Structural and magnetic characterization of the double perovskites R2NiRuO6 (R = Pr-Er): A neutron diffraction study. (March 2017)

• Record Type: Journal Article
• Authors: Kayser, P.; Alonso, J.A.; Muñoz, A.; Fernández-Díaz, M.T.
• Is Part Of: Acta materialia. Volume 126(2017)
• Page Start: 114
• Page End: 123
• Publication Date: 2017-03
• Subjects: Ruthenium -- Double perovskite -- 4d transition metal -- Neutron powder diffraction -- La2NiRuO6 -- Pr2NiRuO6 -- Nd2NiRuO6 -- Tb2NiRuO6 -- Dy2NiRuO6 -- Y2NiRuO6 -- Ho2NiRuO6 -- Er2NiRuO6; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2016.12.024
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Novel members of the R2 NiRuO6 family of double perovskites have been prepared via a nitrate-citrate route, followed by annealing treatments in air in the 1100-1300 °C temperature range. The crystal and magnetic structures were characterized from neutron powder diffraction (NPD) data at 300 K and 2 K. All the samples are monoclinic, P21 /n space group, with a √2 a 0 × √2 a 0 × 2 a 0 unit-cell, compared to the simple perovskite a 0 edge. Ni 2+ and Ru 4+ ions occupy distinct octahedral positions, with a certain antisite disordering. The magnetic structures are defined by the propagation vector k = 0. The magnetic moments of the Ni 2+ cations are antiparallel to the spins of the Ru 4+ sublattice; the structure can be described as ferromagnetic [011] layers antiferromagnetically (AFM) coupled to each other. For R = Ho and Er perovskites, the rare-earth moments participate in the magnetic structure: Ho 3+ cations are ordered along the direction (010) in alternate planes AFM coupled and the magnetic moments of Er 3+ are ferromagnetically ordered along the c axis. Graphical abstract: The establishment of charge ordering between Ni 2+ and Ru 4+ ions dramatically changes the physical properties of the parent perovskites RNiO3 . Image 1