TAILIEUCHUNG - Structure of span 80 activated double perovskite system La2Co1-xFexMnO6 (x = 0.00, 0.01, 0.02, 0.03)

We report the structure and the magnetic behaviors of the Fe-doped La2Co1-xFexMnO6 family of compounds at low doping concentrations x ≤ 3 %. The substitution of Fe into the Co site induced the increase in ferromagnetism at the cost of TC. The small doping of Fe in La2Co1-xFexMnO6 (≤ 3 %) led to the slight changes in the lattice constants but the symmetry of the lattice remained unchanged (Pnma). The doping also reduced TC for both transitions at around 215 K and 130 K which attribute for the different spin orderings of the magnetic ions. | Journal of Science and Technology 54 (5A) (2016) 185-190 STRUCTURE OF SPAN-80 ACTIVATED DOUBLE PEROVSKITE SYSTEM La2Co1-xFexMnO6 (x = , , , ) Pham The Tan1, *, Chu Van Tuan1, Pham Duc Huyen Yen2 1 2 Faculty of basic science, Hung Yen University of Technology and Education, Dan Tien, Khoai Chau, Hung Yen, Viet Nam Faculty of Technical Physics and Nanotechnology, VNU-University of Engineering and Technology, 144 Xuan Thuy, Cau Giay, Ha Noi, Viet Nam. * Email: phamthetansp@ Received: 15 July, 2016; Accepted for publication: 3 December, 2016 ABSTRACT We report the structure and the magnetic behaviors of the Fe-doped La2Co1-xFexMnO6 family of compounds at low doping concentrations x ≤ 3 %. The substitution of Fe into the Co site induced the increase in ferromagnetism at the cost of TC. The small doping of Fe in La2Co1-xFexMnO6 (≤ 3 %) led to the slight changes in the lattice constants but the symmetry of the lattice remained unchanged (Pnma). The doping also reduced TC for both transitions at around 215 K and 130 K which attribute for the different spin orderings of the magnetic ions. Keywords: double perovskite, structure. 1. INTRODUCTION In the traditional ceramic method, usually called solid state reaction, the metal oxide compounds are synthesized from grinding metal oxides or salts together, then samples are pressed and sintered. This process is repeated over and over again for many times to achieve the homogeneous samples. The solid state reaction occurs when the powder compounds are sintered at high temperature, approximately of 2/3 melting point. At this point, the reaction rate is still low until when particles are in closer contact. To have the balance of solid state reaction, the high sintered temperature and longer sintering time is needed. The main disadvantage of this method is that the homogeneity of final product is not high. So the sol-gel method was used; by this method, the compounds are mixed in atomic size. Sol-gel .

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