Г 15 Галашев, А. Е. Изучение разупорядочения ГПУ-кристалла аргона методом статистической геометрии [] = Investigation on the Disordering of Argon Hexagonal Closed Packed (HCP) Crystals by the Method of Statistical Geometry / А. Е. Галашев, В. П. Скрипов // Журнал структурной химии. - 1984. - Т. 25, N 5. - С. 77-83 . - ISSN 0136-7463 Рубрики: ФИЗИКА Кл.слова (ненормированные): ГПУ-КРИСТАЛЛЫ -- АРГОН -- Ar (АРГОН) -- РАЗУПОРЯДОЧЕНИЕ КРИСТАЛЛОВ -- ГЕОМЕТРИЯ СТАТИСТИЧЕСКАЯ -- СТАТИСТИЧЕСКАЯ ГЕОМЕТРИЯ -- КРИСТАЛЛОГРАФИЯ |
Г 15 Галашев, А. Е. Термодинамическая устойчивость ГПУ-кристалла в молекулярно-динамической модели аргона [] = Thermodynamic Stability of OF Hexagonal Closed Packed (HCP) Crystals in the Molecular-Dynamic Argon Model / А. Е. Галашев // Журнал структурной химии. - 1984. - Т. 25, N5. - С. 71-76 Рубрики: ФИЗИКА Кл.слова (ненормированные): ГПУ-КРИСТАЛЛЫ -- АРГОН -- Ar -- МОДЕЛЬ МОЛЕКУЛЯРНО-ДИНАМИЧЕСКАЯ -- УСТОЙЧИВОСТЬ ТЕРМОДИНАМИЧЕСКАЯ -- ТЕРМОДИНАМИЧЕСКАЯ УСТОЙЧИВОСТЬ -- УСТОЙЧИВОСТЬ КРИСТАЛЛОВ -- КРИСТАЛЛОВ УСТОЙЧИВОСТЬ |
G 15 Galashev, A. E. Thermodynamic stability of hexagonal closed packed (HCP) crystals in the molecular-dynamic argon model / A. E. Galashev // Journal of Structural Chemistry. - 1984. - Vol. 25, № 5. - С. 728-733 Рубрики: ФИЗИКА Кл.слова (ненормированные): HCP -- ARGON MODEL -- THERMODYNAMIC STABILITY \\\\Expert2\\NBO\\Journal of Structural Chemistry\\1984, V. 25, N 5, p.728.pdf |
G 15 Galashev, A. E. Investigation on the disordering of argon hexagonal closed packed (HCP) crystals by the method of statistical geometry / A. E. Galashev, V. P. Skripov // Journal of Structural Chemistry. - 1984. - Vol. 25, № 5. - С. 734-740 Рубрики: ФИЗИКА Кл.слова (ненормированные): ARGON -- STATISTICAL GEOMETRY -- HCP \\\\Expert2\\NBO\\Journal of Structural Chemistry\\1984, V. 25, N 5, p.734.pdf |
K 46 Kinetics of nucleation during the bcc-hcp structural transition in solid helium [Electronic resource] / A. P. Birchenko, Y. O. Vekhov, N. P. Mikhin, E. Y. Rudavskii, V. G. Baidakov // Low Temperature Physics . - 2013. - Vol.39, №6. - P487-492. - Bibliogr. : p. 492 (19 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): NUCLEATION -- SOLID HELIUM -- KINETICS Аннотация: The nucleation kinetics of the hcp phase in the supercooled bcc phase of solid 4He and a 3He-4He solution containing 1% 3He is studied experimentally. Precision measurements of the pressure in the crystal are made as it is cooled along an isochore near the bcc-hcp phase equilibrium curve. The lifetime of the metastable bcc phase in 4He is found to have a complicated dependence on the level of supercooling which can be described in terms of two nucleation mechanisms-homogeneous and heterogeneous. The homogeneous mechanism occurs for the highly supercooled bcc phase in carefully annealed crystals, while the heterogeneous mechanism, for which the activation coefficients are several orders of magnitude lower than for the homogeneous mechanism, occurs with low supercooling. The influence of defects and impurities on the nucleation process is also studied. In unannealed (defective) 4He crystals the nucleation rate is found to have an enormous scatter, which is indicative of poor reproducibility from one crystal to another. For annealed samples of 3He-4He solution the nucleation kinetics data can be described only by the heterogeneous nucleation mechanism. \\\\expert2\\NBO\\Low Temperature Physics\\2013, v.39, N 6, p.487-492.pdf |
K 46 Kinetics of nucleation under bcc-hcp structural transition in solid helium [Electronic resource] / A. P. Birchenko, Y. O. Vekhov, N. P. Mikhin, E. Y. Rudavskii, V. G. Baidakov // Fizika Nizkikh Temperatur. - 2013. - Vol.39, №6. - P627-634. - Bibliogr. : p. 634 (16 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): METASTABLE PHASES -- NUCLEATION -- PHASE TRANSITIONS BCC-HCP Аннотация: An experimental study of the kinetics of formation of nuclei hcp phase in supercooled bcc phase of solid 4He and 3He-4He solution containing 1% 3He is realised. The method precision measurement of pressure crystal cooled along isochore near the line of phase equilibrium bcc-hcp is used. It's found that in 4He lifetime metastable bcc phase has a complex depend Ence on the magnitude of hypothermia, which can be described with the involvement of two mechanisms of nucleation - homogeneous and heterogeneous. It is shown that at large overcooling bcc phase of carefully annealed crystals homogeneous nucleation mechanism realized, and at low overcooling a heterogeneous mechanism realized, which is characterized by the values of activation coefficients several orders of magnitude less homogeneous. The effect of defects and impurities on the nucleation process is investigated. Revealed that in the unannealed (defective) 4He crystal nucleation rate shows huge variation in the values, indicating poor reproducibility from crystal to crystal. It's found that for the annealed samples 3He-4He data obtained on the nucleation kinetics can be described only by heterogeneous nucleation mechanism |
V 76 Vitrification of liquid inclusions in hcp 3He-4He crystal: The role of an intermediate bcc phase [Electronic resource] / N. P. Mikhin, A. P. Birchenko, A. P. Neoneta, E. Y. Rudavskii, V. G. Baidakov // Journal of Low Temperature Physics. - 2014. - Vol.175, № 1-2. - 154-159. . - Bibliogr. : p. 159 (11 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): NMR -- RELAXATION TIMES -- SOLID HELIUM Аннотация: The phase structure of the rapidly quenched solid helium samples is studied by the NMR technique in dilute 3He-4He mixtures at 1.35-1.8 K. The pulse NMR method is used to measure the spin-lattice and spin-spin relaxation times for all coexisting phases. An additional spin-lattice relaxation process is found just before vitrification of the liquid inclusions in hcp matrix. The relaxation rate of the new process coincides with that of bcc solid. It has been found that the new relaxation process is observed only in the temperature region of the phase diagram where an equilibrium bcc phase exists. After the liquid inclusions vitrification has been completed, the contribution from the bcc phase is not detected. The spin-lattice relaxation times in all of coexisting phases are discussed \\\\expert2\\nbo\\Journal of Low Temperature Physics\\2014, v.175, p. 154-159.pdf |
Г 15 Галашев, А. Е. Изучение разупорядочения ГПУ-кристалла аргона методом статистической геометрии [] = Investigation on the Disordering of Argon Hexagonal Closed Packed (HCP) Crystals by the Method of Statistical Geometry / А. Е. Галашев, В. П. Скрипов // Журнал структурной химии. - 1984. - Т. 25, N 5. - С. 77-83 . - ISSN 0136-7463 Рубрики: ФИЗИКА Кл.слова (ненормированные): ГПУ-КРИСТАЛЛЫ -- АРГОН -- Ar (АРГОН) -- РАЗУПОРЯДОЧЕНИЕ КРИСТАЛЛОВ -- ГЕОМЕТРИЯ СТАТИСТИЧЕСКАЯ -- СТАТИСТИЧЕСКАЯ ГЕОМЕТРИЯ -- КРИСТАЛЛОГРАФИЯ |
Г 15 Галашев, А. Е. Термодинамическая устойчивость ГПУ-кристалла в молекулярно-динамической модели аргона [] = Thermodynamic Stability of OF Hexagonal Closed Packed (HCP) Crystals in the Molecular-Dynamic Argon Model / А. Е. Галашев // Журнал структурной химии. - 1984. - Т. 25, N5. - С. 71-76 Рубрики: ФИЗИКА Кл.слова (ненормированные): ГПУ-КРИСТАЛЛЫ -- АРГОН -- Ar -- МОДЕЛЬ МОЛЕКУЛЯРНО-ДИНАМИЧЕСКАЯ -- УСТОЙЧИВОСТЬ ТЕРМОДИНАМИЧЕСКАЯ -- ТЕРМОДИНАМИЧЕСКАЯ УСТОЙЧИВОСТЬ -- УСТОЙЧИВОСТЬ КРИСТАЛЛОВ -- КРИСТАЛЛОВ УСТОЙЧИВОСТЬ |
G 15 Galashev, A. E. Thermodynamic stability of hexagonal closed packed (HCP) crystals in the molecular-dynamic argon model / A. E. Galashev // Journal of Structural Chemistry. - 1984. - Vol. 25, № 5. - С. 728-733 Рубрики: ФИЗИКА Кл.слова (ненормированные): HCP -- ARGON MODEL -- THERMODYNAMIC STABILITY \\\\Expert2\\NBO\\Journal of Structural Chemistry\\1984, V. 25, N 5, p.728.pdf |
G 15 Galashev, A. E. Investigation on the disordering of argon hexagonal closed packed (HCP) crystals by the method of statistical geometry / A. E. Galashev, V. P. Skripov // Journal of Structural Chemistry. - 1984. - Vol. 25, № 5. - С. 734-740 Рубрики: ФИЗИКА Кл.слова (ненормированные): ARGON -- STATISTICAL GEOMETRY -- HCP \\\\Expert2\\NBO\\Journal of Structural Chemistry\\1984, V. 25, N 5, p.734.pdf |
K 46 Kinetics of nucleation during the bcc-hcp structural transition in solid helium [Electronic resource] / A. P. Birchenko, Y. O. Vekhov, N. P. Mikhin, E. Y. Rudavskii, V. G. Baidakov // Low Temperature Physics . - 2013. - Vol.39, №6. - P487-492. - Bibliogr. : p. 492 (19 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): NUCLEATION -- SOLID HELIUM -- KINETICS Аннотация: The nucleation kinetics of the hcp phase in the supercooled bcc phase of solid 4He and a 3He-4He solution containing 1% 3He is studied experimentally. Precision measurements of the pressure in the crystal are made as it is cooled along an isochore near the bcc-hcp phase equilibrium curve. The lifetime of the metastable bcc phase in 4He is found to have a complicated dependence on the level of supercooling which can be described in terms of two nucleation mechanisms-homogeneous and heterogeneous. The homogeneous mechanism occurs for the highly supercooled bcc phase in carefully annealed crystals, while the heterogeneous mechanism, for which the activation coefficients are several orders of magnitude lower than for the homogeneous mechanism, occurs with low supercooling. The influence of defects and impurities on the nucleation process is also studied. In unannealed (defective) 4He crystals the nucleation rate is found to have an enormous scatter, which is indicative of poor reproducibility from one crystal to another. For annealed samples of 3He-4He solution the nucleation kinetics data can be described only by the heterogeneous nucleation mechanism. \\\\expert2\\NBO\\Low Temperature Physics\\2013, v.39, N 6, p.487-492.pdf |
K 46 Kinetics of nucleation under bcc-hcp structural transition in solid helium [Electronic resource] / A. P. Birchenko, Y. O. Vekhov, N. P. Mikhin, E. Y. Rudavskii, V. G. Baidakov // Fizika Nizkikh Temperatur. - 2013. - Vol.39, №6. - P627-634. - Bibliogr. : p. 634 (16 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): METASTABLE PHASES -- NUCLEATION -- PHASE TRANSITIONS BCC-HCP Аннотация: An experimental study of the kinetics of formation of nuclei hcp phase in supercooled bcc phase of solid 4He and 3He-4He solution containing 1% 3He is realised. The method precision measurement of pressure crystal cooled along isochore near the line of phase equilibrium bcc-hcp is used. It's found that in 4He lifetime metastable bcc phase has a complex depend Ence on the magnitude of hypothermia, which can be described with the involvement of two mechanisms of nucleation - homogeneous and heterogeneous. It is shown that at large overcooling bcc phase of carefully annealed crystals homogeneous nucleation mechanism realized, and at low overcooling a heterogeneous mechanism realized, which is characterized by the values of activation coefficients several orders of magnitude less homogeneous. The effect of defects and impurities on the nucleation process is investigated. Revealed that in the unannealed (defective) 4He crystal nucleation rate shows huge variation in the values, indicating poor reproducibility from crystal to crystal. It's found that for the annealed samples 3He-4He data obtained on the nucleation kinetics can be described only by heterogeneous nucleation mechanism |
V 76 Vitrification of liquid inclusions in hcp 3He-4He crystal: The role of an intermediate bcc phase [Electronic resource] / N. P. Mikhin, A. P. Birchenko, A. P. Neoneta, E. Y. Rudavskii, V. G. Baidakov // Journal of Low Temperature Physics. - 2014. - Vol.175, № 1-2. - 154-159. . - Bibliogr. : p. 159 (11 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): NMR -- RELAXATION TIMES -- SOLID HELIUM Аннотация: The phase structure of the rapidly quenched solid helium samples is studied by the NMR technique in dilute 3He-4He mixtures at 1.35-1.8 K. The pulse NMR method is used to measure the spin-lattice and spin-spin relaxation times for all coexisting phases. An additional spin-lattice relaxation process is found just before vitrification of the liquid inclusions in hcp matrix. The relaxation rate of the new process coincides with that of bcc solid. It has been found that the new relaxation process is observed only in the temperature region of the phase diagram where an equilibrium bcc phase exists. After the liquid inclusions vitrification has been completed, the contribution from the bcc phase is not detected. The spin-lattice relaxation times in all of coexisting phases are discussed \\\\expert2\\nbo\\Journal of Low Temperature Physics\\2014, v.175, p. 154-159.pdf |