Influence of Mn3+ ions on ordering in magnetic oxides

A strong effort of the Mn3+(d(4)) ions to remove their orbitally degenerate d ground state is a motivating power to lower the symmetry of their surroun dings. Besides this tendency the real effect depends also on a number of ad ditional contributions, above all the fundamental structural matrix and com positional influences. They are analyzed on examples of three structural ty pes derived from the close packed arrangement of oxygen anions, namely spin el, magnetoplumbite and Perovskite structures. (C) 2000 Elsevier Science Lt d. All rights reserved.