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Sieverts, A.

doi:10.1002/ange.19070203705

Cited by 27 publications

(40 citation statements)

References 38 publications

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“…[ 10 ] Figure 2 c shows the result of a "Sieverts analysis" for the low concentration ( α -phase) region, using Sieverts law p 0.5 = K Sieverts * C . [ 11 ] Plotting the obtained Sieverts constants K LSPR (from the LSPR measurement) and K Sieverts, QCM (from the QCM) versus 1/ T , yielded the enthalpy and entropy of hydrogen dissolution in the nanodisk (from the slope and intersect, respectively). As seen in Figure 2 c, the agreement between QCM and LSPR based data is excellent, yielding basically identical hydrogen dissolution enthalpies (fi rst table in Figure 2 e).…”

Section: Doi: 101002/adma201000973mentioning

confidence: 99%

Localized Surface Plasmons Shed Light on Nanoscale Metal Hydrides

et al. 2010

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Section: Doi: 101002/adma201000973mentioning

confidence: 99%

Localized Surface Plasmons Shed Light on Nanoscale Metal Hydrides

et al. 2010

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“…According to Sieverts the concentration c H (given by the number of H-atoms per metal-atoms H/M) inside a metal is connected with the gas-pressure p H2 expressed by the solubility S 0 , c H =S 0 Öp H2 . [1] This equation holds for the low-concentration-range for all metals at the most up to the concentration where a hydride is formed. This concentration is called the solubility limit.…”

mentioning

confidence: 99%

Hydrogen in Nano‐sized Metals

Pundt¹

2004

Adv Eng Mater

147

101

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Nano-sized metal systems have received growing attention during the last decade which is not only motivated by the technological interest in low-dimensional systems providing the size reduction of electronic devices, but also by fundamental interest since physical properties tend to show interesting changes when the size of the system is reduced. So called finite-size effects become relevant as soon as the system-size is in the order of the correlation length of the system. Surface-as well as interface-effects influence strongly the system behaviour when their relative fraction compared to the volume increases. Furthermore, often substrate contributions influence the system properties. All these contributions become more relevant when the system size goes down to the nanometer-range. This range is, especially with regard to applications, a major field of interest: low-dimensional patterning of electronic devices still can increase the information density or might reduce the size of the product of interest. On the other hand, surface related processes, for example catalysts demand for nano-sized materials providing a large amount of active surface area. Physical properties of these systems, for example phase boundaries and lattice structures, tend to be quite different from those of the large size ªbulkº system. Therefore, the understanding of general rules or trends occurring at minimisation of metal-systems is an important problem that still needs to be solved.Nano-sized metal systems are mostly found in the shape of thin films, rods or clusters. Also stacking of nano-sized systems in so-called multi-layers causes interesting sample morphologies with a high density of interface volume (see Fig. 1).The physical properties of such nano-sized systems can be studied by choosing systems with a highly mobile alloying partner: the metal-hydrogen systems. The big advantage of such a system is that alloying is possible just by increasing the partial hydrogen-gas pressure (or chemical potential). According to Sieverts the concentration c H (given by the number of H-atoms per metal-atoms H/M) inside a metal is connected with the gas-pressure p H2 expressed by the solubility S 0 , c H =S 0 Öp H2 . [1] This equation holds for the low-concentration-range for all metals at the most up to the concentration where a hydride is formed. This concentration is called the solubility limit. The solubility S 0 varies significantly, for example for bulk Yttrium (Y) or Niobium (Nb) it is up to 10 11 or 10 3 , respectively, down to small values of 10 ±1 for bulk Palladium (Pd) or 10 ±20 for Tungsten (W). This implies huge differences in the hydrogen concentration for different metals at the same hydrogen gas pressure (chemical potential). However, the solubility for the nano-sized system can be different compared to bulk.Because of its small size and its ability to tunnel between neighbouring interstitial lattice sites, hydrogen is highly mobile. Diffusion constants such as 3´10 ±7 cm 2 /s for Pd (at 300 K) are usual, resulting in diffusio...

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“…The absorption of gases by metals is described by Sievert's law [13,14]. Here we follow the line of thought and approximate the chemical potential for H 2 O gas by that for the ideal gas,…”

Section: Results Of the Measurementmentioning

confidence: 99%

A Thermodynamic Consideration on the Mechanism of Ultrasensitive Moisture Sensing by Amorphous Silica

et al. 2017

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We detected the change in the phase velocity of surface acoustic waves propagating along the amorphous silica layer on a spherical single-crystal quartz due to the very small amount of moisture at less than 1 µmol·mol −1 in the ambient N 2 gas. This was made possible for the first time because this system, called a ball SAW moisture sensor, was extremely sensitive. The measured phase velocity changed as a function of moisture density and temperature and was fitted strikingly well with a thermodynamic model assuming that dissociated H + and OH − dissolved into the amorphous silica layer at room temperature.

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Über Legierungen

Cited by 27 publications

References 38 publications

Localized Surface Plasmons Shed Light on Nanoscale Metal Hydrides

Localized Surface Plasmons Shed Light on Nanoscale Metal Hydrides

Hydrogen in Nano‐sized Metals

A Thermodynamic Consideration on the Mechanism of Ultrasensitive Moisture Sensing by Amorphous Silica

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