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FTIR and Optical Absorption Studies of [B2O3]- [Na2O]-[Li2O]-[CuO] Doped with [MgF2] Nanoparticle |
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PP: 45-51 |
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Author(s) |
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Khadijah M. AL-Mokhtar,
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Abstract |
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| The glass system of composition [65B2O3]-[15Na2O]-[(18-X)Li2O]-[2CuO]-[xMgF2] Where x=0,3,6,9,12,and 15 mol%, has been prepared by conventional melt quenching technique. The density and molar volume (VM) were obtained. The density (ƿ) show almost monotonic increase by increasing MgF2 content the molar volume has opposite trend. Fourier
transforms infrared (FTIR) Spectroscopic studies revealed the presence Bo3 triganal and Bo2 tetrahedral structural unit these glass. Show that the ratio the ( Bo4/Bo3 + Bo4 )follows opposite trend to that of density , recalling that the numbers of Bo4 group ,decrease due to Bo4→Bo3 back diversion and content of (Bos) . The above arguments allow to conclude that the addition MgF2 enhance the format of non-bridging oxygen, this increase the degree of disorder system. Optical transmittance spectra the samples in the range (190-2500) nm was measured and show two important feature .the first is transmission band located at short wave length side which centered at about 500 nm is most likely produced to an octahedral coordination of Cu++in the glass with strong tetragonal distortion. All samples exhibit bond pass filter behavior .the second feature is the absorption edge at the long wave length side . The Urbach energy ∆E increase with increasing MgF2 Content indicate the increases the disorder of glass system. The opposite trend was observed in the value of ∆E is associated with structural disorder in many amorphous solid. |
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