TY - JOUR
T1 - Elasticity and rheology of platinum under high pressure and nonhydrostatic stress
AU - Kavner, Abby
AU - Duffy, Thomas S.
PY - 2003
Y1 - 2003
N2 - Using radial x-ray diffraction under nonhydrostatic compression in a diamond-anvil cell, we determine a lower bound of the yield strength of polycrystalline platinum to be 2.2 to 3.3 GPa in the pressure range of 4.2 to 22.4 GPa at room temperature. The elastic anisotropy S=2(S11-S12)/S44 of platinum is also evaluated, and is equal to 1.47(16) throughout this pressure range. In addition, platinum shows a time-dependent relaxation under nonhydrostatic stress at both ambient temperatures and, in a separate set of experiments, during laser heating. Average strain rates measured for platinum are 10-7 s-1 at 300 K and 10-5 s-1 at 1200 K, resulting in effective creep viscosities of 1015 Pa s at 300 K and 1013 Pa s at 1200(300) K.
AB - Using radial x-ray diffraction under nonhydrostatic compression in a diamond-anvil cell, we determine a lower bound of the yield strength of polycrystalline platinum to be 2.2 to 3.3 GPa in the pressure range of 4.2 to 22.4 GPa at room temperature. The elastic anisotropy S=2(S11-S12)/S44 of platinum is also evaluated, and is equal to 1.47(16) throughout this pressure range. In addition, platinum shows a time-dependent relaxation under nonhydrostatic stress at both ambient temperatures and, in a separate set of experiments, during laser heating. Average strain rates measured for platinum are 10-7 s-1 at 300 K and 10-5 s-1 at 1200 K, resulting in effective creep viscosities of 1015 Pa s at 300 K and 1013 Pa s at 1200(300) K.
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U2 - 10.1103/PhysRevB.68.144101
DO - 10.1103/PhysRevB.68.144101
M3 - Article
AN - SCOPUS:5544324041
SN - 1098-0121
VL - 68
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 14
ER -