Influence of mechanical activation on crystal structure and physical properties of YbFeO3

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2022-12, Vol.128 (12), Article 1075
• Main Authors: Li, Zhengyou, Abdulvakhidov, Kamaludin, Abdulvakhidov, Bashir, Soldatov, Alexander, Nazarenko, Alexander, Plyaka, Pavel, Manukyan, Aram, Angadi, V. Jagadeesha, Shapovalova, Svetlana, Sirota, Marina, Vitchenko, Marina, Mardasova, Irina, Ubushaeva, Elza, Kallaev, Suleiman, Omarov, Zairbek
• Format: Article
• Language: English
• Subjects: Applied physics; Bridgman method; Characterization and Evaluation of Materials; Coherent scattering; Condensed Matter Physics; Crystal defects; Crystal growth; Crystal structure; Crystallites; Dislocation density; Electron paramagnetic resonance; Machines; Magnetic saturation; Magnetization curves; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Physical properties; Physics; Physics and Astronomy; Processes; Shear deformation; Surfaces and Interfaces; Thin Films; Unit cell
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-022-06235-z

In this work, the influence of simultaneous action of high pressure and shear deformation (mechanical activation) on the physical properties of synthesized YbFeO 3 was studied using complex methods. The formation of crystalline structures of YbFeO 3 powders with different concentrations of structural defects was carried out using Bridgman anvils. It was found that during mechanical activation, the tilting angles of FeO 6 oxygen octahedra change within the range θ = 12.69–28.45°. Using X-ray diffraction, it was established that the linear unit cell parameters a , b and c change in a consistent manner with changing mechanical activation pressure, while the space-group symmetry D 2 h 16 – Pbnm is preserved. The sizes of the coherent scattering regions ( D ) decrease by more than 90% at the maximum mechanical activation pressure (1200 MPa). It was found that the mechanical activation pressures of YbFeO 3 have a threshold value (800 MPa), above which the dislocation density decreases. According to the results of impedance spectroscopy, the nature of relaxation was found to be non-Debye and the activation energy increased from 0.649 eV for the starting sample to 1.395 eV for the sample mechanically activated sample at 1 GPa. The magnetization curves M ( H ) were described using the law of approach to magnetic saturation (LAS), and the critical crystallite size ( D cr ) was determined to be 50 nm, at which the maximum H c is observed. The behaviors of the spectroscopic splitting factor ( g ) and half-width (Δ H ) of the electron paramagnetic resonance (EPR) spectrum are analogous to H c and M r , however, the maximum Δ H is observed in the range of 50–105 nm, and the g -factor reaches its maximum at particle sizes of 105 nm.