HGd[P2O7][H2O]3 aP28 2

• H-Ho-O-P
• Er-H-O-P
• Eu-H-O-P
• H-O-P-Tb
• H-O-P-Y
• optical properties
• structural properties
• phonons
• vibrational spectra
• wavenumber of optical phonon
• rare earth
• diphosphate
• chalcogen
• quaternary
• pnictogen
• triclinic