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Title: Compressional behavior of omphacite to 47 GPa

Omphacite is an important mineral component of eclogite. Single crystal synchrotron X-ray diffraction data on natural (Ca,Na)(Mg,Fe,Al)Si 2O 6 omphacite have been collected at the Advanced Photon Source beamlines 13-BM-C and 13-ID-D up to 47 GPa at ambient temperature. Unit cell parameter and crystal structure refinements were carried out to constrain the isothermal equation of state and compression mechanism. The 3rd order Birch-Murnaghan equation of state (BM3) fit of all data gives V o = 423.9(3) Å3, K To = 116(2) GPa and K To’ = 4.3(2). These elastic parameters are consistent with the general trend of the diopside-jadeite join. The eight-coordinated polyhedra (M2 and M21) are the most compressible, and contribute to majority of the unit cell compression, while the SiO 4 tetrahedra (Si1 and Si2) behave as rigid structural units and are the most incompressible. Axial compressibilities are determined by fitting linearized BM 3 equation of state to pressure dependences of unit cell parameters. Throughout the investigated pressure range, the b-axis is more compressible than the c-axis. Here, the axial compressibility of the α-axis is the largest among the three axes at 0 GPa, yet it quickly drops to the smallest at pressures above 5 GPa, which ismore » explained by the rotation of the stiffest compression axis toward the a-axis with the increase of pressure.« less
Authors:
 [1] ;  [1] ;  [1]
  1. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Publication Date:
Grant/Contract Number:
NA0002006
Type:
Accepted Manuscript
Journal Name:
Physics and Chemistry of Minerals
Additional Journal Information:
Journal Volume: 43; Journal Issue: 10; Journal ID: ISSN 0342-1791
Publisher:
Springer
Research Org:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; pyroxene; high pressure; single-crystal; diffraction; synchrotron; mantle; subduction
OSTI Identifier:
1364640

Zhang, Dongzhou, Hu, Yi, and Dera, Przemyslaw K. Compressional behavior of omphacite to 47 GPa. United States: N. p., Web. doi:10.1007/s00269-016-0827-4.
Zhang, Dongzhou, Hu, Yi, & Dera, Przemyslaw K. Compressional behavior of omphacite to 47 GPa. United States. doi:10.1007/s00269-016-0827-4.
Zhang, Dongzhou, Hu, Yi, and Dera, Przemyslaw K. 2016. "Compressional behavior of omphacite to 47 GPa". United States. doi:10.1007/s00269-016-0827-4. https://www.osti.gov/servlets/purl/1364640.
@article{osti_1364640,
title = {Compressional behavior of omphacite to 47 GPa},
author = {Zhang, Dongzhou and Hu, Yi and Dera, Przemyslaw K.},
abstractNote = {Omphacite is an important mineral component of eclogite. Single crystal synchrotron X-ray diffraction data on natural (Ca,Na)(Mg,Fe,Al)Si2O6 omphacite have been collected at the Advanced Photon Source beamlines 13-BM-C and 13-ID-D up to 47 GPa at ambient temperature. Unit cell parameter and crystal structure refinements were carried out to constrain the isothermal equation of state and compression mechanism. The 3rd order Birch-Murnaghan equation of state (BM3) fit of all data gives Vo = 423.9(3) Å3, KTo = 116(2) GPa and KTo’ = 4.3(2). These elastic parameters are consistent with the general trend of the diopside-jadeite join. The eight-coordinated polyhedra (M2 and M21) are the most compressible, and contribute to majority of the unit cell compression, while the SiO4 tetrahedra (Si1 and Si2) behave as rigid structural units and are the most incompressible. Axial compressibilities are determined by fitting linearized BM3 equation of state to pressure dependences of unit cell parameters. Throughout the investigated pressure range, the b-axis is more compressible than the c-axis. Here, the axial compressibility of the α-axis is the largest among the three axes at 0 GPa, yet it quickly drops to the smallest at pressures above 5 GPa, which is explained by the rotation of the stiffest compression axis toward the a-axis with the increase of pressure.},
doi = {10.1007/s00269-016-0827-4},
journal = {Physics and Chemistry of Minerals},
number = 10,
volume = 43,
place = {United States},
year = {2016},
month = {7}
}

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