Conventional solid state reaction technique was used to synthesize Ca 1−x Sr x (Fe 0.5 Ta 0.5 )O 3 multiferroic ceramics (where x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5). Powder of ingredients was mixed thoroughly in stoichiometric amount and calcined at 1150˚C for 5 h. Disk and toroid shaped samples prepared from each composition were sintered at 1450˚C for 5 h. The XRD analysis confirms that all compositions are single phase cubic perovskite structure. The theoretical and bulk density increases

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... h increase of Sr content, which may be attributed to the fact that the atomic weight and density of Sr are larger than those of Ca. The average grain size increased with increasing Sr content up to How to cite this paper: Bhuiyan, M.et al. 65 then decreased further increasing the Sr content. Firstly, it increased due to the higher values of grain size, and then decreased with the Sr content due to the lowering the grain size. The saturation magnetization, M s , increases for x = 0.2 and then decreases with increasing Sr content due to the pore acted as a pinning centre of electron spin; thereby Ms decreases also due to the grain size which is well supported by the permeability results. The decrease of magnetoelectric voltage coefficient α ME with content may be attributed to the increased porosity in the sample. The presence of the pores breaks the magnetic contacts between the grains. The highest value of α ME is 42.22 mV·cm −1 •Oe −1 for the composition x = 0.2 which is attributed to the enhanced mechanical coupling. It was revealed that there is a dramatic influence of Sr with content x = 0.2 and also has strong correlations on grain size as well as magnetic and magnetoelectric properties.