Synthesis & Properties of Nd-doped Glass-ceramics in the SiO2-CaO-MgO System from Sol-gel Method Used as Solid Lasers<br/>

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Synthesis & Properties of Nd-doped Glass-ceramics in the SiO2-CaO-MgO System from Sol-gel Method Used as Solid Lasers

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42746 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Hamnabard, Zohreh; Nemati, Ali
Abstract:
In this study, SiO2-CaO-MgO galsses and glass-ceramic powder doped with Nd3+ were synthesized with sol-gel method. Tetraethylorthosilicate (TEOS), Ca(NO3)2.4H2O, Mg(NO3)2.6H2O, Nd(NO3)3.6H2O, ethanol, distilled water, and HNO3 were used as starting materials. The synthesized powder’s properties were examined with STA, XRD, DRS, PL, FTIR and SEM analysis. From XRD patterns of glass samples, the role of dopant was introduced as intermediate oxide in glass matrix. The XRD patterns of glass-ceramic samples indicated that the bredigite and akermanite crystals were formed in glass matrix. The band gap energy of samples were calculated from DRS analysis and were seen with increasing the dopant concentration, the band gap energy of glasses decreased and after 5%wt of dopant, the band gap energy increased again. Also with increament of heat treatment’s temperature, the band gap energy of samples decreased. Luminescence measurements showed that much stronger emission in the glass ceramics than that in the corresponding glass.The back scattered electron (BSE) image illustarates uniform and homogeneous distribution of applied oxides in glass and glass-ceramic composition
Keywords:
Glass ; Sol-Gel Method ; Glass-Ceramic Laser ; Solid State Lasers

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