| Preparation, Characterization, Photocatalytic Activity and
Conductivity Studies of YLnTi2O7 (Ln = Nd, Sm, Eu and Gd) |
V. Rama Devi, G. Ravi, Radha Velchuri, N. R. Muniratnam1, G. Prasad2 and M. Vithal*
pages : 241-251
DOI : 10.1080/0371750X.2013.867644 |
| Abstract |
| Bulk and nano sized oxides belonging to pyrochlore family of composition YLnTi2O7 (Ln = Nd, Sm, Eu and Gd) have
been prepared by sol-gel method. The as-prepared gel ‘precursor’ was sintered at different temperatures in the
range 675o-900oC. All the materials were characterized by TGA-DTA, powder XRD, Raman, EDS, XPS and UV-Visible
diffuse reflectance spectra. The crystallization of all the materials got started around 700oC. All these oxides were
crystallized in ordered pyrochlore lattice with Fd3m space group. The average crystallite size calculated from the
FWHM of intense XRD line was in the range 25-50 nm. The vibrational modes observed from Raman spectroscopy
also support ordered pyrochlore structure for these oxides. The photocatalytic activities of all the nano powders
were evaluated by photodegradation of methylene blue under visible light irradiation. The DC conductivity of all
these materials was carried out in the temperature range 180o-560oC and discussed. |
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