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Evidence for intermediate phase in solid electrolyte glasses .

机译：固体电解质玻璃中间相的证据。

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摘要

Here we examine a dry solid electrolyte (AgI)x(AgPO3 )1-x glasses in the 0 x 0.54 composition range, and provide evidence for existence of the three generic elastic phases ( floppy, intermediate (IP) and stressed Rigid). IPs are marginally rigid elastic phases with unusual functionalities and excited much interest in the field. Our experiments have included Raman scattering, Infrared reflectance, modulated differential scanning Calorimetry (MDSC), AC electrical conductivity and molar volume experiments. Our experiments reveal that the physical properties of these glasses including the glass transition temperatures (Tgs) and the elastic phases display substantial dependence on handling of precursors in synthesis of samples.;Previous reports on Tgs of AgPO3 base glass lie in the 163 degC Tg 192 °C range when precursors are processed at laboratory ambient (relative humidity (RH) ∼ 50 percent). However, we found that as RH decreases, Tgs steadily increase in the 181(2)°C Tg 254(2)°C range. Tg of dry AgPO3 is found to be 254(2)°C. Infrared reflectance shows the concentration of both free and bonded water increases in the low-Tg (181(2)°C) compared with the high-T g (254(2) °C) samples. In Raman scattering, the Boson peak scattering strength increases, and the scattering strength ratio, R, of the P-O t (terminal) to P-Ob (bridging) mode of the P-O-P-chains decreases as sample Tgs increase.;Moving next to (AgI)x(AgPO3)1-x glasses, calorimetric measurements have permitted establishing glass compositions across which Tg become thermally reversing, the reversibility window (RW), also identified with IPs which fixes the three elastic phases. Results on driest glasses (set A) show RW to be in the 0.095 x 0.378 range, and for the less dry samples (set B) in the 0.22 x 0.35 range. Variations in Raman mode frequency of the P-Ot stretch vibration of chains, upsilon (x), has permitted a measurement of optical elasticity power-laws; in the stressed-rigid phase the power-law is found to be p1 = 1.25(2), and in the flexible phase p2 = 0.98(3). These values corroborate the elastic phase identifications. Ionic conductivities reveal a step-like increase when glasses become stress-free at x > xc(1) = 0.095, and a logarithmic increase in conductivity (sigma ∼ (x-xc(2) ^mu) once they become flexible at x > xc(2) = 0.378 witha power-law mu = 1.78 (10). The power-law is consistent with percolation of 3D filamentary conduction pathways. Ideas on network flexibility promoting ion-conduction are in harmony with the unified approach of Ingram et al. who have emphasized the similarity of process compliance or elasticity relating to ion-transport and structural relaxation in decoupled systems. Boson mode frequency and scattering strength display thresholds that coincide with the two elastic phase boundaries. In particular, the scattering strength of the boson mode increases almost linearly with glass composition x, with a slope that tracks the floppy mode fraction as a function of mean coordination number r predicted by mean-field rigidity theory. These data suggest that the excess low frequency vibrations contributing to boson mode in flexible glasses come largely from floppy modes.
机译：在这里，我们研究了成分范围为0 xc（1）= 0.095时变得无应力时，离子电导率显示出阶梯状增加，并且在x> xc变得柔韧性时，电导率（sigma〜（x-xc（2）^ mu）对数增加。 xc（2）= 0.378，幂律μ= 1.78（10）。幂律与3D丝状传导路径的渗漏一致，促进离子传导的网络柔性思想与Ingram等人的统一方法一致谁强调了在解耦系统中与离子迁移和结构弛豫有关的过程顺应性或弹性的相似性，玻色子模式频率和散射强度显示的阈值与两个弹性相界一致，特别是玻色子模式的散射强度随玻璃成分x的增加几乎呈线性增加，其斜率可根据平均场刚度理论预测的平均坐标数r跟踪软盘模式分数，这些数据表明，多余的低频v导致柔性眼镜的玻色子模式的振动主要来自软盘模式。

著录项

  • 作者

    Novita, Deassy I.;

  • 作者单位

    University of Cincinnati.;

  • 授予单位 University of Cincinnati.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 137 p.
  • 总页数 137
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

  • 入库时间 2022-08-17 11:38:25

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