Heterogeneous crystal nucleation of supercooled lithium disilicate melt in glassy carbon containers
Heterogeneous crystal nucleation of supercooled lithium disilicate melt in glassy carbon containers
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DOI：
10.1016/j.jnoncrysol.2021.121068
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发表时间：
2021-11
影响因子：
3.5
通讯作者：
R. Al-Mukadam;J. Deubener
中科院分区：
文献类型：
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作者：
R. Al-Mukadam;J. Deubener
采用重复扫描量热法（RS-DSC）研究了过冷二硅酸锂熔体在玻碳容器中的非均匀形核过程。由于润湿性差，液体在300次运行中的每次运行中形成接近球形的液滴。二硅酸锂（LS 2）晶体在液滴的表面生长。拉曼映射揭示了在晶体中心的碳颗粒，推测为LS 2的结晶播种。通过平均等待时间（等温RS-DSC）和平均过冷度（等时RS-DSC）的统计方法确定了LS 2的非均匀晶体成核速率。LS 2的最大成核速率是两个数量级更大，在约270 K更深的过冷比以前报道的处理二硅酸锂熔体在贵金属容器。
Repetitive-scanning calorimetry (RS-DSC) was used to study the heterogeneous crystal nucleation of supercooled lithium disilicate melt in glassy carbon containers. Due to the poor wetting, the liquid formed a nearly spherical droplet in each of the 300 runs. Lithium disilicate (LS2) crystals grew at the surface of the droplet. Raman mapping revealed carbon particles in the center of the crystals presumably seeding the crystallization of LS2. Heterogeneous crystal nucleation rates of LS2 were determined by the statistical method from the mean waiting time (isothermal RS-DSC) and the mean supercooling (isochronal RS-DSC). The maximum nucleation rate of LS2 was two orders of magnitude larger and at approximately 270 K deeper supercooling than previously reported for treating lithium disilicate melt in noble metal containers.