Kinetics of hydrogen in Zr–H and Zr–D systems

Grib, Alexander; Khadzhay, George; Merisov, B. A.; Vinogradov, Dmitry; Tikhonovsky, М.А.

doi:10.1016/j.ijhydene.2010.02.139

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…The SAED pattern in Fig. 3(b) is a composite one consisting of the [010] from the α-Zr alloy matrix and the [1][2][3][4][5][6][7][8][9][10] zone axis of the δ-type Zr hydride consistent with commonly acceptable statements that the δ-type Zr hydride is the most predominant phase at room temperature [15]. The enlarged HRTEM images from the Zr alloy matrix and the δ-type Zr hydride are separately shown in Fig.…”

Section: Electron Microscopy Characterizationssupporting

confidence: 66%

“…Metal hydrides are one option under consideration for hydrogen storage in solid state for alternative energy applications. Zirconium [1][2][3] and its alloys [4][5][6] are important H storage materials owing to their high storage capacity of H [3] and strong stability of Zr hydrides [7,8]. The main requirements of a H storage material are very low absorption pressure at room temperature and a high H storage capacity.…”

Section: Introductionmentioning

confidence: 99%

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Direct observation of hydrogenation and dehydrogenation of a zirconium alloy

Shen

Chen

et al. 2016

Journal of Alloys and Compounds

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The hydrogenation and dehydrogenation behaviors of a zirconium alloy were in-situ studied by scanning electron microscopy and transmission electron microscopy. The zirconium alloy can absorb hydrogen to form Zr hydride which is enhanced by the relaxation of inner stress in the alloy. The hydrogen is generated from an ion/electron beam stimulated decomposition of an organometallic precursor, trimethyl (methylcyclopentadienyl) platinum (IV), in a scanning electron microscope and focused ion beam system. The formed δ-type zirconium hydride that has a face centered cubic structure was observed to grow as preferentially oriented platelets in the zirconium alloy matrix. The platelets have a common crystallographic relationship of [010] α //[1-10] δ , (001) α //(111) δ. The dehydrogenation of the zirconium hydride was in-situ investigated in a transmission electron microscope by heating the materials. It was found that the δ-ZrH 1.5-1.66 hydride transformed into ζ-ZrH 0.25 at 450 C even at a longer heating time. The experiment demonstrates a new way for in-situ study of hydrogenation behaviors of other hydrogen storage alloys.

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Section: Electron Microscopy Characterizationssupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Direct observation of hydrogenation and dehydrogenation of a zirconium alloy

Shen

Chen

et al. 2016

Journal of Alloys and Compounds

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“…The described relaxation process is similar to the exponential relaxation of the electrical resistance during the formation of the ordered solid solution of the hydrogen in the zirconium. [ 21 ] We suppose that in the present case, the amount of such an ordered solid solution of the hydrogen in Ti 3 AlC 2 was too small because of the small content of the hydrogen in the MAX phase (about 1% (at)), so we did not find it by the X‐ray diffraction method. To reveal this phase, one must increase the solubility of the hydrogen by increasing the temperature of absorption.…”

Section: Resultsmentioning

confidence: 73%

Parameters of the Unit Cell of the Ti₃AlC₂ MAX‐Phase with Hydrogen

Grib

Samsonik

Prikhna

et al. 2022

Physica Status Solidi (b)

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Investigations of the penetration of hydrogen into ternary carbides (the so‐called MAX phases) become topical because it has been found recently that these materials can be protective coatings. Herein, near‐surface layers of two bulk samples of the Ti3AlC2 MAX phase are saturated electrolytically several times by hydrogen. Parameters of the hexagonal unit cell are measured by means of X‐ray diffractometry after each saturation of the same sample. It is found that the increase in the distance between the base planes of the unit cell is ten times larger than the increase of the side of the unit cell in the base plane. The estimated amount of hydrogen that remains in the lattice at room temperature is about 1.6% (at). It is found that the sample can be saturated by hydrogen up to 3% (at), but the lattice relaxes with time. The relaxation time for the distance between base planes is about 60% of that for the side of the lattice in the base plane.

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“…The electrical properties of the Zr-H system were measured experimentally for different purposes, such as researching the hydrogen kinetics 16 , the thermal properties 17 , and the isotope effect 18,19 . Unlike the Pd-H system, the phonon distribution in the Zr-H system can be described by linear-response theory since the hydrogen atoms in Zr behave like "Einstein" oscillators (independent simple harmonic oscillators).…”

Section: Introductionmentioning

confidence: 99%

Influence of hydrogen on electron-phonon coupling and intrinsic electrical resistivity in zirconium: A first-principles study

2019

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This paper presents the first-principles calculation of the electron-phonon coupling and the temperature dependence of the intrinsic electrical resistivity of the zirconium-hydrogen system with various hydrogen concentrations. The nature of the anomalous decrease in the electrical resistivity of the Zr-H system with the increase of hydrogen concentration (at high concentrations of H/Zr>1.5) is studied. It was found that the hydrogen concentration, where the resistivity starts to decrease, is very close to the critical concentration of the δ-ε phase transition. It is shown that the tetragonal lattice distortion due to the δ-ε phase transition of the Zr-H system eliminates imaginary phonon frequencies and the strong electron-phonon coupling of the δ phase and, as a result, leads to the reduction of the electrical resistivity of the Zr-H system at a high hydrogen concentration.

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Kinetics of hydrogen in Zr–H and Zr–D systems

Cited by 8 publications

References 12 publications

Direct observation of hydrogenation and dehydrogenation of a zirconium alloy

Direct observation of hydrogenation and dehydrogenation of a zirconium alloy

Parameters of the Unit Cell of the Ti₃AlC₂ MAX‐Phase with Hydrogen

Influence of hydrogen on electron-phonon coupling and intrinsic electrical resistivity in zirconium: A first-principles study

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Kinetics of hydrogen in Zr–H and Zr–D systems

Cited by 8 publications

References 12 publications

Direct observation of hydrogenation and dehydrogenation of a zirconium alloy

Direct observation of hydrogenation and dehydrogenation of a zirconium alloy

Parameters of the Unit Cell of the Ti3AlC2 MAX‐Phase with Hydrogen

Influence of hydrogen on electron-phonon coupling and intrinsic electrical resistivity in zirconium: A first-principles study

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Parameters of the Unit Cell of the Ti₃AlC₂ MAX‐Phase with Hydrogen