Magnetic transition behavior and electromagnetic properties of Zr substituted Bi0.5Y1.5−xCa1+xZrxV0.5Fe4.5−xO12 garnets

Zr substituted Bi0.5Y1.5−xCa1+xZrxV0.5Fe4.5−xO12 (x = 0.00, 0.25, 0.50, 0.75, 1.00) samples were prepared via solid-state reaction method. The structure, morphology, electromagnetic properties of Zr-doped Bi0.5Y1.5−xCa1+xZrxV0.5Fe4.5−xO12 were investigated by SEM, XRD, FT-IR, Raman, VSM, impedance analyzer, and vector network analyzer. The results showed that the Zr4+ and Ca2+ ions successfully entered the octahedral a-sites and dodecahedral c-sites, respectively. The saturation magnetization increased with the increase of doping concentration in low concentration range. However, the excessive dopant of diamagnetic Zr4+ ions resulted in a decrease in the saturation magnetization, indicating that the crystal lattice appeared short-range antiferromagnetic order at the d-sites, and the samples changed from ferromagnetism to paramagnetism. Among them, Bi0.5Y1.25Ca1.25Zr0.25V0.5Fe4.25O12 has the optimum comprehensive properties, Ms = 17.254 emu/g, Hc = 4.043 Oe, Mr = 0.268 emu/g, ΔH = 81 Oe, εr = 18.68 @ 1 MHz, and tanδε = 0.002. The as-prepared material has potential application in communication devices such as circulators and isolators.