Composition and frequency dependent dielectric properties of Li–Mg–Ti ferrites

Infrared spectral evolution, elastic, optical and thermodynamic properties study on mechanically milled Ni0.5Zn0.5Fe2O4 spinel ferrite

Magnetic study of substituted Mg-Mn ferrites synthesized by citrate precursor method

Green and facile process for Ni0.4Cu0.2Zn0.4Fe2−xEuxO4 (x = 0.00–0.10) spinel ferrite nanoparticles (SNPs) prepared via ultrasonic irradiation (without any post annealing process) has been deeply investigated. The influence of Eu3+ substitutions on the structure, morphological, optical, magnetic, electrical and dielectric traits of NiCuZn SNPs was assessed. Tauc plots revealed direct optical band gaps in a very tight interval of 1.86–1.90 eV. Magnetization measurements exposed a superparamagnetic behavior at room temperature and below the blocking temperature (TB) a superparamagnetic-ferromagnetic transition was noticed. The saturation magnetization (Ms) value is highest for pure Ni0.4Cu0.2Zn0.4Fe2O4 (i.e. x = 0.00) SNP with Ms ~ 58.9 emu/g at room temperature. The saturation magnetization (Ms) declines with rising Eu3+ substituting content. AC conductivity decreases as a function of exponent power base law. Maximum variation in dc conductivity is observed to be around the substitution ratio of x = 0.02. It is found that activation energy is highly dependent on both Eu ions substitution ratios and temperature ranges. The frequency dependence of dielectric functions is explained by Koop's models based on Maxwell-Wagner theory.

Investigation of structural and physical properties of Eu3+ ions substituted Ni0.4Cu0.2Zn0.4Fe2O4 spinel ferrite nanoparticles prepared via sonochemical approach

Measurement of Young's modulus of nanocrystalline ferrites with spinel structures by atomic force acoustic microscopy

Thermopower and electrical conductivity studies of polycrytsllineIn3+ and Al3+ substituted Mg-Mn ferrites having different compositions were undertaken in the temperature range 300–700 K, using differential and two-probe methods respectively. It has been observed that all the ferrites are found to exhibit clear and well-defined transtions near their respective Curie temperatures in both Seebeck coefficient and electrical conductivity versus temperature behavior. The elastic behavior of these ferrites has also been studied as a function of composition at room temperature using ultrasonic pulse transmission technique and it has been found that the elastic moduli decrease continuously with increasing Indium concentration and increase with increasing Aluminium dopants. Suitable explanation for the observed phenomena are given.

Electrical and Elastic Behavior of In and Al Substituted Mg-Mn Ferrites

Elastic behaviour of Zn-substituted LiMg and LiMgTi ferrites

Electrical conductivity and thermopower studies of titanium-substituted lithium-magnesium ferrites

The present work is intended to investigate the thermopower and electrical conductivity studies of some substituted strontium W-type hexagonal ferrites as a function of composition and temperature. On the basis of the sign of the Seebeck coefficient (S), the ferrites under investigation have been classified as n-type semiconductors. Using the experimental values of Seebeck coefficient at various temperatures, the values of charge carrier concentration have been determined. On the basis of the temperature variation of charge carrier mobility, the conduction mechanism in these ferrites has been discussed.

Y. Purushotham

Papers

Electrical and Elastic Behavior of In and Al Substituted Mg-Mn Ferrites

Elastic behaviour of Zn-substituted LiMg and LiMgTi ferrites

Electrical conductivity and thermopower studies of titanium-substituted lithium-magnesium ferrites

Charge transport and conduction mechanism of some substituted strontium w-type hexagonal ferrites

Thermopower and electrical conductivity of titanium substituted magnesium ferrites