Effect of rare earth and transition metal La-Mn substitution on electrical properties of co-precipitated M-type Ba-ferrites nanoparticles

In the current research work Ba1-xLaxMnyFe12-yO19 hexa-ferrite nanoparticles of different compositions were synthesized using chemical co-precipitation technique. The structural properties were explored using X-ray diffractions (XRD), scanning electron microscopy (SEM) and Fourier transmission infrared spectroscopy (FTIR). XRD indexed pattern confirms the formation of M-type hexagonal phase. The crystallite size of synthesized samples ranges from 13 to 34 +/- 2 nm. FTIR peaks observe also confirmed the presence of metal- oxygen bond of the desired product. The position of peak at 467 cm(-1) corresponds to A(2)u vibration for octahedral Fe(4+)-O and peak position E-1u corresponds to vibration of Fe(3+)O-4 octahedral bonds. The band v(1) in range (677-559 cm(-1)) and v(2) in frequency range (356-419 cm(-1)) are associated to A and B sites. Dielectric properties of all compositions were measured with frequency. The dielectric constant, loss and tangent loss decrease from 26 to 9, 25 to 2 and 0.94 to 0.14, respectively with frequency. DC electrical resistivity is increased with dopant concentration increasing from 2.15 x 10(4) to 1.92 x 10(5) Omega.cm. (C) 2019 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.