Browsing by Author N.-T.H. Kim-Ngan

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  • Hydrogen-storage-characteristics-of-Ti-and-V-based-thin-films_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Z. Tarnawski; N.-T.H. Kim-Ngan (2016)

  • Series of thin films of single-, bi- and tri-layered structure consisting of Ti, V, TiO2 and V2O5 layer and/or mixed Ti- V- Ni layer with different layer sequences and thicknesses were prepared by the sputtering technique on Si and SiO2 substrates. The layer chemical composition and thickness were determined by a combined analysis of X-ray diffraction, X-ray reflectometry, Rutherford backscattering and optical reflectivity spectra. Thefilms were hydrogenated at 1 bar at 300 C and/or at high pressures up to 100 bar at room temperature. The hydrogen concentration and hydrogen profile was determined by means of a secondary ion mass spectroscopy and N-15 Nuclear Reaction Analysis. The ...

  • Superconductivity-in-U-T-alloys-T-Mo-Pt-Pd-Nb-Zr-stabilized-in-the-cubic-U-structure-by-splat-cooling-technique_2016_Journal-of-Science-Advanced-Mater.pdf.jpg
  • Article


  • Authors: N.-T.H. Kim-Ngan; L. Havela (2016)

  • We succeed to retain the high-temperature (cubic)g-U phase down to low temperatures in U-T alloys with less required T alloying concentration (T¼Mo, Pt, Pd, Nb, Zr) by means of splat-cooling technique with a cooling rate better than 10 6 K/s. All splat-cooled U-T alloys become superconducting with the critical temperature T c in the range of 0.61 Ke2.11 K. U-15 at.% Mo splat consisting of the y-U phase with an ideal bcc A2 structure is a BCS superconductor having the highest critical temperature (2.11 K)

  • Variations-of-magnetic-properties-of-UH3-with-modified-structure-and-composition_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: M. Paukov; L.Havela; N.-T.H. Kim-Ngan; V. Buturlim; I. Tkach; D. Drozdenko; S. Maskova; S. Sowa; Z. Molcanova; M. Mihalik; M. Krupska (2016)

  • UH3 based hydrides with modified structure and composition can be prepared using high H2pressures from precursors in the form of rapidly cooled uranium alloys. While the alloys with a-U structure lead to theb-UH3 type of hydrides,g-U alloys (bcc) lead either toa-UH3hydride type or nanocrystallineb-UH3. The nanocrystallineb-UH3structure, appearing for Mo alloying, can accommodate in addition numerous otherd-metal components, as Ti, Zr, Fe, Nb. The pure Mo alloyed hydrides (UH3)1-xMox exhibit increasing Curie temperature TC with maximum exceeding 200 K forx¼0.12e0.15. Other components added reduce the TC increment with respect to pure UH3 (170 K). Also alloying by Zr gives a weake...

Browsing by Author N.-T.H. Kim-Ngan

Jump to: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or enter first few letters:  
Showing results 1 to 3 of 3
  • Hydrogen-storage-characteristics-of-Ti-and-V-based-thin-films_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Z. Tarnawski; N.-T.H. Kim-Ngan (2016)

  • Series of thin films of single-, bi- and tri-layered structure consisting of Ti, V, TiO2 and V2O5 layer and/or mixed Ti- V- Ni layer with different layer sequences and thicknesses were prepared by the sputtering technique on Si and SiO2 substrates. The layer chemical composition and thickness were determined by a combined analysis of X-ray diffraction, X-ray reflectometry, Rutherford backscattering and optical reflectivity spectra. Thefilms were hydrogenated at 1 bar at 300 C and/or at high pressures up to 100 bar at room temperature. The hydrogen concentration and hydrogen profile was determined by means of a secondary ion mass spectroscopy and N-15 Nuclear Reaction Analysis. The ...

  • Superconductivity-in-U-T-alloys-T-Mo-Pt-Pd-Nb-Zr-stabilized-in-the-cubic-U-structure-by-splat-cooling-technique_2016_Journal-of-Science-Advanced-Mater.pdf.jpg
  • Article


  • Authors: N.-T.H. Kim-Ngan; L. Havela (2016)

  • We succeed to retain the high-temperature (cubic)g-U phase down to low temperatures in U-T alloys with less required T alloying concentration (T¼Mo, Pt, Pd, Nb, Zr) by means of splat-cooling technique with a cooling rate better than 10 6 K/s. All splat-cooled U-T alloys become superconducting with the critical temperature T c in the range of 0.61 Ke2.11 K. U-15 at.% Mo splat consisting of the y-U phase with an ideal bcc A2 structure is a BCS superconductor having the highest critical temperature (2.11 K)

  • Variations-of-magnetic-properties-of-UH3-with-modified-structure-and-composition_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: M. Paukov; L.Havela; N.-T.H. Kim-Ngan; V. Buturlim; I. Tkach; D. Drozdenko; S. Maskova; S. Sowa; Z. Molcanova; M. Mihalik; M. Krupska (2016)

  • UH3 based hydrides with modified structure and composition can be prepared using high H2pressures from precursors in the form of rapidly cooled uranium alloys. While the alloys with a-U structure lead to theb-UH3 type of hydrides,g-U alloys (bcc) lead either toa-UH3hydride type or nanocrystallineb-UH3. The nanocrystallineb-UH3structure, appearing for Mo alloying, can accommodate in addition numerous otherd-metal components, as Ti, Zr, Fe, Nb. The pure Mo alloyed hydrides (UH3)1-xMox exhibit increasing Curie temperature TC with maximum exceeding 200 K forx¼0.12e0.15. Other components added reduce the TC increment with respect to pure UH3 (170 K). Also alloying by Zr gives a weake...