Drastic Change of Magnetic Interactions and Hysteresis
through Site-Preferential Ru/Ir Substitution in Sc<sub>2</sub>FeRu<sub>5–<i>x</i></sub>Ir<sub><i>x</i></sub>B<sub>2</sub>
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Abstract
The
quinary members of the complex boride series Sc<sub>2</sub>FeRu<sub>5–<i>x</i></sub>Ir<sub><i>x</i></sub>B<sub>2</sub> were synthesized by arc melting the elements
and characterized by powder and single-crystal X-ray diffraction as
well as metallographic and energy-dispersive X-ray analyses. The use
of a 4d/5d mixture allows distinguishing these elements with X-ray
diffraction methods, thus enabling the study of site preference and
its influence on the magnetic properties.The magnetic measurements
reveal several changes of magnetic ordering
within the series: from antiferromagnetism (Sc<sub>2</sub>FeRu<sub>5</sub>B<sub>2</sub>) to ferromagnetism (Sc<sub>2</sub>FeRuIr<sub>4</sub>B<sub>2</sub>) and finally to metamagnetism (Sc<sub>2</sub>FeIr<sub>5</sub>B<sub>2</sub>). Within the quinary series, the magnetic
moments continuously increase with increasing amounts of Ir in one
(8<i>j</i>) of two possible Wyckoff sites. The members with <i>x</i> = 2 and 3 represent the first hard magnetic borides of
transition metals
