The thermoelectronic power (α) of the system NiAlxFe2−xO4 and dc electrical resistivity (ϱ) are studied as a function of temperature and composition (x = 0, 0.2, 0.4, 0.6, 0.8, and 1). The single phase spinel structure is verified by X‐ray analysis. The conductivity in these compounds is explained in the light of the hopping mechanism. The results show that the resistivity increases with increasing aluminium content and the activation energy of conductivity in the paramagnetic region is higher than that in the ferrimagnetic region. The transition temperature (Tc) shifts to lower temperatures with increasing aluminium content. The thermoelectric power measurements indicated that the conductivity is due to compensation of electrons and holes. The majority of carriers are holes when the Al3+ replaces 50% of Fe3+ in the samples. The drift mobility μn for electrons is calculated at different temperatures. It increases exponentially with temperature as expected in case of ferrites and the values ranged between 10−4 and 10−6 cm2/Vs at room temperature.
We demonstrate that the promising effect of inclusion of single magnetic-domain type-M hexaferrite of barium (BaM) particles in polystyrene (PS) polymer (BaM/PS weight ratio = 2/1). The results show that the coercivity of BaM particles remarkably increases from 714 to 3772 Oe and remanence increases from 2.07 to 5.41 emu.g−1 when they embedded into PS. Moreover, magnetic coercivity and squareness of the BaM-PS are significantly larger, and is comparable with corresponding values of other BaM-polymer composites. Therefore, BaM-PS composite enforce itself as the modern potential materials with tendency of replacing existing composite materials in several applications.
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