Röntgenbeugungs- und Neutronenbeugungsuntersuchungen an Ferriten der reihe MnxZn1−xFe2O4

Abstract

The cation distribution of MnxZn1−xFe2O4 (x = 0, 0.1, 0.2, 0.4, 0.6, 0.8, 0.9, 1.0) has been determined by neutron diffraction. The fraction of the Mn2+ ions in the tetrahedral sites is correlated to the variation of the lattice parameter with x. It is concluded from the measurements that zinc ferrite is a completely normal spinel and that the Mn2+ ions only occupy the tetrahedral sites up to x = 0.6.

Mechano-chemical synthesis and characterization of microstructure and magnetic properties of nanocrystalline Mn1−xZnxFe2O4

“…Fig. 3 compares the calculated lattice parameters with the standard lattice constants from the ICDD database for ferrites [17] with different Mn content and confirms a good agreement between the different sets of data. Fig.…”

“…The spectra were taken without any applied field. The velocity scale of all the spectra was referenced to room temperature data for ␣-Fe [17]. The fitting of the spectra was done by the simplex matrix method, assuming each spectrum to be a sum of Lorentzian functions and having a continuous distribution of hyperfine fields with a fixed intensity ratio of 3:2:1:1:2:3 [16].…”

“…A number of additional measurements were performed in a vibrating sample magnetometer (VSM) using a Lakeshore-7300 VSM. The temperature dependence of magnetization (ZFC) was studied at an applied field of 50 Oe in the temperature range 5-350 K. unambiguously indexed by suitable comparison with the ICDD (International Centre for Diffraction Data) standards for the Mn 1−x Zn x Fe 2 O 4 spinel structure [17]. The XRD patterns of both the as-milled and annealed powders reveal essentially a singlephase microstructure with no additional peaks or phase including unreacted oxides or impurities from the milling media.…”

Structure and cation distribution of (Mn0.5Zn0.5)Fe2O4 thin films on SrTiO3(001)

“…15 , which results in a compression of 1.2% compared to the bulk value of 8.480 Å for (Mn 0.4 Zn 0.6 )Fe 2 O 4 . 21 For SrTiO 3 , the lattice constant is calculated to be 3.904 Å with a FWHM of 0.12 coinciding with the exact value given in literature. 42 Additionally to these 2h-x scans, / scans were obtained using the SrTiO 3 Comparing the XPS core-level binding energy of the Mn2p 3=2 emission line at 640.8 eV with published ones suggests Mn 2þ coordinated by oxygen.…”

Structure of manganese zinc ferrite spinel nanoparticles prepared with co-precipitation in reversed microemulsions

“…The FEFF model of the EXAFS signal at the three metal K edges was built from the crystallographic data on the mixed ferrite (Koenig and Chol 1968). Following the argumentation in the study of Calvin et al (2002b), a comprehensive FEFF calculation was adopted with a simultaneous relaxation of the three spectra, exploiting numerous connections and restraints between the parameters of the EXAFS models of the constituent elements.…”