Fabrication And Properties Of Silica Glass Containing Neodymium Via SPS

Silica glass has good chemical stability, low coefficient of thermal expansion, strong resistance against thermal shock, low optical loss and high mechanical strength, and thus is suitable as the host material for the rare earth ion. Neodymium doped silica glass as a kind of typical laser glass has received widespread attention in terms of research and application. Traditional high temperature melting method is often used for making neodymium-doped glass. However, this method has problems such as high melting temperature, long melting time, and in the meantime, the glass generates concentration quenching effect easily, which leads to low luminous efficiency of neodymium-doped glass. Therefore, exploring new preparation method to obtain excellent properties of neodymium-doped glass is of vital significance.In order to overcome the shortcomings of the traditional high temperature melting method, in this paper, mesoporous molecular sieve materials(SBA-15 and ZSM-5) are used as the initial powders, and neodymium-doped glass is finally prepared by the spark plasma sintering(SPS). The SPS technique belongs to solid phase sintering, and the sintering temperature is below the glass melting temperature, so the concentration quenching effect of rare earth ions can be effectively suppressed. The main research contents of this paper are as follows:(1) Preparation of highly transparent silica glass by SPS sintering of SBA-15 powder:Mesoporous silica SBA-15 with large surface area and ordered mesoporous channel is sintered to silica glass with high transparency and high density by SPS. The influence of sintering temperature(ranging from 1000 to 1040 ℃) on the property of the sintered samples is studied and the optimum sintering temperature is determined as 1040 ℃, which lays good foundation for the preparation of neodymium-doped glass.(2) Preparation of neodymium-doped silica glass by SPS sintering of neodymium-doped SBA-15 powder: The incipient wetness impregnation is adopted to realize the uniformly doping ofneodymiumnitratehexahydrateandsba-15 powder.withthehelpofsps,theneodymium-dopedglasseswithdifferentcontentsofneodymiumaresuccessfullyprepared.wecharacterizetheopticalpropertiesofthesamples,andtheresultsshowthattheabsorptionspectrawithintherangeof400-1000 nmhaveeightobviousabsorptionbands.underthe532nmexcitation,thefluorescencespectrashowsthreeobviousemissionbands,andtheluminescencecenterlocatesat910 nm,1080nmand1350nm.underthe808 nmexcitation,theluminescencecenterlocatesat905nm,1069nmand1330 nm.thespectrumsresultsshowthatneodymium-dopedsba-15 glassshowsstrongnearinfraredluminescentproperties.moreover,thehardnessisgraduallyreducedwiththeincreaseofneodymiumionsdopedconcentration.(3)preparationofneodymium-dopedsilicaglassbyspssinteringofneodymium-dopedzsm-5powder:zsm-5andneodymiumnitrateareusedastherawmaterials.throughthesamepreparationmethodofdopedpowder,theneodymium-dopedzsm-5glassissuccessfullypreparedwiththehelpofsps.thepropertiesofthesamplesarestudied.theabsorptionspectraintherangeof400-1000nmshowsfiveobviousabsorptionpeaksat526 nm,582nm,740 nm,805nmand874nmrespectively.underthe532 nmexcitation,thefluorescencespectrashowsthreeobviousemissionbands,andtheluminescencecenterlocatesat910 nm,1090nmand1350nm.underthe808 nmexcitation,theluminescencecenterlocatesat890nm,1070nmand1340 nm.neodymium-dopedzsm-5glassalsoshowsstrongnearinfraredluminescentproperties.inthispaper,wealsostudytheinfluenceofdifferentsinteringtemperatures(1300℃,1325℃,1350℃and1375℃)ontheopticalandmechanicalpropertiesofneodymium-dopedzsm-5glass.theresultsshowthatthebestneodymiumionsdopingconcentrationreducesalongwiththeincreaseofsinteringtemperature,however,theabsorptionpeakpositionsareconsistent.thehardnessvaluepresentsagraduallyincreasingtrendwiththeincreaseofsinteringtemperature.