Recent study of nanomaterials prepared by inert gas condensation using ultra high vacuum chamber

S. Ramasamy, David Smith, P. Thangadurai, K. Ravichandran, T. Prakash, K. Padmaprasad, V. Sabarinathan

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The ultra high vacuum chamber was developed in the Department of Nuclear Physics, University of Madras with the funding from DST, India. This UHV chamber is used to prepare nanocrystalline materials by inert gas condensation technique (IGCT). Nanocrystalline materials such as PbF2, Mn 2+-doped PbF2, Sn-doped In2O3 (ITO), ZnO, Al2O3, Ag2O, CdO, CuO, ZnSe:ZnO etc., were prepared by this technique and characterized. Results of some of these materials will be presented in this paper. In solid-state 207Pb NMR on PbF2 a separate signal due to the presence of grain boundary has been observed. The structural phase transition pressure during the phase transformation from the cubic phase to orthorhombic phase under high pressure shows an increase with the decrease in grain size. Presence of electronic centres in nanocrystalline PbF2 is observed from Raman studies and the same has been confirmed by photoluminescence studies. Al2O 3 was prepared and 56Fe ions were implanted. After implantation segregation of 56Fe ions was examined by SEM. The oxidation properties of ITO were studied by HRTEM. As against the expectation of oxide coating on individual nanograins of In-Sn alloy, ITO nanograins grew into faceted nanograins on heat treatment in air and O2 atmosphere. The growth of ITO under O2 atmosphere showed pentagon symmetry. The PMN was initially prepared by solid-state reaction. Further, this PMN relaxor material will be used to convert into nanocrystalline PMN by IGCT with sputtering and will be studied.

Original languageEnglish (US)
Pages (from-to)881-891
Number of pages11
JournalPramana - Journal of Physics
Volume65
Issue number5
DOIs
StatePublished - Nov 1 2005

Keywords

  • Copper oxide
  • High resolution transmission electron microscopy
  • Indium tin oxide
  • Inert gas condensation technique
  • Lead fluoride
  • Mn-doped lead fluoride
  • Nanocrystalline materials
  • PMN-PT
  • Tin oxide
  • Ultra high vacuum chamber
  • Zinc oxide

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Ramasamy, S., Smith, D., Thangadurai, P., Ravichandran, K., Prakash, T., Padmaprasad, K., & Sabarinathan, V. (2005). Recent study of nanomaterials prepared by inert gas condensation using ultra high vacuum chamber. Pramana - Journal of Physics, 65(5), 881-891. https://doi.org/10.1007/BF02704088