To study the mechanical behavior of polymineralic rocks, we performed deformation experiments on two-phase aggregates olivine (Ol) + ferropericlase (Per) with periclase fractions (fPer) between 0.1 and 0.8. Each sample was deformed in torsion at T = 1523 K, P 300 MPa a constant strain rate to final shear ? 6 7. The stress-strain data calculated values stress exponent, n, indicate that Ol our sa...

Here it is shown that the crystal radii of ions are represented by a simple relation rcryst = rB3?(10 m)/N, where m and N small integer numbers determined principal orbital quantum valence, rB Bohr radius. The holds to within 5%. This finding elucidates despite their original definition crystal- ionic not classical but represent limiting case spherically symmetric spatial averages valence elect...

The response of forsterite, Mg2SiO4, under dynamic compression is fundamental importance for understanding its phase transformations and high-pressure behavior. Here, we have carried out an in situ X-ray diffraction study laser-shocked polycrystalline single-crystal forsterite (a-, b-, c-orientations) from 19 to 122 GPa using the Matter Extreme Conditions end-station Linac Coherent Light Source...

Background. This paper presents a comparative study into diamonds from kimberlite bodies of the Verkhnemunsky field (Zapolyarnaya, Novinka, Komsomolskaya-Magnitnaya and Poiskovaya), results which allow these minerals to be distinguished those found in other fields Siberian platform. Diamonds Zapolyarnaya pipe are characterized by an increased prevalence dodecahedroids with shagreen plastic defo...

The importance of carbon in Earth's mantle greatly exceeds its modest abundance of approximately 1,000-4,000 ppm. Carbon is a constituent of key terrestrial volatiles (CO, CO(2), CH(4)), it forms diamonds, and it may also contribute to the bulk electrical properties of the silicate Earth. In contrast to that of the mantle, the carbon content of Earth's metallic core may be quite high ( approxim...

Certification of the phase compositions of the three NIST Reference Clinkers will be based upon more than one independent method. The current reference values were established using an optical microscope examination, with additional optical microscope data taken from an ASTM C 1356 round robin. The present X-ray powder diffraction (XRD) study provides a second, independent estimate of the phase...

General lattice vibrational properties of minerals, particularly those properties which strongly influence the thermodynamic behavior, are discussed in this paper (the second of a series relating thermodynamic and lattice vibrational properties of minerals). Infrared (IR), Raman (R), and inelastic neutron scattering (INS) data are summarized, if known, for the following minerals: halite (INS), ...

Certification of the phase compositions of the three NIST Reference Clinkers will be based upon more than one independent method. The current reference values were established using an optical microscope examination, with additional optical microscope data taken from an ASTM C 1356 round robin. The present X-ray powder diffraction (XRD) study provides the second, independent estimate of the pha...