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DYNAMIC OXIDATION AND THE STRUCTURE AND CRYSTALLINE NUCLEATION OF ALUMINOSILICATE GLASSES AND MELTS

机译:硅铝硅酸盐玻璃和熔化的动态氧化与结构和结晶成核

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The dynamics of oxidation reactions in transition-metal-cation-bearing aluminosilicate glasses and melts involves the coupled diffusion of electron boles (polarons) and component network-modifying cations -- a kinetic response orders-of-magnitude faster than any involving the diffusive motion of an oxygen species. Oxidation causes a fundamental change of the amorphous structure, with various results as a function of composition. In Fe~(2+)-doped glasses devoid of alkali oxides, oxidation results in the homogeneous nucleation of a crystalline ferrite at an internal front; in glasses containing alkali oxides, crystalline nucleation does not occur, rather, the alkali ions stabilize Fe~(3+) as a network former. The dynamics allow an indirect evaluation of percolation theory -- the Modified Random Network model -- in such glasses: oxidation experiments on a Fe~(2+)-doped calcium-magnesium aluminosilicate glass at different oxidation potentials give reaction morphologies indicative of a percolation threshold for the alkaline earth modifying oxides of approx 10 volume percent.
机译:过渡金属阳离子铝硅酸盐玻璃和熔体中氧化反应的动态涉及电子硼(PIGONS)和部件网络改性阳离子的耦合扩散 - 比任何涉及扩散动作的动力学响应顺序氧气种类。氧化导致无定形结构的基本变化,各种结果作为组合物的功能。在Fe〜(2 +) - 掺杂玻璃缺乏碱氧化物的玻璃,氧化导致在内部前沿的结晶铁氧体的均匀成核;在含有碱氧化物的眼镜中,不发生晶体成核,而是碱性核心稳定为网络前的Fe〜(3+)。动态允许间接评估渗滤理论 - 改进的随机网络模型 - 在这种眼镜中:在不同氧化电位下的Fe〜(2 +)掺杂钙镁铝硅酸盐玻璃上的氧化实验给出了指示渗透的反应形态碱性地球的阈值改性约10体积%的氧化物。

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