Structure, Magnetic, and Electric Properties of Bismuth Niobates Doped with d-Elements: IX. State of Nickel in the Bi2BaNi_xNb_(2-x)O_(9-δ) Solid Solutions with Layered Perovskite-Like Structure

摘要

The study of magnetic susceptibility of the Bi2BaNi_xNb_(2-x)O_(9-δ) solid solutions has shown that paramagnetic nickel atoms are present in diluted solutions as exchange-bound dimers formed by Ni(III) atoms in the high-spin state and characterized by the exchange parameter J of 12 cm~(-1) . As the concentration of the solid solutions increases, clusters consisting of pairs of ferromagnetic Ni(III) dimers with antiferromagnetic exchange type and J = -170 cm~(-1) are formed.