Effects of Zn-Cr-substitution on the structural and magnetic properties of Ni1−xZnxFe2−xCrxO4 ferrites

The structural, magnetic, and optical properties of Ni–Mg–Zn ferrite prepared with different complexing agents via sol–gel method

“…Ni-Mg-Zn ferrite has a broad application prospect as a typical soft magnetic material with a small magnetocrystalline anisotropy constant. Many researchers synthesize ferrite with some conventional technology including electrospinning method, microwave method, rheological phase reaction method, sol-gel method, solid phase method, microemulsion method, mechanochemical reaction method, etc [17][18][19][20][21][22][23][24][25]. In all synthesis methods, the sol-gel method is one of the simple, cheap and versatile techniques, which quickens the synthesis of compounds, lets surface morphology fine and makes crystal homogeneity.…”

Tunable Magnetic and Electrical Properties of Cobalt and Zinc Ferrites CO1-XZnXFe2O4 Synthesized by Combustion Route

“…The lattice parameter is sensible to cation distribution in octahedral and tetrahedral sites. In present work we supposed the cation distribution by the following relations 28,29 : In equation 9. a th is theorical lattice parameter, r a is the average radius on tetrahedral positions, r b is the average radius on octahedral positions and R O is the radius of oxygen. The parameters r a and r b are shown in equations 10 and 11, on which a i is ionic concentration of species in tetrahedral and octahedral positions and r i is the radius of ionic species Zn 2+ , Co 2+ , Fe 2+ , Fe 3+ .…”

Positron annihilation lifetime, cation distribution and magnetic features of Ni1−xZnxFe2−xCoxO4 ferrite nanoparticles

“…A total of about 10 6 coincidence events were collected in each lifetime spectrum. A source of strength $15 mCi from 22 NaCl deposited on a Mylar foil with 7 mm thickness was used.…”

“…The second assumption was that Co 2+ ions went into both A and B sites (because of the preference position of Co 2+ ). 22 In the third assumption, we considered that Co 3+ existed in the B sites because of charge valence, lattice parameter and magnetic properties. In fact, to conrm these assumptions, we calculated the mean ionic radii of A and B sites (r A and r B ) for all the samples: 23…”

“…where K 1 is the cubic anisotropy constant given by ) and m 0 is the permeability of free space. 22,37 Firstly, the room temperature experimental data M vs. H were Table 3. It is observed that the anisotropy constant decreased, which leads to the decrease in coercivity except for x ¼ 0.2, as shown in Fig.…”