We investigated the hydrogen effect on superconductivity in the (Ni0.36Nb0.24Zr0.40)(100-x)H(x)(0 < or = x < or = 6.4) glassy alloys with nanoclusters, as a function of temperature. The resistivity of these alloys started to drop from onset temperature of around 9.5 K. The (Ni0.36Nb0.24Zr0.40)98.6H1.6 showed zero resistance at 2.1 K. However, the application of a magnetic field > 4.6 T arrested the drop of resistivity, showing the existence of superconductivity of type II. The maximum onset temperature of 11.3 K was observed at 4.4 at% H. The superconducting behavior of the glassy alloys would be associated with electron pair transport along zigzag paths, which link the shortened atomic -Ni-Ni-Ni- array in the Zr5Ni5Nb3 clusters, and tunneling among the clusters.
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http://dx.doi.org/10.1166/jnn.2010.2381 | DOI Listing |
J Am Chem Soc
December 2024
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, U.K.
Melt alloying, the process of melting a physical powder blend to create a homogeneous alloy, is widely used in materials processing. By carefully selecting the materials and their proportions, the physical properties of the resulting alloy can be precisely controlled. In this study, we investigate the possibility of utilizing melt alloying principles for meltable two-dimensional hybrid organic-inorganic perovskites (2D-HOIPs).
View Article and Find Full Text PDFMaterials (Basel)
October 2024
Faculty of Physics and Applied Computer Science, AGH University of Krakow, Mickiewicza 30, 30-059 Krakow, Poland.
The amorphous materials of the TiZrNi composition synthesized by mechanical alloying are widely recognized for their ability to store hydrogen with gravimetric densities above 2 wt.%. It is also known that those alloys can form a quasicrystalline state after thermal treatment and their structural and hydrogen sorption properties can be altered by doping with various elements.
View Article and Find Full Text PDFPhys Rev E
September 2024
School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.
The liquid state thermophysical properties and amorphous solidification kinetics of Fe_{50-x}Co_{x}Cr_{14}Mo_{14}C_{9}B_{8}Tm_{5} (x=10, 15, 20, and 25) alloys were explored by electromagnetic and electrostatic levitation techniques. It was found that the surface tension of liquid alloys with Fe contents below 30 at. % had a strong temperature dependence.
View Article and Find Full Text PDFMaterials (Basel)
September 2024
School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
Materials (Basel)
August 2024
Institute for Technology of Nuclear and Other Mineral Raw Materials, Franchet d'Esperey 86, 11000 Belgrade, Serbia.
The presented work offers an innovative process scheme for valorizing Pb-Zn slag, which involves crushing, grinding, and separation techniques to concentrate valuable components (non-ferrous metals). This methodology could have a significant impact on the global beneficiation of metallurgical slags since it is significantly more simple, environmentally friendly, and cost-effective than standard pyro- and hydrometallurgical procedures. According to previous physicochemical and mineralogical studies, Pb-Zn slag is a valuable secondary raw material.
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