Determination of the hydrogen diffusion mechanism in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-titanium hydride using nuclear magnetic resonance

Bustard, L.D.; Cotts, R. M.; Seymour, E F W

doi:10.1103/physrevb.22.12

Cited by 55 publications

(5 citation statements)

References 17 publications

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“…The results on hydrogen diffusion coefficient reported by different authors [22,23,[27][28][29] are nearly the same. The data reported by Kaess et al [22] were used and Eq.…”

Section: Hydrogen Diffusion In Titanium Hydridessupporting

confidence: 81%

Thermodynamics approach to the hydrogen diffusion and phase transformation in titanium particles

Gao

Zhou

et al. 2011

Journal of Alloys and Compounds

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“…The results on hydrogen diffusion coefficient reported by different authors [22,23,[27][28][29] are nearly the same. The data reported by Kaess et al [22] were used and Eq.…”

Section: Hydrogen Diffusion In Titanium Hydridessupporting

confidence: 81%

Thermodynamics approach to the hydrogen diffusion and phase transformation in titanium particles

Gao

Zhou

et al. 2011

Journal of Alloys and Compounds

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“…This compares well with the experimental values of the bulk hydrogen diffusion in TiH 2 : Bustard et al report energy barriers of 0.53 eV in TiH ≃1.7 . 62 This corroborates the relatively high mobility of hydrogen in Ti; the numbers may be compared to hydrogen diffusion in V (Δ E diff = 0.045 eV), 63 Ni (Δ E diff = 0.40 eV), 63 and in Mg (Δ E diff = 0.24 eV) 64 and MgH 2 (Δ E diff ≃1 eV). 65 The case of Mg is particularly illustrative, as hydrogen diffusion in Mg is relatively fast, while long-range diffusion in MgH 2 can be considered as nonexistent.…”

Section: Discussionsupporting

confidence: 69%

Surface Properties of the Hydrogen–Titanium System

2021

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Titanium is an excellent getter material, catalyzes gas−solid reactions such as hydrogen absorption in lightweight metal hydrides and complex metal hydrides and has recently been shown as a potential ammonia synthesis catalyst. However, knowledge of the surface properties of this metal is limited when it absorbs large quantities of hydrogen at operation conditions. Both the conceptual description of such a surface as well as the experimental determination of surface hydrogen concentration on hydride-forming metals is challenging due to the dynamic bulk properties and the incompatibility of traditional surface science methods with the hydrogen pressure needed to form the metal hydride, respectively. In this paper, the surface pressure-composition isotherms of the titanium−hydrogen system are measured by operando reflecting electron energy loss spectroscopy (REELS). The titanium thin films were deposited on and hydrogenated through a palladium membrane, which provides an atomic hydrogen source under ultrahigh vacuum conditions. The measurements are supported by density functional theory calculations providing a complete picture of the hydrogen-deficient surface of TiH 2 being the basis of its high catalytic activity.

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“…In consequence, much knowledge was acquired. For example, in the titanium containing higher concentration of hydrogen, titanium atoms span a slightly tetragonally distorted face centered tetragonal lattice and hydrogen atoms occupied tetrahedral interstitial sites [1,2]. In the study of diffusion of hydrogen in the titanium, Wipf et al determined the diffusion coefficient of hydrogen in titanium hydride and have reported that the activation energy of diffusion was 0.49 eV [3].…”

Section: Introductionmentioning

confidence: 99%

Distribution of Hydride in Titanium Determined by X-Ray Diffraction-Enhanced Imaging Method with Asymmetric Reflection Analyzer

Mizuno

Kanai

Hirano

et al. 2009

Trans. Mat. Res. Soc. Japan

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The X-ray refraction imaging technique, diffraction-enhanced X-ray imaging (DEI) method with an asymmetric reflection analyzer was applied to determine the distribution profile of hydride in titanium. Horizontal magnification of the image by the asymmetric reflection was 9 times. Hydride was formed on titanium surface by electrolytic-charging at room temperature for 10, 25.5, 48 and 150 h. The specimen was cut into a 1-mm thick slice for cross-sectional observation. Hydride layer was observed by DEI method as a thick black or white line parallel to the surface. X-ray intensity profile of hydride was measured from the DEI image and converted to the deviation angle of X-ray by refraction using the observed rocking curve. The distribution of refraction index was calculated from the deviation angle of X-ray using Snell's low. Finally distribution of ratio of hydride and titanium, the concentration profile of hydride, was obtained from that of the refraction index. The distribution profile of hydride in titanium was determined to accuracy of the order of micrometer by means of the DEI method with asymmetric reflection analyzer.

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Determination of the hydrogen diffusion mechanism inγ-titanium hydride using nuclear magnetic resonance

Cited by 55 publications

References 17 publications

Thermodynamics approach to the hydrogen diffusion and phase transformation in titanium particles

Thermodynamics approach to the hydrogen diffusion and phase transformation in titanium particles

Surface Properties of the Hydrogen–Titanium System

Distribution of Hydride in Titanium Determined by X-Ray Diffraction-Enhanced Imaging Method with Asymmetric Reflection Analyzer

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