TY - JOUR
T1 - Recent study of nanomaterials prepared by inert gas condensation using ultra high vacuum chamber
AU - Ramasamy, S.
AU - Smith, David
AU - Thangadurai, P.
AU - Ravichandran, K.
AU - Prakash, T.
AU - Padmaprasad, K.
AU - Sabarinathan, V.
N1 - Funding Information:
This work is supported by DST, India (Scheme No. SR/S5/NM-58/2002) and it is gratefully acknowledged. The authors thank J Weismueller, K Foester and G Wilde of the Institute of Nanotechnology, Karlsruhe, Germany for SAXS and DSC measurements. One of the authors PT thanks the CSIR, India for the SRF award.
PY - 2005/11
Y1 - 2005/11
N2 - 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.
AB - 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.
KW - Copper oxide
KW - High resolution transmission electron microscopy
KW - Indium tin oxide
KW - Inert gas condensation technique
KW - Lead fluoride
KW - Mn-doped lead fluoride
KW - Nanocrystalline materials
KW - PMN-PT
KW - Tin oxide
KW - Ultra high vacuum chamber
KW - Zinc oxide
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U2 - 10.1007/BF02704088
DO - 10.1007/BF02704088
M3 - Article
AN - SCOPUS:30844451255
SN - 0304-4289
VL - 65
SP - 881
EP - 891
JO - Pramana - Journal of Physics
JF - Pramana - Journal of Physics
IS - 5
ER -