Author CINN

The most innovative designers consciously reject the standard option box and cultivate an appetite for thinking wrong.

19

Sep 2018

Poster contribution at the 30th Symposium on Fusion Technology

Posted by / in Blog Big Science, Featured News / No comments yet

Spark Plasma Sintering (SPS) is a promising technology for the fabrication of structural materials for fusion reactors. In particular it has emerged as a potential alternative for the fabrication of  Oxide-Dispersion Strengthened Ferritic Steels, which are candidate materials for the future DEMO fusion reactor.

Researchers from the CINN in collaboration with colleagues from CEIT-IK4 have studied the effect of the SPS sintering process on the microstructure of ferritic steels with oxide nanoparticles. The challenge was to increase the density of dislocations, preferred nucleation sites, and enhance the precipitation of oxide nanoparticles.

A poster summarizing the results of the research with the title “Microstructural comparison of Oxide-Dispersion Strengthened Ferritic Steels produced by HIP and SPS” will be presented at the 30th Symposium on Fusion Technology (SOFT 2018).

 

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17

Sep 2018

Researchers from the University of Delft and the CINN observe for the first time electron interference at room temperatures and conditions using graphene bilayers

Posted by / in Blog ICT, Featured News, News Modelling & Simulation / No comments yet

Researchers from the Kavli Institute of Nanoscience of the University of Delft in the Netherlands have developed a device that allow them to control with atomic precision the slide of two sheets of graphene one over the other. The researchers have measured the electrical current flowing through the device and observed that the intensity of that current had strong oscillations. Moreover, they are able to reproduce the same oscillations at room temperatures and conditions as many times as they want.

In paralell, researchers from the Department of Physics of the University of Oviedo and the Nanomaterials and Nanotechnology Research Center (CINN), joint research center of the CSIC, the University of Oviedo and the Principality of Asturias, have analyzed this phenomenon from a theoretical point of view and they have managed to show that the source of these experimentally observed oscillations lies in the wave nature of the electrons. The electronic waves bounce over and over again at the edges of the graphene sheets and produce a pattern of interference, which causes the oscillatory character of the electric current measured experimentally. Moreover, they have shown that these oscillations depend on the difference in the distances traveled by the different electronic waves when reflected at the edges, and therefore depend on the relative position of the two grahene sheets.

The CINN research team is led by Jaime Ferrer (Full Professor of Physics) and the professors Víctor García Suárez and Amador García Fuente, all of them scientists of the Department of Physics of the University of Oviedo.

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10

Sep 2018

Investigation of the order -disorder phase transition series in AuCu by in-situ temperature XRD and mechanical spectroscopy

Posted by / in Latest CINN Publications, Publications 2019, Publications Multifunctional Nanocomposites 2019, Publications: Multifunctional Nanomaterials & Nanocomposites / No comments yet

In-situ temperature XRD and mechanical spectroscopy were applied to study phase transitions in AuCu alloy from the disordered FCC state (A1). The phase transition temperature intervals were investigated upon heating and cooling using a rate of 1 K/min in order to be thoroughly determined. The following sequences of phase transitions were recorded upon continuous heating: A1->AuCuI ->AuCuII->A1 and on subsequent cooling: A1 ->A1þAuCuIþAuCuII ->AuCuIþAuCuII ->AuCuI. This transition sequences determine also temperature dependency of elastic and anelastic properties. Mechanical spectroscopy using a forced torsion pendulum shows a peak due to antiphase boundaries motion characterizing the orthorhombic phase AuCuII and a transient peak with the that appears in the tetragonal phase AuCuI together with the classical Zener peak in the A1 phase.

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