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Bulletin of the Chemical Society of Japan
Vol. 84 (2011) No. 7 P 802-806

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http://doi.org/10.1246/bcsj.20100335

 

Structural stability of A-site-ordered perovskites AMn3Al4O12 was evaluated by the global instability index calculated from the SPuDS program. Based on the results, we “designed” new compounds AMn3Al4O12 (A = Y, Yb, and Dy), and these compounds were synthesized with a high-pressure technique. The obtained compounds were ionic crystals, A3+Mn3+3Al3+4O2−12, with fourfold square-planar coordination for Mn3+ at the originally twelvefold-coordinated A site of the ABO3 simple perovskite structure. Structural parameters obtained from the structure refinement well agreed with the “predicted” values. The synthesized compounds contained magnetic Mn3+ ions with S = 2 spins at the A′ site, and the A′–A′ interaction resulted in antiferromagnetic ordering of the Mn3+ spins at temperatures ranging from 29 to 40 K. The Yb3+/Dy3+ moments in (Yb/Dy)Mn3Al4O12 were found to be paramagnetic even below the antiferromagnetic transition temperatures.

Copyright © 2011 The Chemical Society of Japan

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