No abstract

The electric resistance of shock-compressed scandium has been studied up to pressures of 90 GPa. The low-pressure phase of scandium Sc-I undergoes polymorphic transformation in the high-pressure incommensurate phase Sc-II at a shock pressure of Ϸ16.5 GPa and a calculated shock temperature of Ϸ510 K. The equation of state of the incommensurate phase Sc-II is constructed.

A mixture of Mg and MgO has been subjected to a shock-wave pressure of ≃ 170 kbar. The ac susceptibility measurements of the product has revealed a metastable superconductivity with Tc ≈ 30 K, characterized by glassy dynamics of the shielding currents below Tc. Comparison of the ac susceptibility and the dc magnetization measurements infers that the superconductivity arises within the interfacial layer formed between metallic Mg and its oxide due to the shock-wave treatment.

No abstract

The experimental multiple-shock technique and a computer-code simulation were used for investigations of electrophysical properties of dense molten sodium up to pressures of 230(5) GPa and temperatures up to 8000(600) K. The multiple-shock data show that the resistivity of shocked sodium increases with pressure and temperature up to 270(30) μ cm. This change was interpreted via the pressure-induced metal-semiconductor transition in shocked molten sodium.