title: Phase transition induced strain in ZnO under high pressure.
abstract: 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. These findings are of fundamental importance to understanding the mechanism of phase transition and the properties of materials under pressure.
authors.affiliation: Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China.|Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, P. R. China.
authors.forename: Xiaozhi
authors.initials: X
authors.lastname: Yan
authors.affiliation: Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, P. R. China.|Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550081, China.
authors.forename: Haini
authors.initials: H
authors.lastname: Dong
authors.affiliation: Beijing Synchrotron Radiation Laboratory, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, P. R. China.
authors.forename: Yanchun
authors.initials: Y
authors.lastname: Li
authors.affiliation: HPCAT, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, US.
authors.forename: Chuanlong
authors.initials: C
authors.lastname: Lin
authors.affiliation: HPCAT, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, US.
authors.forename: Changyong
authors.initials: C
authors.lastname: Park
authors.affiliation: Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China.|Institute of Fluid Physics and National Key Laboratory of Shockwave and Detonation Physic, China Academy of Engineering Physics, Mianyang 621900, P. R. China.
authors.forename: Duanwei
authors.initials: D
authors.lastname: He
authors.affiliation: Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, P. R. China.|High Pressure Synergetic Consortium (HPSynC), Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA.
authors.forename: Wenge
authors.initials: W
authors.lastname: Yang