P4mm, Structural transitions

• Ba-O-Ti
• Mg-Nb-O-Pb-Ti
• O-Pb-Ti
• Ba-Ca-O-Ti-Zr
• K-Na-Nb-O
• temperature for structural transition
• pressure for structural transition
• pressure derivative of transition temperature
• chalcogen
• transitional
• ferroelectric
• disordered
• oxide
• tetragonal
• cubic
• monoclinic
• orthorhombic