XIV Brazil MRS Meeting - Rio de Janeiro, from 27 September to 01 October, 2015

X-ray diffraction characterization of the of doped with rare earth.

Ana Regina de Queiroz Silva1, Ana Angélica Mathias Macêdo2, Cléber Cândido Silva1

1Universidade Federal do Maranhão, 2Instituto Federal de Educação, Ciência E Tecnologia do Maranhão

e-mail: [email protected]

Abstract

The (CaTiO3) is a perovskite structure material having polymorphism with cubic structure above the temperature 1580 K, tetragonal between 1380 and 1500 K and 1380 K orthorhombic below used in different applications. Rare earth cations are used to dope the perovskite in order to provoke changes in the behavior optical sensors, amplifiers, wave-guide, solid- state lighting and , as well as biological applications. The objective of this study was to synthesize and characterize a based CaTiO3 doped with rare +3 +3 earth cations (Er and Yb ). The synthesis of CaTiO3 was performed by calcining at 1100 ° C for 6 h and, after synthesis, was carried out with the doping (Er2O3 and Yb2O3). The calcium titanate was synthesized by the solid state method, calcined in funace and doped with concentration of 1% for Er+3 and co-doped with Yb+3 to 0.25%. The patterns of the samples were compared by X-ray diffraction (XRD). The CaTiO3 presented more intense peaks at 32° and 48° and the Ca0,987Er0,01Yb0,0025TiO3 exhibited peaks diffraction larger structural order.

With these results it is concluded that the rare earth Er2O3 and Yb2O3 added to

CaTiO3 even in low concentrations caused a shift in peak intensity.

Acknowledgements

The authors acknowledge the financial support of CAPES, CNPq and FAPEMA institution research.

References

EDUARDO, A. C.; FIGUEIREDO, A.T.; LI, M. S.; LONGO, E. Structural disorder-

1181 XIV Brazil MRS Meeting - Rio de Janeiro, from 27 September to 01 October, 2015

dependent upconversion in Er3+/Yb3+ doped calcium titanate. International, vol. 40, p.15981–15984, 2014. MANIK, S.K.; PRADHAN, S.K. Microstructure characterization of ball milled prepared nanocrystalline perovskite CaTiO3 by Rietveld method.Materials Chemistry and Physics, vol.86, p.284-292, 2004.

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