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Evolution of structure and physical properties in Al-substituted Ba-hexaferrites

Chinese Physics B 2016年第1期25卷 706-711页

作者： Alex trukhanov Larisa Panina sergei trukhanov Vitalii Turchenko Mohamed Salem National University of Science and Technology MISiS 119049MoscowLeninsky Prospckt4Russia SSPA Scientific and Practical Materials Research Centre of NAS of Belarus 220072 RBMinsk19 P.Brovki Str.Russia Joint Institute for Nuclear Research 141980Dubna6 Joliot-Curie StreetRussia

The investigations of the crystal and magnetic structures of the BaFe12_xAlxO19 （x = 0.1-1.2） solid solutions have been performed with powder neutron diffractometry. Magnetic properties of the BaFe12_xAlxOt9 （x = 0.1-1.2） solid solutions have been measured by vibration sample magnetometry at different temperatures under different magnetic fields. The atomic coordinates and lattice parameters have been Rietveld refined. The invar effect is observed in low temperature range （from 4.2 K to 150 K）. It is explained by the thermal oscillation anharmonicity of atoms. The increase of microstress with decreasing temperature is found from Rietveld refinement. The Curie temperature and the change of total magnetic moment per formula unit are found for all compositions of the BaFet2_xAlxO19 （x = 0.1-1.2） solid solutions. The magnetic structure model is proposed. The most likely reasons and the mechanism of magnetic structure formation are discussed.

关键词： barium hexaferrites neutron diffraction crystal and magnetic structures

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Impact of In^(3+) cations on structure and electromagnetic state of M-type hexaferrites

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Journal of Energy Chemistry 2022年第6期31卷 667-676,I0018页

作者： Vitalii Alexandrovich Turchenko sergei Valentnovich trukhanov Vladmir Grigor'evich Kostishin Francua Damay Florance Porcher Denis Sergeevich Klygach Maxim Grigor'evich Vakhitov Lyudmila Yur'evna Matzui Olena Sergeevna Yakovenko Bernat Bozzo Ignasi Fina Munirah Abdullah Almessiere Yassine Slimani Abdulhadi Baykal Di Zhou Alex Valentinovich trukhanov Joint Institute for Nuclear Research 6 Joliot-Curie Str.Dubna 141980Russia South Ural State University 76Lenin Av.Chelyabinsk 454080Russia Donetsk Institute of Physics and Technology named after O.O.Galkin of the NASU 46 Nauki Av.Kiev 03680Ukraine SSPA“Scientific and Practical Materials Research Centre of NAS of Belarus” 19 P.Brovki str.Minsk 220072Belarus National University of Science and Technology“MISiS” Leninsky av.4Moscow 119049Russia Laboratoire Leon Brillouin UMR12 CEA-CNRSB̂at.563 CEA SaclayGif sur YvetteCedex 91191France Ural Federal University named after the First President of Russia B.N.Yeltsin Yekaterinburg 620002Russia Taras Shevchenko National University of Kyiv Volodymyrs’ka str.64/13Kyiv 01601Ukraine Institut de Ciencia de Materials de Barcelona-CSIC Campus de la UABBellaterraBarcelona 08193Spain Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam 31441Saudi Arabia Department of Nanomedicine Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam 31441Saudi Arabia Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi'an 710049ShannxiChina Department of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam 31441Saudi Arabia

The solid solutions of In^(3+) doped M-type strontium hexaferrites were produced using a conventional solid-state reaction method,and Rietveld analysis of the neutron diffraction patterns was ***^(3+) cations occupy octahedral (4f_(Ⅵ)and 12 k) and tetrahedral (4f_(Ⅳ)) positions (SG=P6_(3)/mmc(No.194)).The average particle size is 837–650 *** tempearature (T_(C)) of the compounds monotonically decreased down to~520 K with increasing x.A frustrated magnetic state was detected from ZFC and FC *** magnetization (M_(s)) and effective magnetocrystalline anisotropy coefficient (k_(eff)) were determined using the law of approach to saturation.A real permittivity (ε″) maximum of~3.3 at~45.5 GHz and an imaginary permittivity (ε′) of~1.6 at~42.3 GHz were observed for x=0.1.A real permeability (μ′) maximum of~1.5 at~36.2 GHz was observed for x=0.Aμ″imaginary permeability maximum of~0.8 at~38.3 GHz was observed for x=*** interpretation of the results is based on the type of dielectric polarization and the natural ferromagnetic resonance features.

关键词： Doped strontium hexaferrites Neutron powder diffraction Magnetic properties Permittivity Permeability

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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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