%0 Journal Article
%A Gómez-Pérez, Alejandro
%A Prado Gonjal, Jesús de la Paz
%A Muñoz Gil, Daniel
%A Andrada Chacón, Adrián
%A Sánchez Benítez, Francisco Javier
%A Morán Miguélez, Emilio
%A Azcondo, MaríaTeresa
%A Amador, Ulises
%A Schmidt, Rainer
%T Anti-site disorder and physical properties in microwave synthesized RE2Ti2O7 (RE = Gd, Ho) pyrochlores
%D 2015
%U https://hdl.handle.net/20.500.14352/94361
%X In this work we report on the microwave assisted synthesis of nano-sized Gd2Ti2O7 (GTO) and Ho2Ti2O7 (HTO) powders from the RE2Ti2O7 pyrochlore family (RE ¼ rare earth). Synchrotron X-ray powder diffraction was used to study RE–Ti cationic anti-site defects with concentrations that decrease in both samples with increasing temperature starting from 1100  C, and the defects disappear at 1400 ºC. SQUID magnetometry measurements revealed that GTO shows a predominantly anti-ferromagnetic structure, whereas HTO exhibits magnetic saturation and a ferromagnetic component at low temperature. Impedance spectroscopy data revealed strongly increased ionic oxygen vacancy conduction in HTO ceramic pellets as compared to GTO, which may be associated with a higher degree of oxygen vacancy disorder. This argument was supported by Raman spectroscopy data.
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