Almeida paz

• Fe-H-K-O-P-V
• Er-H-Na-O-Si-Y
• Eu-Gd-Na-O-Si
• O-Si
• Eu-Ge-H-Na-O-Si-Y
• structural properties
• magnetic properties
• Curie-Weiss paramagnetism
• optical properties
• values of Moessbauer spectra
• chalcogen
• multinary
• transitional
• alkali
• monoclinic
• tetragonal
• orthorhombic
• triclinic