Structure and Fragility of Zn-phosphate glasses: Results from multinuclear NMR spectroscopy and calorimetry
Structure and Fragility of Zn-phosphate glasses: Results from multinuclear NMR spectroscopy and calorimetry
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DOI：
10.1016/j.jnoncrysol.2022.121395
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发表时间：
2022-03
影响因子：
3.5
通讯作者：
Yiqing Xia;Hao Chen;I. Hung;Z. Gan;S. Sen
中科院分区：
文献类型：
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作者：
Yiqing Xia;Hao Chen;I. Hung;Z. Gan;S. Sen
用~（31）P和超高场~（67）Zn核磁共振谱研究了（ZnO）_x（P_2O_5）_（100-x）（35≤x≤ 67）玻璃的结构。~（31）P NMR结果证实了近二进制Q-物种分布。在35≤x≤ 55的组成范围内，ZnO的加入使磷酸盐网络的连通性逐渐降低。~（67）Zn NMR谱表明，Zn-O平均配位数在4 ~ 6之间变化，并随Zn含量的增加而增加。Zn-O-P网络的连接性的增加补偿了P-O-P网络的解聚，这反映在Tg> 55的组成趋势的逆转中。与Tg相反，脆性指数m显示出可忽略的组成依赖性，直到x ≥ 50，超过此值，它随着Zn含量的增加而迅速增加，响应于Q2链的逐渐缩短。
The structure of (ZnO)x(P2O5)100-xglasses with 35≤x≤ 67 is investigated using31P and ultra-high field67Zn NMR spectroscopy. The31P NMR results confirm a nearly binary Q-species distribution. The progressive decrease in the connectivity of the phosphate network upon addition of ZnO is manifested in a monotonic drop inTgin the composition range 35≤x≤ 55. The67Zn NMR spectra indicate that the average Zn-O coordination number varies between 4 and 6 and increases progressively with increasing Zn content. The resulting increase in the connectivity of the Zn-O-P network compensates for the depolymerization of the P-O-P network, which is reflected in a reversal in the compositional trend inTgforx> 55. In contrast toTg, the fragility indexmshows negligible composition dependence until x∼50, beyond which it increases rapidly with increasing Zn content in response to the progressive shortening of the Q2chains.