TITLE

Interfacial free volumes and segregation effects in nanocrystalline Pd85Zr15 studied by positron annihilation

AUTHOR(S)
Weigand, H.; Sprengel, W.; Röwer, R.; Schaefer, H.-E.; Wejrzanowski, T.; Kelsch, M.
PUB. DATE
April 2004
SOURCE
Applied Physics Letters;4/26/2004, Vol. 84 Issue 17, p3370
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Positron annihilation spectroscopy on nanocrystalline Pd85Zr15 shows the segregation of Zr at the interfaces and a decrease of the fraction of nanovoids the size of 10 to 15 missing atoms upon isochronal annealing up to Ta=1100 K by which the grain size increases up to d=185 nm. In this state, the positron trapping at interfacial free volumes reversibly changes contingent upon the temperature whereas the interfacial composition is unchanged when the measuring temperature varies. © 2004 American Institute of Physics.
ACCESSION #
12879349

 

Related Articles

  • The thermal stability of nanocrystalline cartridge brass and the effect of zirconium additions. Atwater, Mark; Bahmanpour, Hamed; Scattergood, Ronald; Koch, Carl // Journal of Materials Science;Jan2013, Vol. 48 Issue 1, p220 

    The thermal stability of nanocrystalline cartridge brass (Cu-30 at.% Zn) and brass-Zr alloys were investigated. The alloys were produced by cryogenic ball milling and subsequently heat treated to a maximum temperature of 800 °C. The grain size of pure brass was found to be relatively stable...

  • Phase stabilization and structural studies of nanocrystalline La2O3-ZrO2. Thangadurai, P.; Bose, A. Chandra; Ramasamy, S. // Journal of Materials Science;Aug2005, Vol. 40 Issue 15, p3963 

    La2O3 doped nanocrystalline zirconia (ZrO2) has been prepared by chemical co-precipitation method for various dopant concentrations, varying from 3 to 30 mol%. Structural phases have been characterized by X-ray diffraction technique. All the as-synthesized samples were found to be in monoclinic...

  • Thermal annealing effect on magnetic properties of Fe nanoparticles implanted in yttrium-stabilized zirconia. Zhu, Xiaobin; Blois, C.; Buchanan, K. S.; Liu, Z.; Meldrum, A.; Freeman, M. R. // Journal of Applied Physics;5/15/2005, Vol. 97 Issue 10, p10N510 

    The magnetic properties of thermally annealed Fe nanocrystals prepared through ion implantation in single crystal yttrium-stabilized zirconia (Y0.2Zr0.8O19) were studied by quasistatic hysteresis loop measurements and by pulsed ferromagnetic resonance. The change of coercivity and the shape of...

  • HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO2. Kasatkin, I.; Girgsdies, F.; Ressler, T.; Caruso, R. A.; Schattka, J. H.; Urban, J.; Weiss, K. // Journal of Materials Science;Mar2004, Vol. 39 Issue 6, p2151 

    The orientation relations m(100) || t(001), m[001] || t[110]; m(011) || t(100), m[100] || t[001]; m(100) || t(110), m[001] || t[001]; m(013) || t(116), m[001] || t[001] (indices for the primitive tetragonal cell) have been found between the tetragonal (t) and monoclinic (m) domains during the...

  • Mechanism of Saturation of Nanocrystalline Powders with Interstitial Impurities upon Mechanical Dispersion. Vasil'ev, L. S.; Lomaeva, S. F. // Colloid Journal;Sep/Oct2003, Vol. 65 Issue 5, p639 

    The causes of a strong supersaturation with interstitial impurities in the process of mechanical dispersion are considered. It is shown that the effective mechanism of the saturation of nanocrystalline materials with impurities is their convective transfer by moving...

  • Zr.  // American Heritage Student Science Dictionary;2009, p375 

    The symbol for zirconium is presented.

  • In Your Element: The A-Z of zirconium. Emsley, John // Nature Chemistry;Nov2014, Vol. 6 Issue 11, p1026 

    An abstract of the article "In Your Element: The A-Z of zirconium" by John Emsley is presented.

  • Heavily doped n-type PbSe and PbS nanocrystals using ground-state charge transfer from cobaltocene. Weon-kyu Koh; Koposov, Alexey Y.; Stewart, John T.; Pal, Bhola N.; Robel, Istvan; Pietryga, Jeffrey M.; Klimov, Victor I. // Scientific Reports;6/21/2013, p1 

    Colloidal nanocrystals (NCs) of lead chalcogenides are a promising class of tunable infrared materials for applications in devices such as photodetectors and solar cells. Such devices typically employ electronic materials in which charge carrier concentrations are manipulated through "doping;"...

  • Ab-initio Calculations Of The Electronic Properties of Silicon Nanocrystals: Absorption, Emission, Stokes Shift. Degoli, Elena; Cantele, G.; Luppi, Eleonora; Magri, Rita; Ossicini, Stefano; Ninno, D.; Bisi, O.; Onida, G.; Gatti, M.; Incze, A.; Pulci, O.; Del Sole, R. // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p859 

    The structural, optical and electronic properties of silicon nanocrystals are investigated as a function of the dimension as well as the surface passivation. Both the ground- and an excited-state configuration are studied using ab-initio calculations. Atom relaxation under excitation is taken...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics