-Ba-Fe-K
• As-Fe-La-O
• As-Ba-Co-Fe
• fusion
• temperature for congruent melting
• structural transitions
• temperature for structural transition
• pressure for structural transition
• metalloid
• pnictogen
• transitional
• non-disordered
• tetragonal
• orthorhombic
• monoclinic
• cubic
• hexagonal