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Hydrogen absorption kinetics and optical properties of Pd-doped Mg thin films
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10.1063/1.2214208
/content/aip/journal/jap/100/2/10.1063/1.2214208
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/2/10.1063/1.2214208

Figures

Image of FIG. 1.
FIG. 1.

Compositional dependence of the film thickness of samples, immediately after sputtering (open circles), in the hydrogenated state (filled circles) and calculated assuming the formation of (stars).

Image of FIG. 2.
FIG. 2.

XRD patterns of (▵), (엯), (◻), and Mg (☆) thin films (a) as-sputtered, (b) after hydrogenation, and (c) after dehydrogenation.

Image of FIG. 3.
FIG. 3.

(Color online) Reflection of as-sputtered (with , 0.05, and 0.10) thin films (capped with Pd) measured through the quartz substrate. Literature values for Mg (Ref. 24) and Pd (Ref. 25) are included for comparison.

Image of FIG. 4.
FIG. 4.

(Color online) Time dependence of the electrical resistivity of (with , 0.05, and 0.10)/ Pd thin films, upon exposure to hydrogen pressure at room temperature. The insert is a blowup of the curves for the first .

Image of FIG. 5.
FIG. 5.

Variation of the electrical resistivity of as a function of the Pd-concentration : (◻) this work, (▴) from Ref. 13 and solid line: fitting of experimental data by Eq. (2).

Image of FIG. 6.
FIG. 6.

Optical reflection (squares) and transmission (circles) of (with , 0.05, and 0.10)/ Pd thin films after of exposure to hydrogen pressure at room temperature. Solid lines correspond to the fitting of the curves using Eq. (4).

Image of FIG. 7.
FIG. 7.

(Color online) Absorption coefficient of hydrogenated with (a) , (b) , and (c) , calculated from Eq. (3). Solid lines correspond to the extrapolation of the linear increase of caused by the opening of the band gap; the lines are assumed to cross the energy axis at . The insert shows the compositional dependence of (▴ from Ref. 13).

Image of FIG. 8.
FIG. 8.

(Color online) Dielectric constants (filled symbols) and (open symbols) of (with , 0.05, and 0.10), calculated from Eq. (4).

Image of FIG. 9.
FIG. 9.

Evolution of the optical transmission of a gradient sample (with ) exposed to at room temperature, as a function of time. RBS measurements show a linear compositional gradient over the whole sample.

Image of FIG. 10.
FIG. 10.

(Color online) Variation of the logarithm of transmission as a function of time for different composition of gradient sample exposed to hydrogen pressure at room temperature: (◻) , (▿) , (◁) , (▷) , (▵) , and (엯) .

Image of FIG. 11.
FIG. 11.

Hydrogen absorption rate as a function of the Pd concentration in thin film. The solid line is added to highlight the almost linear behavior.

Image of FIG. 12.
FIG. 12.

Time dependence of the electrical resistivity of exposed to air at room temperature. Horizontal arrows indicate the measured values before hydrogenation and after dehydrogenation in air.

Tables

Generic image for table
Table I.

Refined parameters obtained by fitting reflection and transmission curves of using Eq. (4). Units are eV if not specified (except , no units).

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/content/aip/journal/jap/100/2/10.1063/1.2214208
2006-07-21
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hydrogen absorption kinetics and optical properties of Pd-doped Mg thin films
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/2/10.1063/1.2214208
10.1063/1.2214208
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