Effect of High Pressure on local structure of pure and Co-doped tin dioxide nanoparticles

F. GRINBLAT; S. FERRARI; L. G. PAMPILLO; V. BILOVOL

Campinas

Simposio; XV B-MRS program; 2016

Co0.05Sn0.95O2 nanoparticles with rutile structure were studied by means of High Pressure X-Ray Absorption technique (HP-XAS) with synchrotron radiation and Diamond Anvil Cell (DAC). HP-XAS experiments were performed on the Sn K-edge in Laboratorio Nacional de Luz Sincrotrón (LNLS), Campinas. Experiments were performed from ambient pressure and up to 12 GPa, with a fixed temperature of 120K. Results were compared with previous studies on pure SnO2 nanoparticles by means of High Pressure X-Ray Diffraction (HP-XRD) experiments at room temperature performed in the ALBA synchrotron from Barcelona. Both samples were synthesized by the co-precipitation method. Sn-O distance in the rutile structure of bulk SnO2 decreases with pressure with a linear fit. We observed the same behaviour in our Co0.05Sn0.95O2 nanoparticles studied by HP-XAS. Moreover, comparing these results with the Sn-O distances on pure SnO2 nanoparticles studied by HP-XRD, we found the same slope in both cases. Our results could imply that Co incorporation on SnO2 nanoparticles does not significantly affect its compressibility within the limits of assessments of the experimental techniques used in this work. From this it could be concluded that doping SnO2 nanoparticles with 5% of Co does not change bulk modulus and other mechanical properties of SnO2 nanoparticles up to 12 GPa.