Preparation and crystallographic data of the pyrochlores Gd2MSbO7 (M = Cr,Mn, Fe,In)

Polycrystalline Gd₂MSbO₇ (M =Cr,Mn,Fe,In) have been prepared from M₂O₃ (M = Cr, Fe, In), Mn metal and Sb₂O₃ at different temperatures above 1470 K. Gd₂MSbO₇ (M = Cr, Mn,Fe,In) are cubic, pyrochlore-type compounds, space group Fd3̄m (No. 227), Z = 8, a values varying from 10.266 (1) (M = Cr) to 10.486 (1) Å (M = In). For Gd in 16(c), M and Sb at random in 16(d) sites, oxygen atoms in 8(a) and 48(?) positions and x, oxygen positional parameter, equal to 0.412 (M = In) up to 0.425 (M = Mn), origin at center (3̄m), R values from 0.032 (M = In) to 0.041 (M = Mn) are obtained. X-ray powder diffraction data and interatomic distances are given.