Uncovering the crystal defects within aragonite CaCO3

doi:10.1073/pnas.2122218119

CORC > 金属研究所 > 中国科学院金属研究所

	Uncovering the crystal defects within aragonite CaCO3
	San, Xingyuan 2,3; Gong, Mingyu 4; Wang, Jian 5; Ma, Xiuliang 3; dos Reis, Roberto 1,6; Smeets, Paul J. M.1,6; Dravid, Vinayak P.1,6; Hu, Xiaobing 1,3,6
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2022-04-05
卷号	119 期号:14 页码:9
关键词	biological material aragonite crystal defects organics
ISSN号	0027-8424
DOI	10.1073/pnas.2122218119
通讯作者	Wang, Jian(jianwang@unl.edu) ; Ma, Xiuliang(xlma@imr.ac.cn) ; Dravid, Vinayak P.(v-dravid@northwestern.edu) ; Hu, Xiaobing(xbhu@northwestern.edu)
英文摘要	Knowledge of deformation mechanisms in aragonite, one of the three crystalline polymorphs of CaCO3, is essential to understand the overall excellent mechanical performance of nacres. Dislocation slip and deformation twinning were claimed previously as plasticity carriers in aragonite, but crystallographic features of dislocations and twins have been poorly understood. Here, utilizing various transmission electron microscopy techniques, we reveal the atomic structures of twins, partial dislocations, and associated stacking faults. Combining a topological model and density functional theory calculations, we identify complete twin elements, characters of twinning disconnection, and the corresponding twin shear angle (similar to 8.8 degrees) and rationalize unique partial dislocations as well. Additionally, we reveal an unreported potential energy dissipation mode within aragonite, namely, the formation of nanograins via the pile-up of partial dislocations. Based on the microstructural comparisons of biogenic and abiotic aragonite, we find that the crystallographic features of twins are the same. However, the twin density is much lower in abiotic aragonite due to the vastly different crystallization conditions, which in turn are likely due to the absence of organics, high temperature and pressure differences, the variation in inorganic impurities, or a combination thereof. Our findings enrich the knowledge of intrinsic crystal defects that accommodate plastic deformation in aragonite and provide insights into designing bioengineering materials with better strength and toughness.
资助项目	National Natural Science Foundation of China[51901065] ; Nature Science Foundation of Hebei Province[E2020201023] ; Advanced Talents Incubation Program of the Hebei University[521000981164] ; Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF)[ECCS-2025633] ; International Institute of Nanotechnology (IIN) ; Northwestern's Materials Research Science and Engineering Center (MRSEC) program (NSF)[DMR-1720139]
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATL ACAD SCIENCES
WOS记录号	WOS:000786513200004
资助机构	National Natural Science Foundation of China ; Nature Science Foundation of Hebei Province ; Advanced Talents Incubation Program of the Hebei University ; Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) ; International Institute of Nanotechnology (IIN) ; Northwestern's Materials Research Science and Engineering Center (MRSEC) program (NSF)
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/172608]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, Jian; Ma, Xiuliang; Dravid, Vinayak P.; Hu, Xiaobing
作者单位	1.Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA 2.Hebei Univ, Coll Phys Sci & Technol, Hebei Key Lab Opt Elect Informat & Mat, Baoding 071002, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 4.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China 5.Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68583 USA 6.Northwestern Univ, Atom & Nanoscale Characterizat Expt Ctr, Evanston, IL 60208 USA
推荐引用方式 GB/T 7714	San, Xingyuan,Gong, Mingyu,Wang, Jian,et al. Uncovering the crystal defects within aragonite CaCO3[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2022,119(14):9.
APA	San, Xingyuan.,Gong, Mingyu.,Wang, Jian.,Ma, Xiuliang.,dos Reis, Roberto.,...&Hu, Xiaobing.(2022).Uncovering the crystal defects within aragonite CaCO3.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,119(14),9.
MLA	San, Xingyuan,et al."Uncovering the crystal defects within aragonite CaCO3".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 119.14(2022):9.