结晶
材料科学
亚稳态
成核
纳米尺度
纳米晶
氧化物
非阻塞I/O
分析化学(期刊)
矿物学
结晶学
化学工程
热力学
纳米技术
化学
冶金
生物化学
物理
有机化学
色谱法
工程类
催化作用
作者
Takayuki Komatsu,Tsuyoshi Honma
摘要
Abstract Nanoscale composition fluctuations in Li 2 O–SiO 2 ‐based glasses were analyzed and discussed from the data on the structure and crystallization process reported so far to enter deeply into the medium‐range ordered structure of multicomponent oxide glasses. Li 2 O is proposed to have a strong tendency for dynamical heterogeneous structure, that is, the formation of fragile Li 2 O‐rich regions with small SiO 2 contents, resulting in the initial crystallization of metastable Li 2 SiO 3 prior to the formation of stable Li 2 Si 2 O 5 in Li 2 O–2SiO 2 ‐based glasses. Li 2 O–Ga 2 O 3 /Nb 2 O 5 –SiO 2 glasses are proposed to have nanoscale composition fluctuations of Li 2 O–Ga 2 O 3 /Nb 2 O 5 ‐rich regions, resulting in the initial formation of LiGa 5 O 8 and LiNbO 3 nanocrystals. In Li 2 O–Al 2 O 3 –SiO 2 glasses, the distribution width of composition fluctuations is proposed to be narrow, resulting in the initial crystallization of metastable β‐quartz solid solutions Li 2 O·Al 2 O 3 · n SiO 2 ( n = 6–8). Additive P 2 O 5 and NiO leading to an enhanced nucleation are proposed to be present in fragile Li 2 O‐rich regions.
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