Pressure dependence of u parameter in ringwoodite up to 7.9 GPa

High pressure structural studies on Nb5Si3 up to 26.2 GPa

Pressure dependence of the superconducting critical temperature of HgBa2Ca2Cu3O8+y and HgBa2Ca3Cu4O10+y up to 30 GPa.

By performing experiments on samples as pure as presently available, the origin of the reported pressureinduced Tc values well above 150 K in the mercury-based high-Tc superconductors has been investigated. For HgBa2Ca2Cu3O81y ~Hg-1223! maximum Tc values between 142 K and 146 K are obtained under pressure up to 30 GPa, while for HgBa2Ca3Cu4O101y ~Hg-1234! Tc never exceeds 121 K. To verify the r...

Sound velocities of hydrous ringwoodite to 16 GPa and 673 K

a Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, USA b Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, USA c Department of Geosciences, Princeton University, Princeton, NJ 08544, USA d Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA e Bayerisches Geo...

Pressure and strain dependence of the strength of sintered polycrystalline Mg2SiO4 ringwoodite

[1] Differential stresses in a cylindrical rock of polycrystalline Mg2SiO4 ringwoodite were measured at room temperature with pressures up to 10 GPa, axial strains in excess of 20%, and strain rates between 5 10 5 and 4 10 6 s , using the deformation-DIA coupled with monochromatic X-rays. The sample exhibited ductile behavior in axial shortening-lengthening cycles with reproducible hysteresis l...

Aggregate sound velocities and acoustic Grüneisen parameter of iron up to 300 GPa and 1,200 K.

Successful interpretation of available geophysical data requires experimental and theoretical information on the elasticity of solids under physical conditions of Earth's interior. Because iron is considered as major component in Earth's core, elastic properties of iron at high pressures and temperatures are very important for modeling its composition and dynamics. We use in situ x-ray diffract...