Structural, Hyperfine and Magnetic Properties of RE2FeTaO7 (RE = Y; Dy; Gd; Eu) Compounds

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

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: Argonne; Año: 2010 vol. 81 p. 14417 - 14423

1098-0121

Pyrochlore-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.