Synthesis, structural, magnetic and optical properties of nanocrystalline ZnFe2O4

Preparation of magnetically recyclable ZnFe2O4 nanoparticles by easy single‐step co‐precipitation method and their catalytic performance in the synthesis of 2‐aminothiophenes

“…The superparamagnetic property of the catalyst, which accounts for its simple recovery, was corroborated by VSM analysis. There was no hysteresis loop, and the ratio of magnetic remanence/magnetic saturation was 34.0 emu g _1 . The saturation magnetization of spinel ferrites originates from the difference in the magnetic moments of the cations occupying the octahedral and tetrahedral lattice sites positions.…”

Synthesis, characterization, magnetic properties and gas sensing applications of ZnxCu1−xFe2O4 (0.0≤x≤0.8) nanocomposites

“…Another surface-driven effect is the enhancement of the magnetic anisotropy with decreasing particle size [47]. In addition to the surface effect, the order-disorder characteristics of the materials have also a strong influence on the decrease of saturation magnetization [48]. The absence of hysteresis loop, remanence and coercivity for S-2, S-3 and S-4 is indication of the presence of super paramagnetic and single domain crystals.…”

Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen‐printed thick films for application in humidity sensing

“…Thus, Pradeep et al obtained a lattice parameter of 8.429 Å for nanocrystalline zinc ferrite and the inversion degree of 0.35. Lemine et al also explained reduction of the lattice parameter from 8.448 to 8.427 Å by redistribution of Zn 2+ and Fe 3+ ions within interstitial states resulting in changes in magnetic properties. Reduction of the lattice parameter can also be attributed to the presence of lattice defects .…”

“…The smaller peak at 1022.3 eV is close to literature values for BE Zn 2p 3/2 in the cases when Zn 2+ occupies octahedral sites . Sutka et al estimated the inversion degree using the intensity ratios of the main Zn2p 3/2 peak and shoulder. In our case, due to the presence of unreacted ZnO in the powder (even though this amount is small), according to Bera et al, the Zn2p 3/2 peak shape is due to the presence of three types of Zn 2+ : Zn 2+ on tetrahedral sites (normal spinel), Zn 2+ in the oxide and Zn 2+ in octahedral sites so estimation of the inversion degree was not possible.…”