Structure, Mössbauer and AC susceptibility of strontium nanohexaferrites: Effect of vanadium ions doping

Abstract

This study contains information about the effect of V3+ vanadium doping on structural, morphological and magnetic properties of SrFe12-xVxO19 (x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10) nanohexaferrites. Samples have been prepared via citrate sol-gel method and characterized. XRD and SEM analyses revealed the formation of M-type nanohexaferrites, wherein the particle size remained unaltered with the increase in vanadium contents. Mossbauer spectra disclosed the preferred occupation of V3+ ions at 4f1 tetrahedral site. Zero field (ZFC) and field cooled (FC) magnetization data in the temperature range of 2–400 K did not exhibit any blocking temperature, indicating mostly the ferromagnetic long-range ordering for the studied nanohexaferrites. Moreover, at low temperatures a spin glass behavior was observed. The ac-susceptibility showed a weakening in the Fe3+ - O2− - Fe3+ indirect exchange interactions with the increase in V3+ contents. Magnetic properties are argued in terms of the empirical rules of indirect exchange interactions taking into account the substitution of Fe3+ cations by V3+ ones in the preferred sites.