Fragile-to-strong crossover in optimized In-Sb-Te phase-change supercooled liquids
Fragile-to-strong crossover in optimized In-Sb-Te phase-change supercooled liquids
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优化的 In-Sb-Te 相变过冷液体中的脆性到强性的交叉
DOI：
10.1103/physrevmaterials.4.033403
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发表时间：
2020
影响因子：
3.4
通讯作者：
Xu Tiefeng
中科院分区：
文献类型：
--
作者：
Chen Yimin;Gu Jierong;Zhang Qian;Mao Yuanen;Wang Guoxiang;Wang Rongping;Shen Xiang;Wang Jun-Qiang;Xu Tiefeng
我们制备了In掺杂的SbxTey（x：y = 2：3，1：1，3：1，4：1）相变薄膜，并研究了它们的晶化温度、激活能和光学带隙等物理性质。在此基础上，当In含量为20原子时，可以找到热稳定性和晶化速度之间的平衡。%.因此，我们进一步研究了它们的结晶动力学，使用闪光差示扫描量热法和推广的Mauro-Yue-Ellison-Gupta-Allan粘度模型来研究In-20（Sb 2 Te）（80），In-20（SbTe）（80），In-20（Sb 3 Te）（80）和In-20（Sb 4 Te）（80）过冷液体中潜在的脆强交叉（FSC）。结果表明，In-20（Sb_3Te）（80）晶体具有2.4的大交叉幅度（f），具有明显的FSC行为，但其最大晶体生长速率（U-max）仅为0.047 m·s ~（-1），不能满足高速相变应用的要求。In_3Sb_（17）Te_（32）晶体的生长速率为0.08m·s ~（-1），无明显的FSC。In-20（Sb 4 Te）（80）具有较大的Umax（0.425 m s（-1））和明显的FSC行为（f值为2.6），这大于典型的相变过冷液体Ag 5.5In 6.5Sb 59 Te 29。结果有力地支持了明显的FSC现象只在某些相变过冷液体中是唯一的，而不是普遍的动力学特征。
We have deposited In-doped SbxTey (x : y = 2 : 3, 1:1, 3:1, 4:1) phase-change films, and studied their physics properties like crystallization temperature, activation energy, and optical band gap. On the basis of these parameters, a balance between thermal stability and crystallization speed can be found when In content is 20 at. %. We thus further studied their crystallization kinetics using the flash differential scanning calorimetry and the generalized Mauro-Yue-Ellison-Gupta-Allan viscosity model to investigate the potential fragile-to-strong crossover (FSC) in In-20(Sb2Te3)(80), In-20(SbTe)(80), In20(Sb3Te)(80), and In-20(Sb4Te)(80) supercooled liquids. It was found that, In-20(Sb3Te)(80) has a large crossover magnitude (f) of 2.4 with a distinct FSC behavior, but its maximum crystal growth rate (U-max) of 0.047 m s(-1) is too low to satisfy the high-speed phase-change application. The crystal growth rate of In3SbTe2 (In51Sb17Te32) was found to be 0.08 m s(-1) without distinct FSC. In contrast, In-20(Sb4Te)(80) was demonstrated to have a larger Umax of 0.425 m s(-1) and a distinct FSC behavior with a f value of 2.6, which is larger than that of typical phase-change supercooled liquid Ag5.5In6.5Sb59Te29. The results strongly support that, obvious FSC is unique only in some phase-change supercooled liquids, but not a universal dynamic feature.