“…The obtained Curie temperature value, T C , of the samples are lower than that of polycrystalline NiFe 2 O 4 (T C ¼ 883 K) 32 and NiFe 2 O 4 nanoparticles (T C > 800 K) 69 as well as Ni 0.6 Zn 0.4 Fe 2 O 4 nanoparticles (T C ¼ 663 K) reported by Gawas et al 70 The difference can be due to the replacement of magnetic Fe 3+ ions by nonmagnetic Al 3+ ions. The substitution of nonmagnetic ions reduces active magnetic linkages for magnetic ion per formula unit as a result Curie temperature decreases.…”
This article presents the annealing effect on the structural, elastic, thermodynamic, optical, magnetic, and electric properties of Ni0.6Zn0.4Fe1.5Al0.5O4 (NZFAO) nanoparticles (NPs).
“…The obtained Curie temperature value, T C , of the samples are lower than that of polycrystalline NiFe 2 O 4 (T C ¼ 883 K) 32 and NiFe 2 O 4 nanoparticles (T C > 800 K) 69 as well as Ni 0.6 Zn 0.4 Fe 2 O 4 nanoparticles (T C ¼ 663 K) reported by Gawas et al 70 The difference can be due to the replacement of magnetic Fe 3+ ions by nonmagnetic Al 3+ ions. The substitution of nonmagnetic ions reduces active magnetic linkages for magnetic ion per formula unit as a result Curie temperature decreases.…”
This article presents the annealing effect on the structural, elastic, thermodynamic, optical, magnetic, and electric properties of Ni0.6Zn0.4Fe1.5Al0.5O4 (NZFAO) nanoparticles (NPs).
“…The structural and electrical properties of spinel ferrites are closely related. In some previous reports the structural, electrical and magnetic properties of Ni-Zn ferrites, prepared by different techniques, have been investigated [11][12][13][14][15][16][17][18][19][20].…”
Structural properties, impedance, dielectric and electric modulus spectra have been used to investigate the sintering temperature (T s ) effect on the single phase cubic spinel Ni 0.6 Zn 0.4 Fe 2 O 4 (NZFO) ceramics synthesized by standard ceramic technique. Enhancement of dielectric constants is observed with increasing T s . The collective contribution of n-type and p-type carriers yields a clear peak in notable unusual dielectric behavior is successfully explained by the Rezlescu model. The non-Debye type long range dielectric relaxation phenomenon is explained by electric modulus formalism. Fast response of the grain boundaries of the sample sintered at lower T s sample leading to small dielectric spin relaxation time, (several nanoseconds) have been determined using electric modulus spectra for the samples sintered at different T s . Two clear semicircles in impedance ColeCole plot have also been successfully explained by employing two parallel RC equivalent circuits in series configuration taking into account no electrode contribution. Such a long relaxation time in NZFO ceramics could suitably be used in nanoscale spintronic devices.
“…Here in the Ni–Zn–Co ferrite sample, the replacement of Fe 3+ ions by Gd 3+ ions may reduce active magnetic connections for magnetic ion per formula unit resulting in a decrease of T C . 63–65 In addition, the exchange interaction J for A–B sublattice is proportional to T C , which can be expressed by 66 where, K B is the Boltzmann constant, z = 8 and s = 1/2. Therefore, J is directly proportional to T C in thermo-magnetization and shown in Fig.…”
This study presents a modification of structure-dependent elastic, thermodynamic, magnetic, transport and magneto-dielectric properties of a Ni–Zn–Co ferrite tailored by Gd3+ substitution at the B-site replacing Fe3+ ions.
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