The incoherent spinodals of hydrogen in Nb, Ta and V

Bauer, Hubert; Tretkowski, J.; Völkl, J.; Freudenberg, Uwe; Alefeld, G.

doi:10.1007/bf01317250

Cited by 15 publications

(2 citation statements)

References 18 publications

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“…We determined the thermodynamic factor and it does not go to zero in the measured concentration and temperature range. In addition we know from Bauer [27] that the incoherent boundary of the bulk has a maximum of about ∼300 K at c = 0.25. Therefore, any effect due to critical slowing down can be excluded.…”

Section: Discussionmentioning

confidence: 99%

Concentration dependence of hydrogen diffusion in clamped vanadium (0 0 1) films

Huang

Mooij

Droulias

et al. 2016

J. Phys.: Condens. Matter

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The chemical diffusion coefficient of hydrogen in a 50 nm thin film of vanadium (0 0 1) is measured as a function of concentration and temperature, well above the known phase boundaries. Arrhenius analysis of the tracer diffusion constants reveal large changes in the activation energy with concentration: from 0.10 at 0.05 in H V to 0.5 eV at 0.2 in H V. The results are consistent with a change from tetrahedral to octahedral site occupancy, in that concentration range. The change in site occupancy is argued to be caused by the uniaxial expansion of the film originating from the combined hydrogen induced expansion and the clamping of the film to the substrate.

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Section: Discussionmentioning

confidence: 99%

Concentration dependence of hydrogen diffusion in clamped vanadium (0 0 1) films

Huang

Mooij

Droulias

et al. 2016

J. Phys.: Condens. Matter

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show abstract

“…Fluctuations caused by hidden critical demixing points have been reported for metallic systems. A well-studied system is "Hydrogen in Tantalum" (Bauer et al, 1977). The strong decrease in the minimum value of [/d(0)]1/2 at increasing temperature (cf.…”

Section: Discussionmentioning

confidence: 99%

Small-angle neutron scattering study of lipid phase diagrams by the contrast variation method

Knoll¹,

Ibel²,

Sackmann³

1981

Biochemistry

117

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A small-angle neutron scattering (SANS) study of slightly sonicated liposomes of binary lipid mixtures is presented. It is demonstrated that the neutron scattering of lipid lamellae may be analyzed in terms of the Kratky--Porod model of scattering by two-dimensional systems. The contrast variation technique may thus be applied in order to study the structure and phase diagrams of lipid layers not disturbed by heavy sonication. The thickness of isolated bilayers is measured, and molar volumes of pure lipid phases are determined. Mixtures of deuterated dimyristoylphosphatidylcholine with (1) protonated dipalmitoylphosphatidylcholine and (2) protonated distearoylphosphatidylcholine, respectively, are studied. Excess volumes of lipid mixtures are determined by the contrast variation. For the first mixture positive excess volumes of +86 A3 in the crystalline phase (5 degrees C) and of +49 A3 in the fluid phase (35 degrees C) are obtained. These large positive excess volumes are interpreted in terms of free volume creation at the interface between the monolayers, which indicates that the polar head groups are rather fixed with respect to the lipid--water interface. We show that the phase boundaries at a given temperature may be determined by performing contrast variation experiments for two mixtures with different initial composition. Good agreement with existing experimental data is observed for the first mixture. A miscibility gap is established in the crystalline state of the second mixture. A most interesting result is the finding of an immiscibility in the fluid state. This is interpreted in terms of critical concentration fluctuations caused by the critical demixing point of the solid-state miscibility gap hidden below the liquidus line.

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Phase Diagrams and Statistical Thermodynamics of Binary M-H Systems

2005

The Metal-Hydrogen System

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The incoherent spinodals of hydrogen in Nb, Ta and V

Cited by 15 publications

References 18 publications

Concentration dependence of hydrogen diffusion in clamped vanadium (0 0 1) films

Concentration dependence of hydrogen diffusion in clamped vanadium (0 0 1) films

Small-angle neutron scattering study of lipid phase diagrams by the contrast variation method

Phase Diagrams and Statistical Thermodynamics of Binary M-H Systems

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