抄録
Optical absorption spectra of Ni2+ and Cr3+ have been determined over the range 350∼2500nm in binary silicate, borate, phosphate and germanate glasses.
The values of the crystal field strength Dq and the Racah parameters B and C for the glasses were calculated from the observed band positions. The assignments for the bands ν1∼ν5 and νT1 of Ni2+ and Cr3+ in these glasses were made and the calculated band positions of ν1∼ν5 were determined as shown in Table I. The increase of Dq in the composition range of approximately 25∼45mol. per cent PbO for the lead-borate glass is interpreted based on the evidences that the four-co-ordinated borons are present and the type of lead-oxygen association becomes more covalent bonding.
