  Polycrystalline samples of double perovskites Ba2BOsO6 (B = Sc, Y, In) were
synthesized by solid state reactions. They adopt the cubic double perovskite
structures (space group, Fm-3m) with ordered B and Os arrangements. Ba2BOsO6 (B
= Sc, Y, In) show antiferromagnetic transitions at 93 K, 69 K, and 28 K,
respectively. The Weiss-temperatures are -590 K for Ba2ScOsO6, -571 K for
Ba2YOsO6, and -155 K for Ba2InOsO6. Sc3+ and Y3+ have the open-shell d0
electronic configuration, while In3+ has the closed-shell d10. This indicates
that a d0 B-type cation induces stronger overall magnetic exchange interactions
in comparison to a d10. Comparison of Ba2BOsO6 (B = Sc, Y, In) to their Sr and
Ca analogues shows that the structural distortions weaken the overall magnetic
exchange interactions.
