| The investigation of the electronic spectra of transition metal ions in solution, melts, and single crystals has become an intense area of research. Likewise, measurements of the magnetic properties of transition metal ions have been extensively carried out. The electronic and magnetic properties of glasses containing transition metal ions, however, have not been as extensively investigated.;In this study, the electronic and magnetic properties of Cr, Mn, Fe, Co, Ni, and Cu in Li3PO4 glass have been studied. Unlike the study of Cr and Mn in single crystals of Li3PO4 and Ca2(PO4)Cl in which the metal ions replace a phosphorus atom and thus have a "pentavalent" oxidation state in the Li3PO 4 glass the various metal ions become coordinated by oxygen from two or three phosphate groups and possess normal oxidation states.;The electronic spectra of the various doped glasses indicate that the Cr, Mn, Fe, Ni and Cu ions are octahedrally coordinate and possess the following oxidation states, Cr3+, Mn3+, Fe2+ and 3+, Ni2+ and Cu2+. The Li 3PO4 glass containing cobalt gives rise the a spectrum that is characteristic of tetrahedrally coordinated Co2+ species.;The magnetic data for the Li3PO4 glass containing Cr, Mn, Fe, Ni and Cu give magnetic moments that are lower than the calculated values for the spin-only moments. This indicated that the species present in the glass undergo antiferromagnetic coupling at room temperature. The cobalt containing glass gives a magnetic moment that is higher than the calculated value for the spin-only moment, thus indicating that the glass is showing normal paramagnetism at room temperature. |
