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Title: Phase transition induced strain in ZnO under high pressure

Under high pressure, the phase transition mechanism and mechanical property of material are supposed to be largely associated with the transformation induced elastic strain. However, the experimental evidences for such strain are scanty. The elastic and plastic properties of ZnO, a leading material for applications in chemical sensor, catalyst, and optical thin coatings, were determined using in situ high pressure synchrotron axial and radial x-ray diffraction. The abnormal elastic behaviors of selected lattice planes of ZnO during phase transition revealed the existence of internal elastic strain, which arise from the lattice misfit between wurtzite and rocksalt phase. Furthermore, the strength decrease of ZnO during phase transition under non-hydrostatic pressure was observed and could be attributed to such internal elastic strain, unveiling the relationship between pressure induced internal strain and mechanical property of material. Ultimately, these findings are of fundamental importance to understanding the mechanism of phase transition and the properties of materials under pressure.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6]
  1. Sichuan Univ., Chengdu (China). Institute of Atomic and Molecular Physics; Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
  2. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China); Chinese Academy of Sciences, Guiyang, Guizhou (China). Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry
  3. Chinese Academy of Sciences, Beijing (China). Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics
  4. Carnegie Inst. of Washington, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT)
  5. Sichuan Univ., Chengdu (China). Institute of Atomic and Molecular Physics; Institute of Fluid Physics and National Key Laboratory of Shockwave and Detonation Physics (China); Academy of Engineering Physics, Mianyang (China)
  6. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
Publication Date:
OSTI Identifier:
1282100
Grant/Contract Number:
NA0001974; AC02-06CH11357; FG02-99ER45775
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Carnegie Institute of Washington
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE lower mantle; transformation; diamond; nucleation; perovskite; mechanism; graphite; wurtzite; olivine; zincite