Anomalous compression behavior of similar to 12nm nanocrystalline TiO2

doi:10.1063/1.4984918

	Anomalous compression behavior of similar to 12nm nanocrystalline TiO2
	Nan, XL; Liu J(刘景); He, DW; Zhu, WJ; Liu, J; Wang, P; Hu, QW; Lei, L; Peng, F; Li, SR
刊名	JOURNAL OF APPLIED PHYSICS
	2017
卷号	121 期号:21 页码:215109
ISSN号	0021-8979
DOI	10.1063/1.4984918
文献子类	Article
英文摘要	When the grain size decreases, there inevitably exists a critical size (d(c)) where the contribution of surface atoms to the physical properties is competitive with that of the interior atoms, giving rise to a wide variety of new phenomena. The behavior of granular materials near d(c) is particularly interesting because of the crossover, a continuous transition from one type of mechanism to another. In situ high-pressure x-ray diffraction experiments showed that the compression curve of nanocrystalline anatase TiO2 with grain size near d(c) reached a platform after about 5%-6% of deformation under hydrostatic compression. Eventually, the unit cell volume of anatase expanded at similar to 14-16 GPa. We propose that the anomalous compression behavior is attributed to the formation and thickening of the stiff high density amorphous shell under high pressure, giving rise to a great arching effect at the grain boundary at the nanolevel. This process results in a remarkable difference in stress between inside and outside of the shell, generating the illusions of the hardening and the negative compressibility. This study offers a new insight into the mechanical properties of nanomaterials under extreme conditions. Published by AIP Publishing.
电子版国际标准刊号	1089-7550
WOS关键词	X-RAY-DIFFRACTION ; HIGH-PRESSURE ; ANATASE TIO2 ; CATION MIGRATION ; SIZE ; TRANSITION ; STABILITY ; EXPANSION ; NANOPARTICLES ; GPA
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000407490100005
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284795]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Nan, XL,Liu J,He, DW,et al. Anomalous compression behavior of similar to 12nm nanocrystalline TiO2[J]. JOURNAL OF APPLIED PHYSICS,2017,121(21):215109.
APA	Nan, XL.,刘景.,He, DW.,Zhu, WJ.,Liu, J.,...&Wang, QM.(2017).Anomalous compression behavior of similar to 12nm nanocrystalline TiO2.JOURNAL OF APPLIED PHYSICS,121(21),215109.
MLA	Nan, XL,et al."Anomalous compression behavior of similar to 12nm nanocrystalline TiO2".JOURNAL OF APPLIED PHYSICS 121.21(2017):215109.