State of Chromium in Solid Solutions of Complex Bismuth Niobates Bi_2BaCr_xNb_(2-x)O_9(0.01 < x < 0.3)

摘要

Magnetic susceptibility and electric properties of complex bismuth niobates with the layered perovskite structure,containing chromium(III)atoms in niobium(V)sites,were studied.Clusters of chro-mium(III)atoms with a high antiferromagnetic exchange parameter(-45 cm~(-1))were found,whose formation along the c axis of the structure is associated with the presence of vacancies in the oxygen sublattice.