Y. Zouev - Academia.edu (original) (raw)

Papers by Y. Zouev

Research paper thumbnail of The interaction of deuterium and tritium with radiation and other defects in austenitic steel and nickel

Journal of Nuclear Materials, 2000

The methods of residual resistivity, annihilation of positrons, and nuclear reactions in nickel a... more The methods of residual resistivity, annihilation of positrons, and nuclear reactions in nickel and austenitic steels were used to examine the interaction of deuterium and tritium with defects produced by electron- neutron- or ion-irradiation and plastic deformation. It was found that vacancies, dislocations and three-dimensional vacancy clusters captured hydrogen in nickel. Vacancy clusters were formed in the presence of deuterium

Research paper thumbnail of 69Ga NMR and magnetic susceptibility in δ-phase of Pu1−xGax (x=0.05, x=0.08) alloys

Journal of Nuclear Materials, 2009

a b s t r a c t 69 Ga nuclear magnetic resonance spectra, line shifts ( 69 K) and nuclear spin-la... more a b s t r a c t 69 Ga nuclear magnetic resonance spectra, line shifts ( 69 K) and nuclear spin-lattice relaxation rate 69 T À1 1 have been measured in the 20 years aged Pu 0.95 Ga 0.05 and in fresh prepared Pu 0.92 Ga 0.08 alloys, stabilized d-phase, at magnetic field of 9.4 T in the temperature range (10-500) K. The line shift and 69 T À1 1 are determined correspondingly by the static and fluctuating-in-time parts of the local magnetic field that originates in transferred hyperfine coupling the Ga nuclear spin with the nearest f-electron environment of more magnetic Pu.

Research paper thumbnail of Magnetic state of f electrons in δ-phase of Pu–Ga alloys studied by Ga NMR

Journal of Alloys and Compounds, 2007

69Ga nuclear magnetic resonance (NMR) line shift (69K) and nuclear spin–lattice relaxation rate (... more 69Ga nuclear magnetic resonance (NMR) line shift (69K) and nuclear spin–lattice relaxation rate (69T1−1) are measured for Pu0.95Ga0.05 alloy, stabilized in δ-phase, in the temperature range 10 and 650K at magnetic field of 9.4T. The shift and 69T1−1 are determined correspondingly by the static and fluctuating-in-time parts of the local magnetic fields arisen at Ga due to transferred hyperfine coupling

Research paper thumbnail of The effect of tritium and neutron irradiation on the structure and properties of reactor steels and alloys

Fusion Engineering and Design, 2004

Studies performed under ISTC Project No. 019-94 provided a database on the effect of heavy hydrog... more Studies performed under ISTC Project No. 019-94 provided a database on the effect of heavy hydrogen isotopes (concentration up to 0.03 at.%), radiogenic helium and neutron irradiation predominantly on the mechanical properties of FCC 16Cr15Ni3Mo1Ti radiation-resistant reactor steel, which is produced in Russia. It was shown that loading of the steel with tritium and deuterium up to 0.03 at.% and subsequent neutron irradiation at 77 or 320 K with fluence of 10 19 -10 20 n/cm 2 led to an abrupt increase in strength characteristics, while a high plasticity (specific elongation δ = 30-40%) was preserved even at extremely low temperatures. The microautoradiographic examination showed that strengthening was due to blocking of dislocations by tritium atmospheres, formed at dislocation cores. Comparative studies were performed on BCC alloys (Fe-13Cr, V-4Ti-4Cr, and V-10Ti-5Cr). Exposure to the tritium effect and low-temperature neutron irradiation was shown to lead to an almost complete degradation of their plasticity characteristics at 77 K. .ru (V.V. Sagaradze). the form of interface ␣/␥ boundaries, are highly resistant to vacancy swelling when given high doses of radiation in the temperature interval 773-923 K [1,2]. The FCC and BCC alloys behave differently as ragards low-temperature embrittlement. It was this difference that promoted us to undertake a study into their plasticity after exposure to additional embrittlement factors, such as tritium impregnation and low-temperature neutron irradiation . For purposes of comparison, the study also included an analysis of changes in the plasticity of BCC vanadium alloys.

Research paper thumbnail of The influence of low-temperature neutron irradiation on physicomechanical properties of new reactor alloys saturated with tritium

Fusion Engineering and Design, 1998

ABSTRACT

Research paper thumbnail of Spin susceptibility of Ga-stabilized δ-Pu probed by Ga69 NMR

Physical Review B, 2005

Spin susceptibility of stabilized \delta phase in the Pu-Ga alloy is studied by measuring {69,71}... more Spin susceptibility of stabilized \delta phase in the Pu-Ga alloy is studied by measuring {69,71}^Ga NMR spectra and nuclear spin-lattice relaxation rate {69}T_{1}^{-1} in the temperature range 5 - 350 K. The shift ({69}^K) of the {69,71}^Ga NMR line and {69}^T_{1}^{-1} are controlled correspondingly by the static and the fluctuating in time parts of local magnetic field arisen at nonmagnetic gallium due to transferred hyperfine coupling with the nearest f electron environment of the more magnetic Pu. The nonmonotonic with a maximum around 150 K behavior of {69}^K(T) \chi_{s,5f}(T) is attributed to the peculiarities in temperature dependence of the f electron spin susceptibility \chi_{s,5f}(T) in \delta phase of plutonium. The temperature reversibility being observed in {69}^K(T) data provides strong evidence for an electronic instability developed with T in f electron bands near the Fermi energy and accompanied with a pseudogap-like decrease of \chi_{s,5f}(T) at T<150 K. The NMR data at high temperature are in favor of the mainly localized character of 5f electrons in \delta phase of the alloy with characteristic spin-fluctuation energy \Gamma(T) T^{0.35(5)}, which is close to $\Gamma(T) T^{0.5} predicted by Cox et al. [J. Appl. Phys. 57, 3166 (1985)] for 3D Kondo-system above T_Kondo}. The dynamic spin correlations of 5f electrons become essential to consider for {69}^T_{1}^{-1}(T) only at T<100 K. However, no NMR evidences favoring formation of the static magnetic order in \delta-Pu were revealed down to 5K .

Research paper thumbnail of The interaction of deuterium and tritium with radiation and other defects in austenitic steel and nickel

Journal of Nuclear Materials, 2000

The methods of residual resistivity, annihilation of positrons, and nuclear reactions in nickel a... more The methods of residual resistivity, annihilation of positrons, and nuclear reactions in nickel and austenitic steels were used to examine the interaction of deuterium and tritium with defects produced by electron- neutron- or ion-irradiation and plastic deformation. It was found that vacancies, dislocations and three-dimensional vacancy clusters captured hydrogen in nickel. Vacancy clusters were formed in the presence of deuterium

Research paper thumbnail of 69Ga NMR and magnetic susceptibility in δ-phase of Pu1−xGax (x=0.05, x=0.08) alloys

Journal of Nuclear Materials, 2009

a b s t r a c t 69 Ga nuclear magnetic resonance spectra, line shifts ( 69 K) and nuclear spin-la... more a b s t r a c t 69 Ga nuclear magnetic resonance spectra, line shifts ( 69 K) and nuclear spin-lattice relaxation rate 69 T À1 1 have been measured in the 20 years aged Pu 0.95 Ga 0.05 and in fresh prepared Pu 0.92 Ga 0.08 alloys, stabilized d-phase, at magnetic field of 9.4 T in the temperature range (10-500) K. The line shift and 69 T À1 1 are determined correspondingly by the static and fluctuating-in-time parts of the local magnetic field that originates in transferred hyperfine coupling the Ga nuclear spin with the nearest f-electron environment of more magnetic Pu.

Research paper thumbnail of Magnetic state of f electrons in δ-phase of Pu–Ga alloys studied by Ga NMR

Journal of Alloys and Compounds, 2007

69Ga nuclear magnetic resonance (NMR) line shift (69K) and nuclear spin–lattice relaxation rate (... more 69Ga nuclear magnetic resonance (NMR) line shift (69K) and nuclear spin–lattice relaxation rate (69T1−1) are measured for Pu0.95Ga0.05 alloy, stabilized in δ-phase, in the temperature range 10 and 650K at magnetic field of 9.4T. The shift and 69T1−1 are determined correspondingly by the static and fluctuating-in-time parts of the local magnetic fields arisen at Ga due to transferred hyperfine coupling

Research paper thumbnail of The effect of tritium and neutron irradiation on the structure and properties of reactor steels and alloys

Fusion Engineering and Design, 2004

Studies performed under ISTC Project No. 019-94 provided a database on the effect of heavy hydrog... more Studies performed under ISTC Project No. 019-94 provided a database on the effect of heavy hydrogen isotopes (concentration up to 0.03 at.%), radiogenic helium and neutron irradiation predominantly on the mechanical properties of FCC 16Cr15Ni3Mo1Ti radiation-resistant reactor steel, which is produced in Russia. It was shown that loading of the steel with tritium and deuterium up to 0.03 at.% and subsequent neutron irradiation at 77 or 320 K with fluence of 10 19 -10 20 n/cm 2 led to an abrupt increase in strength characteristics, while a high plasticity (specific elongation δ = 30-40%) was preserved even at extremely low temperatures. The microautoradiographic examination showed that strengthening was due to blocking of dislocations by tritium atmospheres, formed at dislocation cores. Comparative studies were performed on BCC alloys (Fe-13Cr, V-4Ti-4Cr, and V-10Ti-5Cr). Exposure to the tritium effect and low-temperature neutron irradiation was shown to lead to an almost complete degradation of their plasticity characteristics at 77 K. .ru (V.V. Sagaradze). the form of interface ␣/␥ boundaries, are highly resistant to vacancy swelling when given high doses of radiation in the temperature interval 773-923 K [1,2]. The FCC and BCC alloys behave differently as ragards low-temperature embrittlement. It was this difference that promoted us to undertake a study into their plasticity after exposure to additional embrittlement factors, such as tritium impregnation and low-temperature neutron irradiation . For purposes of comparison, the study also included an analysis of changes in the plasticity of BCC vanadium alloys.

Research paper thumbnail of The influence of low-temperature neutron irradiation on physicomechanical properties of new reactor alloys saturated with tritium

Fusion Engineering and Design, 1998

ABSTRACT

Research paper thumbnail of Spin susceptibility of Ga-stabilized δ-Pu probed by Ga69 NMR

Physical Review B, 2005

Spin susceptibility of stabilized \delta phase in the Pu-Ga alloy is studied by measuring {69,71}... more Spin susceptibility of stabilized \delta phase in the Pu-Ga alloy is studied by measuring {69,71}^Ga NMR spectra and nuclear spin-lattice relaxation rate {69}T_{1}^{-1} in the temperature range 5 - 350 K. The shift ({69}^K) of the {69,71}^Ga NMR line and {69}^T_{1}^{-1} are controlled correspondingly by the static and the fluctuating in time parts of local magnetic field arisen at nonmagnetic gallium due to transferred hyperfine coupling with the nearest f electron environment of the more magnetic Pu. The nonmonotonic with a maximum around 150 K behavior of {69}^K(T) \chi_{s,5f}(T) is attributed to the peculiarities in temperature dependence of the f electron spin susceptibility \chi_{s,5f}(T) in \delta phase of plutonium. The temperature reversibility being observed in {69}^K(T) data provides strong evidence for an electronic instability developed with T in f electron bands near the Fermi energy and accompanied with a pseudogap-like decrease of \chi_{s,5f}(T) at T<150 K. The NMR data at high temperature are in favor of the mainly localized character of 5f electrons in \delta phase of the alloy with characteristic spin-fluctuation energy \Gamma(T) T^{0.35(5)}, which is close to $\Gamma(T) T^{0.5} predicted by Cox et al. [J. Appl. Phys. 57, 3166 (1985)] for 3D Kondo-system above T_Kondo}. The dynamic spin correlations of 5f electrons become essential to consider for {69}^T_{1}^{-1}(T) only at T<100 K. However, no NMR evidences favoring formation of the static magnetic order in \delta-Pu were revealed down to 5K .