Preparation, crystal structure and magnetic behavior of new double perovskites Sr2B?UO6 with B? = Mn, Fe, Ni, Zn

R. M. PINACCA; M. C. VIOLA; J. C. PEDREGOSA; M. J. MARTÍNEZ-LOPE; R. E. CARBONIO; J. A. ALONSO

Elsevier

Año: 2007 vol. 180 p. 1582 - 1582

span lang="en" style="font-family: "Arial","sans-serif"; font-size: 12pt;">Sr2B´UO6 double perovskites with B´ = Mn, Fe, Ni, Zn have been prepared in polycrystalline form by solid-state reaction, in air or reducing conditions. These new materials have been studied by X-ray diffraction (XRD), magnetic susceptibility and magnetization measurements. The room-temperature crystal structure is monoclinic (space group P21/n), and contains alternating B´O6 and UO6 octahedra sharing corners, tilted along the three pseudocubic axes according to the Glazer notation a-a-b+. The magnetic measurements show a spontaneous magnetic ordering below TN = 21 K for B´ = Mn, Ni, and TC = 150 K for B´ = Fe. From a Curie-Weiss fit, the effective paramagnetic moment for B´ = Mn (5.74 m