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M-type barium hexa-ferrites having general formula Ba1−xLaxFe12O19 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) have been prepared through conventional ceramic route. The effect of La3+ ions on structural, surface morphological, optical, magnetic, and frequency-dependent dielectric properties has been investigated through X-ray diffractometer, Fourier transmission infrared spectroscopy, scanning electron microscope,...