Torres pardo

• Na-Nb-O-Sr
• Mn-O-Sr
• Na-Nb-O-Ta
• Ca-Mn-O
• O-Pb-Ti-Zr
• structural properties
• electronic and electrical properties
• permittivity (dielectric constant)
• structural transitions
• ferroelectric transitions
• chalcogen
• transitional
• alkaline
• quaternary
• alkali
• orthorhombic
• tetragonal
• cubic
• hexagonal