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首页> 外文期刊>ACS Omega >Domain Structural Transition and Structural Heterogeneity in GeO2 Glass Under Densification
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Domain Structural Transition and Structural Heterogeneity in GeO2 Glass Under Densification

机译:致密化下GEO2玻璃中的结构域结构转变与结构异质性

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The domain structural transition and structural heterogeneity (SH) in GeO_(2) glass at 300 K and pressures up to 100 GPa are studied by means of molecular dynamics (MD) simulation. The results demonstrate that the structure of GeO_(2) glass comprises domain D4, domain D5, or domain D6, which depends strongly on pressure, where domain Dx (x = 4, 5, or 6) is a cluster of connected GeO_(x) units, in which all Ge atoms possess the same coordination number of x . In the range of 9–18 GPa, GeO_(2) glass undergoes a structural transformation from domain D4 to domain D6 via domain D5. Under densification, structural evolution occurs along with the O_(xx) → O_(xy) atom variation, which comprises the processes of both merging and splitting of domain Dx and the exchange of domain-boundary (DB) atoms. The densification leads to a decrease of the Voronoi polygon (VP) volume of atoms. We found that the coexistence of separate domain structures is the origin of spatial SH in GeO_(2) glass. Pressure-dependent structural heterogeneity in GeO_(2) glass is also discussed in detail.
机译:通过分子动力学(MD)模拟,研究了300k(2)玻璃中GeO_(2)玻璃中的结构转变和结构异质性(SH),高达100GPa的压力。结果表明,GeO_(2)玻璃的结构包括结构域D4,结构域D5或结构域D6,其在压力下强烈取决于压力,其中域D x( x = 4,5或6)是连接的Geo _(x)单元的群集,其中所有ge原子具有相同的 x的协调数。在9-18GPa的范围内,Geo_(2)玻璃通过域D5从域D4到域D6的结构变换。在致密化下,与O _(xx)→O _(xy)原子变化一起发生结构演变,其包括域D x的合并和分裂的过程和域的交换 - 普博(DB)原子。致密化导致Voronoi多边形(VP)原子体积的减少。我们发现单独的域结构的共存是Geo_(2)玻璃中的空间SH的起源。还详细讨论了Geo_(2)玻璃中的压力依赖性结构异质性。

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