Crystal-field spectra of MnII and FeIII in sodium phosphate glasses

Local structure and medium range ordering of tetrahedrally coordinated Fe3+ ions in alkali–alkaline earth–silica glasses

“…It is therefore not surprising that C > 4B for our glasses. Literature on various glasses [14,16,17,29,30,32,33,36,38,55,57] indicates that the following ranges of values should be expected for tetrahedral Fe 3+ ions in silicate glasses:…”

“…12 demon- strates that linewidths generally fall in the range 1500-3000 cm À1 ; values similar to those obtained by Kinawi for the 6 A 1 (S) ! 4 T 1 (G) transition for Fe 3+ ions in sodium phosphate glasses [55]. The absence of any clear relationship linking composition with linewidths may be explained by the linear decrease in the 4 T 1 (G) energy level which occurs with increasing 10Dq for high-spin Fe 3+ [9,[11][12][13][14].…”