Structural and magnetic properties of zinc- and aluminum-substituted cobalt ferrite prepared by co-precipitation method

Abstract

Spinal ferrites having the general formula Co1−xZnxFe2−xAlxO4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) were prepared using the wet chemical co-operation technique. The samples were annealed at 800 • C for 12 h and were studied by means of X-ray diffraction, magnetization and low field AC susceptibility measurements. The X-ray analysis showed that all the samples had single-phase cubic spinel structure. The variation of lattice constant with Zn and Al concentration deviates from Vegard's law. The saturation magnetization σ s and magneton number nB measured at 300 K using high field hysteresis loop technique decreases with increasing x, suggesting decrease in ferrimagnetic behaviour. Curie temperature T C deduced from AC susceptibility data decreases with x, suggesting a decrease in ferrimagnetic behaviour.

Microwave combustion synthesis of zinc substituted nanocrystalline spinel cobalt ferrite: Structural and magnetic studies

“…On the basis of (i) transition from Neel's like collinear ferrimagnetic structure to a Yafet-Kittel like canting behavior and (ii) departure of the structure from thermodynamical stable cation distribution over the spinel sub lattice. Similar kind of simultaneous increase and decrease in the magnetization values with increasing zinc composition in the cobalt ferrite systems is in agreement with the earlier reports [39][40][41][42][43][44][45].…”

Fabrication of Highly Sensitive Electrochemical Sensor Based on Chromium-Doped Ferrite Nanoparticles: Hybrid Graphene Nanosheets for the First Voltammetric Determination of Asenapine Maleate in Formulations and Human Plasma

“…The slight variation in lattice constant may be attributed to very slight difference in the ionic radii of Fe 3+ (0.64 Å) and Cr 3+ (0.63 Å) ions. [51][52][53] The results confirm formation of the nano-crystalline structures, Table S1. The crystallite size is consistent with that reported for nanoferrites 49,54 and which is essential for construction of any nanosensor.…”

Structural and magnetic properties of Zn-substituted cobalt ferrites prepared by co-precipitation method

“…At the lower temperatures the susceptibility value rises with heating. According to some studies 25,26 the susceptibility is inversely proportional to the coercive force (H c ), therefore the increase in w AC (T) implies a decrease in H c. The existence of the coercive force indicates that the samples contain spin clusters of different sizes. 6 Fig.…”