Approaching extremely low thermal conductivity by crystal structure engineering in Mg2Al4Si5O18

IMR OpenIR

	Approaching extremely low thermal conductivity by crystal structure engineering in Mg2Al4Si5O18
	Li, Yiran; Wang, Jiemin; Wang, Jingyang; jywang@imr.ac.cn
	2015
发表期刊	JOURNAL OF MATERIALS RESEARCH
ISSN	0884-2914
卷号	30 期号:24 页码:3729-3739
摘要	One of the challenges in developing a low thermal conductivity material addresses on searching lightweight ceramic without heavy or rare-earth (RE) elements. Mg2Al4Si5O18 interests us for its very low density and complex crystal structure. The first-principle calculations were performed to predict mechanical and lattice thermal conductivity of hexagonal and orthorhombic phases of Mg2Al4Si5O18. According to Debye approximation and the Slack model, the lattice thermal conductivity varies with temperature in 804.6/T and 719.7/T, yielding 2.95 and 2.64 W/(m.K) at room temperature, respectively. The high temperature limits of thermal conductivities are as low as 1.33 and 1.29 W/(m.K). The thermal conductivities of both polymorphs of Mg2Al4Si5O18 are lower than most of RE-containing silicates and zirconates. The present work suggests that Mg2Al4Si5O18 is a promising lightweight ceramic with extremely low thermal conductivity. We also highlight that enhancing complexity of the crystal structure rather than incorporating heavy RE elements may be an alternative wisdom to explore lightweight thermal insulators.
部门归属	[li, yiran ; wang, jiemin ; wang, jingyang] chinese acad sci, inst met res, shenyang natl lab mat sci, high performance ceram div, shenyang 110016, peoples r china ; [li, yiran] univ chinese acad sci, beijing 100049, peoples r china
资助者	Natural Sciences Foundation of China [51032006, 51372252]
收录类别	sci
语种	英语
WOS记录号	WOS:000367336300001
引用统计	被引频次：17[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/74639
专题	中国科学院金属研究所
通讯作者	jywang@imr.ac.cn
推荐引用方式 GB/T 7714	Li, Yiran,Wang, Jiemin,Wang, Jingyang,et al. Approaching extremely low thermal conductivity by crystal structure engineering in Mg2Al4Si5O18[J]. JOURNAL OF MATERIALS RESEARCH,2015,30(24):3729-3739.
APA	Li, Yiran,Wang, Jiemin,Wang, Jingyang,&jywang@imr.ac.cn.(2015).Approaching extremely low thermal conductivity by crystal structure engineering in Mg2Al4Si5O18.JOURNAL OF MATERIALS RESEARCH,30(24),3729-3739.
MLA	Li, Yiran,et al."Approaching extremely low thermal conductivity by crystal structure engineering in Mg2Al4Si5O18".JOURNAL OF MATERIALS RESEARCH 30.24(2015):3729-3739.