Thermal hysteresis and domain states in Ni–Zn ferrites synthesized by oxalate precursor method

Synthesis of nanosized nickel zinc ferrite using electric arc furnace dust and ferrous pickle liquor

“…The high value of the coercivity at Ni content was also obtained by Abu El-Fadl et al in NZF prepared by microwave combustion method, and by Chaudhari et al in NZF synthesized by oxalate precursor method. The phenomenon of coercivity increase with increase of Ni content is attributed to the high magnetocrystalline anisotropy energy of Ni ions in comparison to Zn ions 13 , 40 . It is also observed from Table 7 that sample N 0.0 ZF of zero Ni content exhibits higher coercivity compared to N 0.25 ZF sample (11.41 and 2.55, respectively).…”

“…The existence of Mn, Mg and Ca impurities in the prepared NZF samples can explain the saturation magnetization of the zero Ni sample where the presence of Ni modifies the cations distribution and the magnetic moments in the NZF spinel lattice. Mn 2+ and Ca 2+ cations prefer the tetrahedral sites in the spinel lattice, whereas Mg 2+ cations prefer the octahedral sites 37 – 40 . As Mn 2+ cations with high magnetic moment (5 μ B ) occupy the tetrahedral sites and Mg 2+ cations with zero magnetic moment occupy octahedral sites, M A increases and M B decreases.…”

Precursor combustion synthesis of nanocrystalline cobalt substituted nickel zinc ferrites from hydrazinated mixed metal fumarates

“…Various instrumental and traditional wet chemical methods namely; combustion [11], sol-gel [12][13][14], coprecipitation [15,16], spray pyrolysis [17], hydrothermal synthesis [18], reverse micelle [19,20] and precursor have been successfully employed for synthesis of nanocrystalline ferrites with compositional control and size uniformity. Among these methods, the precursor method is extensively explored by using different carboxylates like citrates [21], malates [22], oxalates [23,24] etc., which involves decomposing of metal carboxylates in furnace above 400 C to form nanocrystalline ferrite powder. Moreover some metal carboxylate precursors, coordinated with hydrazine has been found to undergo low temperature decomposition to metal oxides .…”

Single‐Phase Precursors for the Preparation of Spinel Ferrites via Oxalate Route: the Study of Cobalt Ferrite Synthesis

“…[44] Schuele [33] prepared ferrites from bimetal oxalates in a furnace by oxidation in air at 390 °C after one hour. In another study, Guo et al [44] described the direct formation of cobalt ferrite particles from the prepared oxalate after calcination already at 300 °C for 3 h. NiÀ Zn ferrites were prepared by Chaudhari et al [45] at 350 °C. On the other hand, Diodati et al [18] described the formation of various ferrites as pure phases only at � 900 °C in air, only after the individually formed oxides merged to form spinel.…”