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We report the synthesis of Y-substituted Mg-Zn ferrites using conventionalstandard ceramic technique. XRD patterns confirm the single phase cubic spinelstructure up to x = 0.03 and appearance of a secondary phase of YFeO3for higherY contents. FESEM images depict the distribution of grains and EDS spectraconfirmed the absence of any unwanted element. Completion of solid statereaction and formation of spinel structure has been revealed from FTIR spectra.The FTIR data along with lattice constant, bulk density and porosity werefurther used to calculate the stiffness constant (Cij), elastic constant andDebye temperatures. Mechanical stability of all studied compositions isconfirmed from Cij using Born stability conditions. Brittleness and isotropicnature are also confirmed using Poisson ratio and anisotropy constants,respectively. The enhancement of dc electrical resistivity with Y content isobserved. The energy band gap (increased with Y contents) is found in goodagreement with dc electrical resistivity. Ferrimagnetic to paramagnetic phasechange has been observed from the field dependent high temperaturemagnetization curves. The magnetic moments and saturation magnetization werefound to be decreased with increasing temperature. The Curie temperature (Tc)has been measured from temperature dependent magnetic moment (M-T) and initialpermeability and found to be in good agreement with each other. Decrease in Tcwith Y content is due to redistribution of cations and weakening of theexchange coupling constant. The magnetic phase transition has been analyzed byArrott plot and found to have second order phase transition. The dc resistivityendorses the prepared ferrites are suitable for high frequency and hightemperature magnetic device applications as well.

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg-Zn ferrites