Hydrogen diffusion in titanium at room temperature

Malyshev, L. G.; Лебедев, С. А.; Ryabov, R. A.; Gel’d, P. V.; Кузнецов, С. А.

doi:10.1007/bf00891692

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…The hydrogen diffusion coefficients at low temperature are basically extrapolated from the diffusion coefficient equation obtained at high temperature. Some studies showed that the hydrogen diffusion coefficient at low temperature obtained by this method is not reliable (Malyshev et al, 1982). Wipf et al (1999) showed that hydrogen diffusion in titanium has tunnel diffusion at low temperatures.…”

Section: Figurementioning

confidence: 99%

Research progress on the hydrogen permeation behavior of the nuclear waste container–A mini review

Zhang

Jiang²,

Zhang³

et al. 2022

Front. Mater.

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A large amount of nuclear waste produced in the process of nuclear energy utilization has always been a key problem to be solved urgently for nuclear safety. At present, “deep geological disposal” is a feasible method and is generally accepted by many countries. It is a “multi-barrier system” composed of an artificial barrier, including the solidified waste body, outer packaging material, buffer backfill material, and a natural barrier including the surrounding rock. During deep geological disposal, a near-field environment, where the corrosion of a container could happen, is formed with continuous groundwater infiltration and the release of much heat energy in the process of nuclear waste decay and fission. At the same time, the environment will become a long-term reduction place because of the gradual consumption of the initially retained oxygen. The hydrogen evolution reaction is dominant, so unpredictable hydrogen embrittlement of the container materials could happen due to hydrogen absorption and penetration. This study summarizes the possibility of hydrogen embrittlement of carbon steel, titanium, and their alloys from three aspects, namely, hydrogen solubility, diffusion coefficient, and hydrogen embrittlement, which provides a theoretical basis for predicting the container life in a large time scale.

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Section: Figurementioning

confidence: 99%

Research progress on the hydrogen permeation behavior of the nuclear waste container–A mini review

Zhang

Jiang²,

Zhang³

et al. 2022

Front. Mater.

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Elementary excitations in the coupled spin-orbital model

et al. 1998

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The elementary excitations of a model Hamiltonian that captures the low-energy behavior of a simple twofold-degenerate Hubbard Hamiltonian, with Hund's rule coupling, is studied. The phase diagram in the mean-field limit and in a two-site approach reveals a rich variety of phases where both the orbital and the spin degrees of freedom are ordered. We show that, besides the usual spin waves ͑magnons͒, there also exist orbital waves ͑orbitons͒ and, most interestingly, in a completely ferromagnetically coupled system, a combined spinorbital excitation which can be visualized as a bound state of magnons and orbitons. For a completely degenerate system the bound states are found to be the lowest-lying elementary excitations, both in one and two dimensions. Finally we extend our treatment to almost-degenerate systems. This can serve as an example that elementary excitations in orbitally degenerate strongly correlated electron systems in general carry both spin and orbital character. ͓S0163-1829͑98͒10839-1͔

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Phase diagram of the half-filled two-dimensionalSU(N)Hubbard-Heisenberg model: A quantum Monte Carlo study

Assaad¹

2005

Phys. Rev. B

129

142

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We investigate the phase diagram of the half-filled SU (N ) Hubbard-Heisenberg model with hopping t, exchange J and Hubbard U , on a two-dimensional square lattice. In the large-N limit, and as a function of decreasing values of t/J, the model shows a transition from a d-density wave state to a spin dimerized insulator. A similar behavior is observed at N = 6 whereas at N = 2 a spin density wave insulating ground state is stabilized. The N = 4 model, has a d-density wave ground state at large values of t/J which as a function of decreasing values of t/J becomes unstable to an insulating state with no apparent lattice and spin broken symmetries. In this state, the staggered spin-spin correlations decay as a power-law, resulting in gapless spin excitations at q = (π, π). Furthermore, low lying spin modes with small spectral weight are apparent around the wave vectors q = (0, π) and q = (π, 0). This gapless spin liquid state is equally found in the SU (4) Heisenberg (U/t → ∞ ) model in the self-adjoint antisymmetric representation. An interpretation of this state in terms of a π-flux phase is offered. Our results stem from projective (T = 0) quantum Monte-Carlo simulations on lattice sizes ranging up to 24 × 24.

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Hydrogen diffusion in titanium at room temperature

Cited by 5 publications

References 3 publications

Research progress on the hydrogen permeation behavior of the nuclear waste container–A mini review

Research progress on the hydrogen permeation behavior of the nuclear waste container–A mini review

Elementary excitations in the coupled spin-orbital model

Phase diagram of the half-filled two-dimensionalSU(N)Hubbard-Heisenberg model: A quantum Monte Carlo study

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