Gd-doped soft Mn–Zn nanoferrites: synthesis, microstructural, magnetic and dielectric characterizations

Tailoring the microstructural, magnetic and dielectric properties of vanadium ions substituted nickel ferrite nanocrystals

“…Generally, the overlap of atomic orbitals remarkably reduces in nanoregime. Hence the width of several electronic bands decreases which results in significant enhancement in band gap [27]. Due to the blue shift in optical band gap and good absorption properties, all these prepared ferrite samples can be utilized to eliminate the red and infrared region of electromagnetic spectrum.…”

“…DC conductivity and AC conductivity. Overall electrical conductivity for spinel ferrites can be written as [27,28,29] σ t (T, ω) = σ dc (T) + σ ac (T, ω)…”

“…The hopping of electrons is responsible for observing AC component in overall electrical conductivity for spinel ferrites. The AC conductivity usually obeys a power law as follows [27,29] σ ac (T, ω) = α(T) ω n (10) where α(T) is a constant term, which is temperature dependent. It takes a fixed value for a fixed temperature and a fixed composition, 'n' represents an exponent which is dimensionless.…”

“…It also signifies the ability of storing energy of a dielectric material. The imaginary part ′′ ( ) is directly related to the energy dissipation in any dielectric material [27]. Figure 7 demonstrates the frequency-dependent real unit of permittivity at 300 K for all prepared nanoferrites.…”

Dielectric Relaxation and Suitability of Scaling parameters study on Mn0.7+xZn0.3SixFe2-2xO4 (x = 0.0 - 0.3) Ferrites

“…Restricted to recent (2016-2020) reports on dielectric properties of ZnxMn1-xFe2O4 (x = 0.0 to 1.0) spinel ferrites synthesized by solid-state reaction method [11][12], sol-gel route [13], combustion process [14], microwave-induced urea-nitrate process [15] are available in the literature. On the other hand, divalent Cr 2+ -substituted ferrites, Mn0.5Zn0.5-xCrxFe2O4 (x = 0.0, 0.3 and 0.5) [16] and cobaltites, Mn0.5Zn0.5-xCrxCo2O4 (x = 0.0, 0.3 and 0.5) [17], trivalent cation Gd 3+ -substituted Mn0.5Zn0.5GdxFe2-xO4 prepared by facile coprecipitation method [18] and chemical co-precipitation route [19], Nd 3+ -substituted Mn0.5Ni0.1Zn0.4GdxFe2-xO4 (x = 0.0 to 1.0) synthesized by usual double ceramic method [20] as well as Sm 3+ -Gd 3+ co-substituted Mn0.4Zn0.6SmxGdyFe2-(x+y)O4 system prepared by microwave hydrothermal route [21] and tetravalent titania (Ti 4+ ) ions substituted Mn0.5Zn0.5TixFe2-4/3xO4 (x = 0.0 to 0.5) prepared by hydrothermal method [22] have been reported. Couple of research articles describing dielectric behaviour of Mn0.4Zn0.6Fe2O4 + Co0.4Zn0.6Fe2O4 composites [23] and CaCu3Ti4O12 (0.0 to 0.5 wt %) doped Mn-Zn ferrites [24] are also available.…”