Effect of MnO addition on chemical durability, glass-crystal transition, thermal, structural, optical, EPR, and color properties of Na2O-CaO-P2O5 ternary glass system

Physical, Thermal, and Optical Properties of Mn2+ and Nd3+ Containing Barium Phosphate Glasses

“…The lower inset of Figure is an enlargement for the 2Mn and 05-2NdMn glasses in the 375–450 nm range for better appreciation of the 410 nm absorption assigned to 6 A 1 (S) → 4 E(G), 4 A 1 (G) transitions in Mn 2+ (d 5 ) ions in octahedral coordination. ,,, The visible absorption of the 2Mn glass was otherwise resembling that of the undoped BP glass showing merely baseline absorption. This is consistent with the colorless appearance of the 2Mn glass and the lack of significant oxidation, which would otherwise produce a purple hue due to the absorption around 500 nm stemming from 5 E g → 5 T 2g transition in Mn 3+ (d 4 ) ions in octahedral coordination. ,− In addition, the 05-2NdMn glasses exhibit increasing intensities for the different Nd 3+ transitions, ,, spanning from the visible to the NIR. Further, the spectrum of the 2NdMn glass shows comparable intensity to the 2Nd reference concurring with a lack of interference from Mn 3+ .…”

“…Regarding the effect of manganese(II), Franco et al studied Mn 2+ -doped zinc phosphate glasses of the P 2 O 5 –Na 2 O–ZnO type and reported a slight tendency for the T g to increase with MnO content added up to 1 mol %. Recently, Akhrouf et al also reported increasing T g values for the entire range studied in 25Na 2 O–(30 – x )CaO– x MnO–45P 2 O 5 (0 ≤ x ≤ 30 mol %) glasses. On the other hand, Pascuta et al studied glasses in the x MnO–40P 2 O 5 –(60 – x )ZnO system with x up to 20 mol % and reported a lower T g for 5 mol % MnO relative to the undoped glass.…”