Osmium metal studied under high pressure and nonhydrostatic stress.

@article{Weinberger2008OsmiumMS,
  title={Osmium metal studied under high pressure and nonhydrostatic stress.},
  author={Michelle B. Weinberger and Sarah H. Tolbert and Abby Kavner},
  journal={Physical review letters},
  year={2008},
  volume={100 4},
  pages={
          045506
        }
}
Interest in osmium as an ultra-incompressible material and as an analog for the behavior of iron at high pressure has inspired recent studies of its mechanical properties. We have measured elastic and plastic deformation of Os metal at high pressures using in situ high pressure x-ray diffraction in the radial geometry. We show that Os has the highest yield strength observed for any pure metal, supporting up to 10 GPa at a pressure of 26 GPa. Furthermore, our data indicate changes in the… Expand
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Incompressibility of osmium metal at ultrahigh pressures and temperatures
Osmium is one of the most incompressible elemental metals, and is used as a matrix material for synthesis of ultrahard materials. To examine the behavior of osmium metal under extreme conditions of… Expand
High-pressure behavior of osmium: An analog for iron in Earth’s core
High-resolution x-ray diffraction with diamond-anvil cells, using argon as a quasi-hydrostatic pressure medium, documents the crystal structure and equation of state of osmium to over 60 GPa at room… Expand
The most incompressible metal osmium at static pressures above 750 gigapascals
TLDR
Powder X-ray diffraction measurements onallic osmium are reported at multi-megabar pressures using both conventional and double-stage diamond anvil cells, with accurate pressure determination ensured by first obtaining self-consistent equations of state of gold, platinum, and tungsten in static experiments up to 500 gigapascals. Expand
Lattice strain of osmium diboride under high pressure and nonhydrostatic stress
The lattice strain behavior of osmium diboride—a member of a group of third-row transition metal borides associated with hard/superhard behavior—has been studied using radial diffraction in a diamond… Expand
Estimating the Compressibility of Osmium from Recent Measurements of Ir-Os Alloys under High Pressure.
TLDR
It was concluded that the bulk modulus for osmium is slightly smaller than that for diamond, and a similar conclusion is obtained upon employing an alternative model, thus strengthening the conclusion that osmia is the densest but not the most incompressible element. Expand
Elastic and thermal properties of osmium under pressure
In this study, first-principles calculations of the crystal structure and the elastic properties of osmium have been carried out using the plane-wave pseudopotential density functional theory method.… Expand
High-pressure radial X-ray diffraction study of osmium to 58 GPa
AbstractNonhydrostatic compression behavior of osmium (Os) was investigated up to 58.2 GPa using radial X-ray diffraction (RXRD) together with lattice strain theory in a diamond-anvil cell. The… Expand
High-pressure structural study of solid mercury up to 200 GPa
High-pressure powder x-ray diffraction experiments have been carried out on solid mercury up to 196 GPa at room temperature. The hexagonal-close-packed δ phase, which exists above 36 GPa, is found to… Expand
Advancements in the Search for Superhard Ultra‐Incompressible Metal Borides
Dense transition metal borides have recently been identified as superhard materials that offer the possibility of ambient pressure synthesis compared to the conventional high pressure, high… Expand
Effects of deviatoric stresses in the diamond-anvil pressure cell on single-crystal samples
The nonhydrostatic stress states that are developed in the pressure media within diamond-anvil pressure cells have been investigated by single-crystal X-ray diffraction. Measurements of unit-cell… Expand
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