Anti-site disorder and physical properties in microwave synthesized RE2Ti2O7 (RE = Gd, Ho) pyrochlores

Gómez-Pérez, Alejandro; Prado Gonjal, Jesús De La Paz; Muñoz Gil, Daniel; Andrada Chacón, Adrián; Sánchez Benítez, Francisco Javier; Morán Miguélez, Emilio; Azcondo, MaríaTeresa; Amador, Ulises; Schmidt, Rainer

Anti-site disorder and physical properties in microwave synthesized RE2Ti2O7 (RE = Gd, Ho) pyrochlores

Official URL

https://doi.org/10.1039/C5RA07796F

Publication date

2015

Authors

Gómez-Pérez, Alejandro

Prado Gonjal, Jesús De La Paz

Muñoz Gil, Daniel

Andrada Chacón, Adrián

Sánchez Benítez, Francisco Javier

Morán Miguélez, Emilio

Azcondo, MaríaTeresa

Amador, Ulises

Schmidt, Rainer

Publisher

Royal Society of Chemistry

Citations

Exportar

URI

https://hdl.handle.net/20.500.14352/94361

Citation

Gómez-Pérez, Alejandro, et al. «Anti-Site Disorder and Physical Properties in Microwave Synthesized RE 2 Ti 2 O 7 (RE = Gd, Ho) Pyrochlores». RSC Advances, vol. 5, n.o 104, 2015, pp. 85229-41. https://doi.org/10.1039/C5RA07796F.

Abstract

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.