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A-site ordered state in manganites with perovskite-like structure based on optimally doped compounds Ln0.70Ba0.30MnO3（Ln=Pr,Nd）

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Journal of Rare Earths 2019年第11期37卷 1242-1249页

作者： S.v.trukhanov vA Khomchenko D.v.Karpinsky M.v.Silibin a.v.trukhanov L.S.Lobanovsky H.Szymczak C.E.Botez I.O.Troyanchuk National University of Science and Technology MISiS 119049 MoscowLeninsky Av.4Russia South Ural State University 454080 ChelyabinskLenin Av.76Russia Scientific-Practical Materials Research Centre of NASB 220072 MinskBelarus CFisUC Department of PhysicsUniversity of Coimbra3004-516 CoimbraPortugal National Research University of Electronic Technology"MIET 124498 ZelenogradMoscowRussia Institute for Bionic Technologies and Engineering I.M.Sechenov First Moscow State Medical University2-4 Bolshaya Pirogovskaya St.119991 MoscowRussia Institute of Physics Polish Academy of Sciences02-668 WarsawPoland The University of Texas at El Paso El PasoTX 79968-0515USA

In this paper,we report on the crystal structure and magnetic properties of the nano structured Baordered phases of rare-earth manganites obtained from the optimally doped solid solutions Ln0.70Ba0.30MnO3(Ln=Pr,Nd).The materials were studied by X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy and SQUID-magnetometry *** is found that states with different degrees of cation ordering in the A-sublattice of the ABO3 perovskite can be obtained by employing special conditions of chemical *** particular,reduction of the parent compounds results in the formation of a nanocomposite containing ferrimagnetic anion-deficient ordered phase *** of the composite does not change an average size of the nanocrystallites,but drastically alters their phase composition to stabilize ferromagnetic stoichiometric ordered phase LnBaMn2O6 and ferromagnetic superstoichiometric disordered phase Ln0.90Ba0.10MnO3+δ.It is shown that the magnetic properties of the materials are determined by the joint action of chemical(cation ordering)and external(surface tension)pressures.

关键词： Ionic order Magnetic transition Perovskite Manganite Rare earths

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Effect of the Oxygen Content on Magnetic Ordering in the Optimal Sr-Doped Anion-Deficient Manganites

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材料科学与工程（中英文版） 2010年第3期4卷 62-68页

作者： Sergei v. trukhanov Alexey v. trukhanov Alexander N. vasil＇ev Anatoliy I. Beskrovniy Henryk Szymczak Scientific-Practical Materials Research Centre of NAS of Belarus Minsk 220072 Belarus Department of Low-Temperature Physics and Superconductivity Moscow State University Moscow 119899 Russia Joint Institute for Nuclear Research Moscow 141980 Russia Institute of Physics of PAS Warsaw 02-668 Poland

The crystal and magnetic structure of solid solutions La0.70Sr0.30MnO3-γ has been investigated by neutron diffraction at different temperatures. Found that the magnetic structure varies depending on the concentration of oxygen vacancies. These data confirm the theory of the formation of the magnetic phase state in Sr-substituted anion-deficient manganites, whereby in the absence of orbital ordering reduction in coordination of magnetic ions leads to a change in sign of the indirect superexchange interactions Mn3+-O-Mn3+. We discuss the most probable mechanism of formation of the magnetic ordering in Sr-substituted anion-deficient manganites.

关键词：锰氧化物阴离子磁性锶掺杂氧含量订购交换相互作用中子衍射

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