Keester

• Na-O-S
• Na-Ni-O-S
• Ni-O-S
• Na-O-S-Y
• O-Pb-Sr
• structural properties
• phase transitions
• temperature for structural transition
• structural transitions
• peritectic formation
• chalcogen
• alkali
• non-disordered
• sulfate
• quaternary
• monoclinic
• hexagonal
• orthorhombic
• cubic
• tetragonal