Unraveling the Crystallization Kinetics of Supercooled Liquid GeTe by Ultrafast Calorimetry

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	Unraveling the Crystallization Kinetics of Supercooled Liquid GeTe by Ultrafast Calorimetry
	Chen, Yimin; Wang, Guoxiang; Song, Lijian; Shen, Xiang; Wang, Junqiang; Huo, Juntao; Wang, Rongping; Xu, Tiefeng; Dai, Shixun; Nie, Qiuhua
刊名	CRYSTAL GROWTH & DESIGN
	2017
卷号	17 期号:7 页码:3687-3693
ISSN号	1528-7483
英文摘要	Crystallization kinetics of phase change materials (PCMs) at high temperatures is of key importance for the extreme speed of data writing and erasing. In this work, the crystallization behavior of one of the typical PCMs, GeTe, has been studied using ultrafast differential scanning calorimetry (DSC) at high heating rates up to 4 x 104 K s(-1). A strong non-Arrhenius temperature-dependent viscosity has been observed. We considered two viscosity models for estimating the crystal growth kinetics coefficient (U-kin). The results showed that the MYEGA model was more suitable to describe the temperature-dependent viscosity and the crystal growth kinetics for supercooled liquid GeTe. The glass transition temperature (T-g) and fragility m were estimated to be 432.1 K and 130.7, respectively. The temperature-dependent crystal growth rates, which were extrapolated by the MYEGA model, were in line with the experimental results that were measured by in situ transmission electron microscopy at a given temperature. The crystal growth rate reached a maximum of 3.5 m s(-1) at 790 K. These results based on ultrafast DSC with the MYEGA model offer a revelation for crystallization kinetics of supercooled liquid GeTe.
公开日期	2017-12-25
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/13756]
专题	2017专题
推荐引用方式 GB/T 7714	Chen, Yimin,Wang, Guoxiang,Song, Lijian,et al. Unraveling the Crystallization Kinetics of Supercooled Liquid GeTe by Ultrafast Calorimetry[J]. CRYSTAL GROWTH & DESIGN,2017,17(7):3687-3693.
APA	Chen, Yimin.,Wang, Guoxiang.,Song, Lijian.,Shen, Xiang.,Wang, Junqiang.,...&Nie, Qiuhua.(2017).Unraveling the Crystallization Kinetics of Supercooled Liquid GeTe by Ultrafast Calorimetry.CRYSTAL GROWTH & DESIGN,17(7),3687-3693.
MLA	Chen, Yimin,et al."Unraveling the Crystallization Kinetics of Supercooled Liquid GeTe by Ultrafast Calorimetry".CRYSTAL GROWTH & DESIGN 17.7(2017):3687-3693.