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Uncovering the crystal defects within aragonite CaCO3
San, Xingyuan1,2; Gong, Mingyu3; Wang, Jian4; Ma, Xiuliang2; dos Reis, Roberto5,6; Smeets, Paul J. M.5,6; Dravid, Vinayak P.5,6; Hu, Xiaobing2,5,6
Corresponding AuthorWang, Jian(jianwang@unl.edu) ; Ma, Xiuliang(xlma@imr.ac.cn) ; Dravid, Vinayak P.(v-dravid@northwestern.edu) ; Hu, Xiaobing(xbhu@northwestern.edu)
2022-04-05
Source PublicationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
Volume119Issue:14Pages:9
AbstractKnowledge 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.
Keywordbiological material aragonite crystal defects organics
Funding OrganizationNational 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)
DOI10.1073/pnas.2122218119
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000786513200004
PublisherNATL ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/172609
Collection中国科学院金属研究所
Corresponding AuthorWang, Jian; Ma, Xiuliang; Dravid, Vinayak P.; Hu, Xiaobing
Affiliation1.Hebei Univ, Coll Phys Sci & Technol, Hebei Key Lab Opt Elect Informat & Mat, Baoding 071002, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
3.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
4.Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68583 USA
5.Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
6.Northwestern Univ, Atom & Nanoscale Characterizat Expt Ctr, Evanston, IL 60208 USA
Recommended Citation
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.
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