Impedance spectroscopy of synthetic proustite at high pressures

Adsorption at High Pressures

The compositional variation of synthetic sodic amphiboles at high and ultra-high pressures

Sodic amphiboles in high pressure and ultrahigh pressure (UHP) metamorphic rocks are complex solid solutions in the system Na2O±MgO±Al2O3±SiO2± H2O (NMASH) whose compositions vary with pressure and temperature. We conducted piston-cylinder experiments at 20±30 kbar and 700±800 °C to investigate the stability and compositional variations of sodic amphiboles, based on the reaction glaucophane ˆ 2...

Plasma interferometry at high pressures

A general formulation for the measurement of plasma density and effective collision frequency for lowly as well as highly, collisional plasmas using millimeter wave interferometry is presented. In the presence of high density and collisionality at high gas pressures where the collision frequency ~n! is of the order of both the plasma (vp) and the wave frequency of the millimeter wave ~v! (n ;v ...

Performance of Cubic Eos at High Pressures

Cet article prŽsente une Žvaluation des performances des Žquations d'Žtats (EoS) cubiques pour la prŽvision des comportements de phases des mŽlanges hyperbares. Il met en Žvidence un certain nombre de problmes auxquels il devrait tre rŽpondu d'une manire coopŽrative. Les points relatifs ˆ la dŽfinition des paramtres des EoS, tels que les coefficients d'interaction, les propriŽtŽs critiques ...

Synthesis of sodium polyhydrides at high pressures

The only known compound of sodium and hydrogen is archetypal ionic NaH. Application of high pressure is known to promote states with higher atomic coordination, but extensive searches for polyhydrides with unusual stoichiometry have had only limited success in spite of several theoretical predictions. Here we report the first observation of the formation of polyhydrides of Na (NaH3 and NaH7) ab...