A-site cation size effect on structure and magnetic properties of Sm(Eu,Gd)Cr0.2Mn0.2Fe0.2CO0.2Ni0.2O3 high-entropy solid solutions


Vinnik D.A. Zhivulin V.E. Trofimov E.A. Gudkova S.A. Punda A.Yu. Valiulina A.N. Gavrilyak M. Zaitseva O.V. Taskaev S.V. Khandaker M.U. Alqahtani A. Bradley D.A. Sayyed M.I. Turchenko V.A. Trukhanov A.V. Trukhanov S.V.
January-1 2022MDPI

Nanomaterials
2022#12Issue 1

Three high-entropy Sm(Eu,Gd)Cr0.2Mn0.2Fe0.2Co0.2Ni0.2O3 perovskite solid solutions were synthesized using the usual ceramic technology. The XRD investigation at room temperature es-tablished a single-phase perovskite product. The Rietveld refinement with the FullProf computer program in the frame of the orthorhombic Pnma (No 62) space group was realized. Along with a decrease in the V unit cell volume from ~224.33 Å3 for the Sm-based sample down to ~221.52 Å3 for the Gd-based sample, an opposite tendency was observed for the unit cell parameters as the ordinal number of the rare-earth cation increased. The average grain size was in the range of 5–8 µm. Field magnetization was measured up to 30 kOe at 50 K and 300 K. The law of approach to saturation was used to determine the Ms spontaneous magnetization that nonlinearly increased from ~1.89 emu/g (Sm) up to ~17.49 emu/g (Gd) and from ~0.59 emu/g (Sm) up to ~3.16 emu/g (Gd) at 50 K and 300 K, respectively. The Mr residual magnetization and Hc coercive force were also determined, while the SQR loop squareness, k magnetic crystallographic anisotropy coefficient, and Ha anisotropy field were calculated. Temperature magnetization was measured in a field of 30 kOe. ZFC and FC magnetization curves were fixed in a field of 100 Oe. It was discovered that the Tmo magnetic ordering temperature downward-curve decreased from ~137.98 K (Sm) down to ~133.99 K (Gd). The spin glass state with ferromagnetic nanoinclusions for all the samples was observed. The average and Dmax maximum diameter of ferromagnetic nanoinclusions were calculated and they were in the range of 40–50 nm and 160–180 nm, respectively. The mechanism of magnetic state formation is discussed in terms of the effects of the A-site cation size and B-site poly-substitution on the indirect superexchange interactions.

Crystal structure , High entropy perovskites , Indirect superexchange interactions , Magnetic properties , Transition metals

Text of the article Перейти на текст статьи

Laboratory of Single Crystal Growth, South Ural State University, 76, Lenin Av., Chelyabinsk, 454080, Russian Federation
Centre for Applied Physics and Radiation Technologies, School of Engineering and Technology, Sunway University, Selangor, Bandar Sunway, 47500, Malaysia
Department of Basic Sciences, Deanship of Preparatory Year and Supporting Studies, Department of Nuclear Medicine Research, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam, 34212, Saudi Arabia
Centre for Nuclear and Radiation Physics, Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
Department of Physics, Faculty of Science, Isra University, Amman, 11622, Jordan
Department of Nuclear Medicine Research, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, Dammam, 31441, Saudi Arabia
Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6, Joliot-Curie Str., Dubna, 141980, Russian Federation
Donetsk Institute of Physics and Technology Named after O.O. Galkin of the NASU, 46, Nauki Av., Kiev, 03680, Ukraine
Laboratory of Magnetic Films Physics, SSPA “Scientific and Practical Materials Research Centre of NAS of Belarus”, 19, P. Brovki str., Minsk, 220072, Belarus
L.N. Gumilyov Eurasian National University, 2, Satpayev str., Nur-Sultan, 010000, Kazakhstan

Laboratory of Single Crystal Growth
Centre for Applied Physics and Radiation Technologies
Department of Basic Sciences
Centre for Nuclear and Radiation Physics
Department of Physics
Department of Nuclear Medicine Research
Laboratory of Neutron Physics
Donetsk Institute of Physics and Technology Named after O.O. Galkin of the NASU
Laboratory of Magnetic Films Physics
L.N. Gumilyov Eurasian National University

10 лет помогаем публиковать статьи Международный издатель

Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026