Transactions of the INDIAN CERAMIC SOCIETY Vol. 25 1966
Absorption Spectra of Mn2+ Ion in Glasses
s. KUMAR AND P. NATH
Pages : 12-19
DOI : 10.1080/0371750X.1966.10855548
Abstract
Absorption spectra of Mn2+ ion in alumino-boro-phosphate, magnesium-aluminoborate
and soda-lime-silica glasses were studied within the range, 16000 cm-1
30000 cm-1• Five absorption bands were observed at or around 19200 cm-1
[
4TlG)], 23300 cm-1 [4r 5(G)], 24000 cm-1 [ 4r 3, 4r 1 (G)], 28100 cm-1 [ 4r 5 (D)]
and 29300 cm-1 [4r 3 (D)]. Good agreement was noticed between the observed
band positions and the values calculated from ligand field considerations. The
molar extinction co-efficient varied with glass composition. It is about ten times
higher than that in aqueous solution and is nearly one hundredth of the corresponding
value due to Mn3+ ion in the same base glass. The spectrophotometric
and fluorescence studies reveal that Mn2+ ion is present mostly in octahedral
coordination in alumino-boro-phosphate glass. In the silicate glasses probably
the tetrahedral co-ordination is more predominant.
