Zirkonium, Thorium und Wasserstoff

Sieverts, A.; Roell, Ernst

doi:10.1002/zaac.19261530130

Cited by 26 publications

(5 citation statements)

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“…Experimental data on hydrogen solubility in metal have been reported. − The experimental data under hydrogen pressure of 0.1 MPa are fitted by eqs , , , , and as shown in Figures − . The metal-hydrogen phase diagrams for α, α′, β, γ, δ, and ϵ phases are also plotted .…”

Section: Resultsmentioning

confidence: 99%

A Statistical−Mechanical Method to Evaluate Hydrogen Solubility in Metal

Ogawa

2010

J. Phys. Chem. C

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We propose a site-occupying model (SOM) to evaluate hydrogen solubility in metal because there is a discrepancy between the concept of the site-blocking model and experimental fact, as shown in this work. SOM is based on the experimental fact that hydrogen atoms in metal cannot come closer to each other than about 0.21 nm under hydrogen pressure of 1 MPa or less. We evaluate the hydrogen solubility by developing a statistical-mechanical method which considers partition functions for translational motion, configuration, vibration, rotation, and spin weights. SOM is verified by agreement with experimental data on hydrogen solubility in metal. We also compare SOM with the site-blocking model, and find that the theoretical curves from SOM agree well with the experimental data even at high hydrogen solubility of over 0.5 H/M by atomic ratio (hydrogen/metal).

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Section: Resultsmentioning

confidence: 99%

A Statistical−Mechanical Method to Evaluate Hydrogen Solubility in Metal

Ogawa

2010

J. Phys. Chem. C

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“…Absorption isotherms.--Sieverts and Roell (10) first studied absorption isotherms on samples of metal powders containing 91% zirconium at 800 ~ and 1100~ and an absorption isobar at 760 mm of Hg hydrogen pressure. Consistent results were difficult to attain by their methods.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure and Thermodynamic Studies on the Zirconium-Hydrogen Alloys

Gulbransen

Andrew

1954

J. Electrochem. Soc.

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The phase diagram of zirconium-hydrogen alloys was studied on alloys prepared at low temperature and for alloys in the composition range of ZrH0,025 to ZrH1.96a. Decomposition pressure studies were made over the composition range and for a series of temperatures. Results of these measurements were in complete agreement with crystal structure studies on the major phases.Results show presence of two major hydride phases, namely, the ~-and e-phases as described by I-I~gg, No evidence was found for either the -y-or ~-phases of Hi~gg, although the latter phase was found only at high temperature by Hggg. The e-phase was found to have a wide range of homogeneity from ZrH~.ge5 to about ZrH1.65. The a-phase was found to have a composition near ZrH1.59 and a range of homogeneity from ZrH~.4 to ZrHI.58.A new minor transitional phase was found having the face-centered tetragonal structure and existing only in the presence of a-Zr and ~-phases. It has been designated as the -/-phase since its composition is probably near that of H/~gg's 7-phase.The free energy of formation of the ~-phase in contact with a-Zr containing hydrogen was determined from decomposition pressure data.

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“…Thorium metal has long (Winkler, 1891;Matignon & Delepine, 1901;Sieverts & Roell, 1926) been known to react with hydrogen. However, the first X-ray study of such a reaction product was not made until 1944made until (Zachariasen, 1944.…”

Section: Introductionmentioning

confidence: 99%

Crystal chemical studies of the 5f-series of elements. XIX. The crystal structure of the higher thorium hydride, Th₄H₁₅

Zachariasen¹

1953

Acta Cryst

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Zirkonium, Thorium und Wasserstoff

Cited by 26 publications

References 10 publications

A Statistical−Mechanical Method to Evaluate Hydrogen Solubility in Metal

A Statistical−Mechanical Method to Evaluate Hydrogen Solubility in Metal

Crystal Structure and Thermodynamic Studies on the Zirconium-Hydrogen Alloys

Crystal chemical studies of the 5f-series of elements. XIX. The crystal structure of the higher thorium hydride, Th₄H₁₅

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Zirkonium, Thorium und Wasserstoff

Cited by 26 publications

References 10 publications

A Statistical−Mechanical Method to Evaluate Hydrogen Solubility in Metal

A Statistical−Mechanical Method to Evaluate Hydrogen Solubility in Metal

Crystal Structure and Thermodynamic Studies on the Zirconium-Hydrogen Alloys

Crystal chemical studies of the 5f-series of elements. XIX. The crystal structure of the higher thorium hydride, Th4H15

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Crystal chemical studies of the 5f-series of elements. XIX. The crystal structure of the higher thorium hydride, Th₄H₁₅