Study on F-F Transitions of Powdered Neodymium Compounds by Photoacoustic Spectroscopy

Photoacoustic (PA) spectra of powdered neodymium oxide ( Nd2O3 (A type)), neodymium hydrated chloride (NdC13·6H2O) and neodymium fluoride (NdF3) were reported. PA band shifts as compared to their positions in aqueous Nd3+ are used to calculate the nephelauxetic parameters of the compounds. The variation of these parameters and correlation with the nature of metal-ligand bonding were discussed. A novel method is introduced to determine the relative values of oscillator strengths and Judd-Ofeh parameters of powdered samples using PA spectroscopy. It is found that a linear correlation exists between relative values of r2 and oscillator strengths of hypersensitive transitions of the title compounds. It is hopetul that the new method of PA technique may serve for the JuddOfelt quantitative analysis of powdered rare earth compounds.