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The very low pressure obtained thanks to adsorption phenomenon at low temperature can be used to build cryogenic heat switches, which offer the possibility to make or break thermal contact between two parts of a cryogenic system. The ON (conducting) and OFF (insulating) states of the switch are obtained by varying the gas pressure between two copper blocks separated by a gap of 100μm. This pressure...
The structural thermal behaviour of three W–O–N sputtered coatings with similar metalloid to metal ratio (∼2.1) was investigated up to 900°C after annealing in a vacuum tube furnace as well as in-situ HT-XRD under a controlled atmosphere of Ar–5%H 2 . The as-deposited microstructure of the coatings consisting in a nanocomposite of low-order W–O and W–N phases evaluated differently as a function...
We present a discussion of some of the physical properties of graphene and its bilayer. In particular, we focus our attention on the calculation of the transparency of graphene and on the dependence of the energy gap of the biased graphene bilayer on the electronic density. We show that the transparency of graphene is controlled by the value of the fine structure constant over a frequency range from...
We have deposited Ti x Si y N nanocomposites by means of a custom-made cathodic arc evaporation system, using a TiSi 80/20at% compound target in a reactive Ar–N 2 atmosphere. We have studied the influence of different process parameters, like the amount of nitrogen in the gas, the total pressure, the arc current or the deposition temperature, on the properties of the material...
Protective Zr(Y)O 2−δ -based films sputter-deposited onto apatite-type lanthanum silicate ceramics were appraised for potential applications in solid oxide fuel cells with silicate-based solid electrolytes, where the performance may suffer from surface decomposition processes in reducing atmospheres. Dense and crystalline coatings were deposited using radio-frequency magnetron sputtering from...
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