Author/Authors :
Nayak، نويسنده , , George C. and Nigam، نويسنده , , Sandeep and Pandey، نويسنده , , M. and Sudarsan، نويسنده , , V. and Majumder، نويسنده , , Jules C. and Jha، نويسنده , , S.N. and Bhatacharyya، نويسنده , , D. K. Vatsa، نويسنده , , R.K. and Kshirsagar، نويسنده , , R.J.، نويسنده ,
Abstract :
Nature of bonding around Y3+ and Sn4+ ions in Y2Sn2O7 phase, both in the bulk and in nanosize dimensions, were investigated by yttrium K edge EXAFS measurement, Raman spectroscopy and theoretical calculations based on density functional theory (DFT). From the investigations it is established that Y–O bond is more covalent in nanoparticles of Y2Sn2O7, compared to bulk Y2Sn2O7. Asymmetric electron density distribution around Sn4+ in nanoparticles of Y2Sn2O7, compared to bulk, leads to the improvement in the Raman activities of bending and stretching vibrational modes of Y–O, Y–O–Sn and Sn–O linkages.
