Elastic stiffness coefficient, P-x polyhedra, Transitional

• Cu-La-O
• K-O-P-Ti
• O-P-Rb-Ti
• O-P-Ti-Tl
• Fe-O-P
• transitional
• non-disordered
• chalcogen
• disordered
• pnictogen
• orthorhombic
• cubic
• trigonal
• hexagonal