Direct imaging of dopant sites in rare-earth element-doped permanent magnet and correlated magnetism origin

Abstract

The changes in the spin states of the Fe3+ cations located at the 4f1 tetrahedral sites result in magnetization enhancement of La-doped M-type SrFe12O19 ferrite.

Artificially steering electrocatalytic oxygen evolution reaction mechanism by regulating oxygen defect contents in perovskites

“…1H and fig. S20) also support a decreased oxidation state of Co ions and an increased oxygen vacancy concentration along with the ball milling time (32,33), agreeing well with the EXAFS results. High-resolution transmission electron microscopy (HRTEM) and x-ray photoelectron spectroscopy (XPS) were also performed to study the surface structure of LSCO after ball milling (figs.…”

Role of site selective substitution, magnetic parameter tuning, and self heating in magnetic hyperthermia application: Eu-doped magnetite nanoparticles

“…In the crystal structure of Eu doped Fe 3 O 4 along with the different Wyckoff sites occupied by the Fe and O, respectively, shows Fe 3+ cations occupying 8a sites at (1/8, 1/8, 1/8), Fe 3+ /Fe 2+ cations occupying 16d sites at (1/2, 1/2, 1/2), and oxygen anions with reference to 32e position at ( u , u , u ). 21,22…”

“…In the crystal structure of Eu doped Fe 3 O 4 along with the different Wyckoff sites occupied by the Fe and O, respectively, shows Fe 3+ cations occupying 8a sites at (1/8, 1/8, 1/8), Fe 3+ /Fe 2+ cations occupying 16d sites at (1/2, 1/2, 1/2), and oxygen anions with reference to 32e position at (u,u,u). 21,22 Moreover, from Fig. 3 (generated from VESTA) and the cation distribution from Rietveld Renement (RR), it can be visualized that Eu ions opt to be in the octahedral (B) sites rather than the tetrahedral (A) sites.…”

In situ annealing achieves an ultrafast synthesis of high coercive strontium ferrite foams and beyond

“…In this case, multi-ion co-substitution may become a promising trend for the improvement of permanent magnetic properties of strontium ferrites. [33][34][35][36] On the other hand, the grain size is also a dominant factor for the coercivity of permanent magnetic materials. [37][38][39] It is of great significance to improve the coercivity of the M-type strontium ferrite by restraining the agglomeration of grains and making the particle size close to the critical size of the materials.…”