Zobrazeno 1 - 10
of 14
pro vyhledávání: '"V. S. Efimchenko"'
Autor:
V. S. Efimchenko, V. K. Fedotov, Artem V. Prokoshin, Nicolay V. Barkovskii, Konstantin P. Meletov
Publikováno v:
American Mineralogist. 106:1097-1104
Hydrogen-induced decomposition of fayalite (Fe2SiO4) at high pressure is of considerable interest for a better understanding of the chemical processes occurring in the cores and mantles of icy satellites. At pressures up to 10 GPa and temperatures 25
Autor:
Nicolay V. Barkovskii, Vladimir M. Chernyak, V. S. Efimchenko, Kirill I. Khryapin, Konstantin P. Meletov, V. K. Fedotov
Publikováno v:
Physics and Chemistry of Minerals. 46:743-749
Thermal stability of fayalite (Fe2SiO4) is studied at hydrogen pressures up to 7.5 GPa and temperatures up to 400 °C. Powder samples of Fe2SiO4 were exposed to a hydrogen or deuterium atmosphere for 24 h in the Toroid-type apparatus at pre-selected
Autor:
Kirill I. Khryapin, Nikolay V. Barkovskii, Konstantin P. Meletov, Sergey V. Simonov, Salavat S. Khasanov, V. S. Efimchenko, V. K. Fedotov
Publikováno v:
Journal of Alloys and Compounds. 770:229-235
New amorphous solutions MgySiO2+y-XH2 with the magnesium concentration varying from y = 0 to y = 0.88 were synthesized at a hydrogen pressure of 75 kbar and a temperature of 250 °C, followed by quenching to the temperature of liquid nitrogen. The qu
Autor:
Boris M. Bulychev, K. P. Meletov, D. I. Kapustin, D. V. Matveev, V. B. Son, V. S. Efimchenko, O. I. Barkalov, I. A. Sholin, V. I. Kulakov
Publikováno v:
Russian Journal of Inorganic Chemistry. 63:364-368
Samples of the clathrate Na x Si136 were saturated with hydrogen to 100 atm at 25°C in a Sievertstype apparatus and at pressures of 6 and 28 kbar in lentil-type high-pressure apparatuses at 100 and 250°C. X-ray powder diffraction analysis and Raman
Publikováno v:
Journal of Experimental and Theoretical Physics. 124:914-919
The solubility of hydrogen in amorphous Mg0.6SiO2.6 at a temperature of 250°C and pressures up to 75 kbar is studied using a quenching technique. The molar ratio H2/formula unit is found to nonlinearly increase with pressure from x = 0.12 at P = 10
Autor:
Semen N. Klyamkin, Garrett E. Granroth, A. V. Levchenko, Alexander I. Kolesnikov, M. K. Sakharov, V. S. Efimchenko, V.E. Antonov, Yang Ren
Publikováno v:
Journal of Alloys and Compounds. 509:S599-S603
Inelastic neutron scattering spectra of α-MgH 2 powder have been measured at T = 7 K with an energy resolution better than 1.5% using the time-of-flight direct geometry spectrometer SEQUOIA. Based on these spectra, the density g ( E ) of phonon stat
Autor:
M. K. Sakharov, Sergey V. Simonov, Mikhail A. Kuzovnikov, Marek Tkacz, V. S. Efimchenko, V. K. Fedotov
Publikováno v:
Journal of Alloys and Compounds. 509:S860-S863
A new hydrogen hydrate denoted C 0 is discovered in the H 2 O–H 2 system at −20 °C and hydrogen pressures near 5 kbar. Powder samples of the hydrate were quenched under high pressure to the liquid N 2 temperature and recovered to ambient pressur
Publikováno v:
High Pressure Research. 29:250-253
Using a volumetric technique, phase transitions in the H2O–H2 system were investigated in the vicinity of two points of an invariant equilibrium, L+I h+sII and L+sII+C 1, located at 1.07 kbar and−10 °C and at 3.6 kbar and 1 °C, respectively. Li
Publikováno v:
The Journal of Physical Chemistry B. 113:779-785
Using a volumetric technique, a T-P diagram of phase transformations between the hydrogen-rich clathrate hydrate (sII phase), hydrogen-filled ice II (C(1) phase), and the liquid (L) is studied in the H(2)O-H(2) system at pressures up to 4.7 kbar and
Publikováno v:
The Journal of Physical Chemistry B. 112:7026-7031
Using a volumetric technique, the deuterium solubility, X, in heavy water (L), low-pressure hexagonal ice (I h), and high-pressure cubic clathrate ice (sII) is studied at deuterium pressures up to 1.8 kbar and temperatures from -40 to +5 degrees C. T