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Title: Compressional behavior of omphacite to 47 GPa

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1274746
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics and Chemistry of Minerals; Journal Volume: 2016; Journal Issue: 2016
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Zhang, Dongzhou, Hu, Yi, and Dera, Przemyslaw K. Compressional behavior of omphacite to 47 GPa. United States: N. p., 2016. 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. Fri . "Compressional behavior of omphacite to 47 GPa". United States. doi:10.1007/s00269-016-0827-4.
@article{osti_1274746,
title = {Compressional behavior of omphacite to 47 GPa},
author = {Zhang, Dongzhou and Hu, Yi and Dera, Przemyslaw K.},
abstractNote = {},
doi = {10.1007/s00269-016-0827-4},
journal = {Physics and Chemistry of Minerals},
number = 2016,
volume = 2016,
place = {United States},
year = {Fri Jul 08 00:00:00 EDT 2016},
month = {Fri Jul 08 00:00:00 EDT 2016}
}
  • 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.more » 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 is explained by the rotation of the stiffest compression axis toward the a-axis with the increase of pressure.« less
  • Compressional and shear-wave velocities and unit-cell volumes of orthorhombic CaGeO{sub 3} perovskite have been measured up to 10GPa at ambient temperature using ultrasonic interferometry in conjunction with synchrotron x radiation. Fitting all velocity and unit-cell volume data to finite-strain equations yields the zero-pressure adiabatic bulk and shear moduli and their pressure derivatives K{sub S0}=194.6 (11)GPa, G{sub 0}=109.5 (5)GPa , KS0'=6.4 (2), G0'=1.7 (1), with an rms misfit of 0.009kms{sup -1} . From the data in the current study, we have observed no discontinuities or elasticity softening for either the bulk or shear moduli up to the peak pressure of 10GPamore » .« less
  • Compressional and shear-wave velocities and unit-cell volumes of orthorhombic CaGeO{sub 3} perovskite have been measured up to 10 GPa at ambient temperature using ultrasonic interferometry in conjunction with synchrotron x radiation. Fitting all velocity and unit-cell volume data to finite-strain equations yields the zero-pressure adiabatic bulk and shear moduli and their pressure derivatives K{sub S0}=194.6 (11) GPa, G{sub 0}=109.5 (5) GPa, K{sub S0}{sup '}=6.4 (2), G{sub 0}{sup '}=1.7 (1), with an rms misfit of 0.009 km s{sup -1}. From the data in the current study, we have observed no discontinuities or elasticity softening for either the bulk or shear modulimore » up to the peak pressure of 10 GPa.« less
  • Cylindrical (extended) charges are used extensively in blasting. The requirement of reliable quantitative evaluation of parameters for the compressional wave occurring during explosion of cylindrical charges is explored. A study is described of wave motion during explosion of a cylindrical charge of PETP in Plexiglas which is an example of a solid medium differing markedly from actual rock. Both components of mass velocity were measured using an electromagnetic procedure and the scheme for carrying out tests is shown. Measurements of compressional wave parameters for radial particle velocity and longitudinal particle velocity with explosion of charges as indicated are given here.more » It is demonstrated that with supersonic detonation in Plexiglas the maximum particle velocity vector is perpendicular to the conical wave front and in the case of c/D is greater than 0.71 the longitudinal component of the maximum particle velocity becomes greater than the radial component. A qualitative explanation is given for certain features of the material movement ahead of the front and damping of the maximum particle velocity with distance during supersonic detonation of a cylindrical charge.« less