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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effects of concurrent TeO_2 reduction and ZnO addition on elastic and structural properties of (90-x)TeO_2-10Nb_2O _5-(x)ZnO glass
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Effects of concurrent TeO_2 reduction and ZnO addition on elastic and structural properties of (90-x)TeO_2-10Nb_2O _5-(x)ZnO glass

机译：TeO_2的同时还原和ZnO的添加对（90-x）TeO_2-10Nb_2O _5-（x）ZnO玻璃的弹性和结构性能的影响

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摘要

Niobium-containing tellurite glass with starting composition of (90-x)TeO_2-10Nb_2O_5-(x)ZnO (x = 0-15 mol%) have been prepared by melt-quenching method and the effect of reduction of TeO _2 with simultaneous increase in ZnO on elastic properties was studied. Ultrasonic longitudinal and shear velocity showed initial decrease of 3.52% and 2.37%, respectively, at x = 5 mol%. For x > 5 mol%, longitudinal velocity showed weak recovery but shear velocity showed steady recovery with ZnO and recorded 0.95% increase in value at x = 15 mol% compared to x = 0 sample. Shear and Young's moduli recorded similar drop at x = 5 mol% followed by strong recovery at x > 5 mol%, while longitudinal and Bulk modulus showed weak and no recovery, respectively, with x. Infrared (IR) absorption spectra showed increase in intensity of NbO_6-assigned peak accompanied by increase in intensity of ZnO_4 tetrahedra and TeO_4 trigonal bipyramid (tbp) assigned peaks indicating formation of both non-bridging oxygen, NBO and bridging oxygen, BO, respectively, with addition of ZnO. The initial drop in ultrasonic velocity and related elastic moduli observed at x = 5 mol% indicates weakening of network rigidity of the glass system due to structural modification as a direct effect of TeO_2 reduction and existence of NBO. However, further replacement of TeO_2 by ZnO at x > 5 mol% contributed to increase in BO causing rigidity of the glass network to improve. In addition, hardness, H, was observed to increase with ZnO indicating increase in connectivity of the glass network while Poisson's ratio, σ, decreased indicating increase in cross-link density of the glass system. The combined results of ultrasonic velocity and IR absorption spectra suggest that the role of TeO_2 is very critical in the ternary glass system as, although ZnO addition showed improved rigidity due to recovery of shear modulus, the weakening of longitudinal and Bulk moduli indicates ZnO is not fully effective as glass former in place of TeO_2.
机译：采用熔融淬火法制备了起始成分为（90-x）TeO_2-10Nb_2O_5-（x）ZnO（x = 0-15 mol％）的含铌碲酸盐玻璃，同时降低了TeO _2的还原效果在ZnO中对弹性性能进行了研究。在x = 5 mol％时，超声纵向和剪切速度分别显示出初始下降3.52％和2.37％。对于x> 5 mol％，纵向速度显示出较弱的恢复，但是剪切速度显示出使用ZnO的稳定恢复，并且与x = 0样品相比，x = 15 mol％时记录的值增加了0.95％。剪切和杨氏模量在x = 5 mol％时记录到类似的下降，然后在x> 5 mol％时出现强恢复，而纵向模量和本体模量在x时分别显示弱和无恢复。红外（IR）吸收光谱显示NbO-6分配峰的强度增加，同时ZnO_4四面体和TeO_4三角双锥体（tbp）分配峰的强度增加，表明分别形成了非桥接氧NBO和桥接氧BO。加上ZnO在x = 5 mol％处观察到的超声速度和相关弹性模量的初始下降表明，由于TeO_2还原和NBO存在的直接影响，结构改性导致玻璃系统的网络刚性减弱。然而，x> 5 mol％的ZnO进一步替代TeO_2有助于提高BO，从而提高玻璃网络的刚性。另外，观察到硬度H随ZnO而增加，表明玻璃网络的连通性增加，而泊松比σ降低，表明玻璃系统的交联密度增加。超声速度和红外吸收光谱的综合结果表明，TeO_2在三元玻璃体系中的作用非常关键，因为尽管添加的ZnO由于剪切模量的恢复而提高了刚度，但纵向模量和体模量的减弱表明ZnO并不完全有效地代替TeO_2作为玻璃成型剂。

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