Stuffed Rare Earth Pyrochlore Solid Solutions

Details Stuffed Rare Earth Pyrochlore Solid Solutions Stuffed Rare Earth Pyrochlore Solid Solutions

2006-03-28

arxiv.org/abs/cond-mat/0603735v1

J. Sol. St. Chem. 179 (2006), 3126-3135

Physics

Condensed Matter

Strongly Correlated Electrons

25 pages, 7 figures, submitted to J. Solid State Chem

Scientific paper

10.1016/j.jssc.2006.06.007

Synthesis and crystal structures are described for the compounds Ln2(Ti2-xLnx)O7-x/2, where Ln = Tb, Dy, Ho, Er, Tm, Yb, Lu, and x ranges from 0 to 0.67. Rietveld refinements on X-ray powder diffraction data indicate that in Tb and Dy titanate pyrochlores, extra Ln3+ cations mix mainly on the Ti4+ site with little disorder on the original Ln3+ site. For the smaller rare earths (Ho-Lu), stuffing additional lanthanide ions results in a pyrochlore to defect fluorite transition, where the Ln3+ and Ti4+ ions become completely randomized at the maximum (x=0.67). In all of these Ln-Ti-O pyrochlores, the addition of magnetic Ln3+ in place of nonmagnetic Ti4+ adds edge sharing tetrahedral spin interactions to a normally corner sharing tetrahedral network of spins. The increase in spin connectivity in this family of solid solutions represents a new avenue for investigating geometrical magnetic frustration in the rare earth titanate pyrochlores.

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