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High niobium oxide content in germanate glasses: Thermal, structural, and optical properties
【文件类型】 【消费金额】0.3 【文章页数】1 【会员操作】  
【文章作者】Marcondes Lia Mara;Maestri S閞gio;Sousa Bianca;Gon?alves Rogeria Rocha;Cassanjes Fabia Castro;Poirier Gael Yves
【文章摘要】      Abstract

Niobium alkali germanate glasses were synthesized by the melt‐quenching technique. The ternary system (90‐x)GeO2xNb2O5–10K2O forms homogeneous glasses with x ranging from 0 to 20 mol%. Samples were investigated byDSCandXRDanalysis,FTIRand Raman spectroscopy, and optical absorption. Structural and physical features are discussed in terms of Nb2O5content. The niobium content increase in the glass network strongly modifies the thermal, structural and optical properties of alkali germanate glasses.DSC, Raman andFTIRanalysis suggest niobium addition promotes NbO6groups insertion close to GeO4units of the glass network.XRDanalysis also pointed out that samples containing high niobium oxide contents exhibit preferential niobium oxide‐rich phase after crystallization after heat treatment, which is similar to orthorhombic Nb2O5. Absorption spectra revealed high transmission range between 400 nm to 6.2 μm, added to a considerably decreased hydroxyl group content as the addition of niobium in the alkali germanate network. The niobium oxide‐rich phase crystallization process was studied and activation energy was determined, as well as nucleation and crystal growth temperatures and time for obtaining transparent glass‐ceramics.

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【卷】101【ISSUE】1【ISSUEID】815B0005    【文章期份】2018    【发布日期】2018/8/28 16:25:08    点击率:0    打印    关闭
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