Structural, hyperfine, and magnetic properties of R2FeTaO7 compounds (R=Y, Dy, Gd, and Eu)

MATSUDA C. K.; IVASHITA F. F.; PAESANO J. A.; E. V. PANNUNZIO MINER; BLANCO M. C.; CARBONIO R. E; MARIMON DA CUNHA J. B.; GHIVELDER L.

American Physical Society

Lugar: Washington; Año: 2010 vol. 81 p. 144171 - 144171

yrochlore-related compounds of the R2FeTaO7 type with R=Gd, Eu, Dy, and Y were synthesized by solid-state reaction of precursor oxides. The compounds were structurally and magnetically characterized by x-ray diffraction, Mössbauer spectroscopy, and magnetic measurements. The results revealed that this subfamily of pyrochlores crystallizes with the R3 symmetry, where iron with tantalum occupies two different crystallographic sites. Magnetic phase transition to a long-range ordered state was not observed down to 2 K,although islands of magnetically oriented iron atoms could be detected.