Thermal Conductivity during Phase Transitions

doi:10.1002/adma.201806518

	Thermal Conductivity during Phase Transitions
	Chen, Hongyi; Yue, Zhongmou; Ren, Dudi; Zeng, Huarong; Wei, Tianran; Zhao, Kunpeng; Yang, Ronggui; Qiu, Pengfei; Chen, Lidong; Shi, Xun
刊名	ADVANCED MATERIALS
	2019-02-08
卷号	31 期号:6
关键词	phase transition thermal conductivity thermal diffusivity thermoelectric materials
ISSN号	0935-9648
DOI	10.1002/adma.201806518
文献子类	Article
英文摘要	Thermal conductivity is a very basic property that determines how fast a material conducts heat, which plays an important and sometimes a dominant role in many fields. However, because materials with phase transitions have been widely used recently, understanding and measuring temperature-dependent thermal conductivity during phase transitions are important and sometimes even questionable. Here, the thermal transport equation is corrected by including heat absorption due to phase transitions to reveal how a phase transition affects the measured thermal conductivity. In addition to the enhanced heat capacity that is well known, it is found that thermal diffusivity can be abnormally lowered from the true value, which is also dependent on the speed of phase transitions. The extraction of the true thermal conductivity requires removing the contributions from both altered heat capacity and thermal diffusivity during phase transitions, which is well demonstrated in four selected kinds of phase transition materials (Cu2Se, Cu2S, Ag2S, and Ag2Se) in experiment. This study also explains the lowered abnormal thermal diffusivity during phase transitions in other materials and thus provides a novel strategy to engineer thermal conductivity for various applications.
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	WILEY-V C H VERLAG GMBH
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/27338]
专题	中国科学院上海硅酸盐研究所
推荐引用方式 GB/T 7714	Chen, Hongyi,Yue, Zhongmou,Ren, Dudi,et al. Thermal Conductivity during Phase Transitions[J]. ADVANCED MATERIALS,2019,31(6).
APA	Chen, Hongyi.,Yue, Zhongmou.,Ren, Dudi.,Zeng, Huarong.,Wei, Tianran.,...&Shi, Xun.(2019).Thermal Conductivity during Phase Transitions.ADVANCED MATERIALS,31(6).
MLA	Chen, Hongyi,et al."Thermal Conductivity during Phase Transitions".ADVANCED MATERIALS 31.6(2019).