Modulation the structural, magnetic and electrical properties of Ni-Zn ferrites by lutetium substitution

摘要

Ni-Zn ferrites with a formula of Ni_(0.5)Zn_(0.5)Lu_xFe_(2-x)O_4 (x = 0.000, 0.004, 0.008, 0.012, 0.016 and 0.020) have been synthesized by ceramic sintering method. The effects of Lu~(3+) doping on structural, electrical and magnetic performances are investigated. X-ray powder diffraction results demonstrate that Lu~(3+) ions completely enter into the lattice of cubic spinel structure without formation impurity phases. By increasing Lu~(3+) content, the lattice parameter increases monotonously. The average crystallite size D and microstrain for all samples are estimated by Williamson-Hall (W-H) method. Fourier transform infrared spectroscopy (FTIR) and energy dispersive spectra (EDS) analyses confirm the cubic spinel phase and chemical composition of the as-synthesized Ni_(0.5)Zn_(0.5)Lu_xFe_(2-x)O_4, respectively. Scanning electron microscope (SEM) images indicate that the size of agglomerated particles is not uniform with a little bit of pores, and the grain boundaries become more ambiguous as increasing Lu~(3+) content. The permittivity indicates a normal dielectric behavior of Ni-Zn ferrites under the alternating electric field. However, when the frequency of applied electric field reaches a certain value, the dielectric loss tangent will appear a peak behavior. The typical ferromagnetic S-shape loops of these samples were collected by vibrating sample magnetometer (VSM), the saturation magnetization first increases and then decreases with increasing Lu~(3+) concentration, exhibiting a maximum value of 71.41 emu/g when x = 0.004.Please check and confirm the author names and initials are correct. Also, kindly confirm the details in the metadata are correct.The author names and initials are checked and corrected accordingly. The details in the metadata are correct.