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The paper reports the synthesis of Ba 1-x Sr x TiO 3 (BST) for x = 0.20, 0.25, and 0.30 via hydroxide co-precipitation route to result into the BST nanoparticles of size nearly 50 nm. The La 0.67 Sr 0.33 MnO 3 (LSMO) is also synthesized using co-precipitation route to achieve nanocrystaline particles. Further, the magnetodielectric (MD) composites of BST0.20, BST0.25, and BST0.30 are formed by addition of the LSMO at y = 0.1 and 0.2. The parent BST compositions are analysed for its dielectric properties. The composite LSMO-BST (LBST) is investigated for the variation of dielectric constant and impedance spectra as a function of applied magnetic field for the frequency between 500 Hz to 1 MHz. The observations on MD effect show that the dielectric constant possesses contributions due to magnetic field dependant interfacial polarization and variations due to the induced stress.

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Theory of low-frequency magnetoelectric effects in ferromagnetic-ferroelectric layered compositesAbstract. Considering the earlier reports the present paper explores usefulness of Ni and Mn substituted cobalt ferrite to form the magnetostrictive phase of the magnetoeletric (ME) composites. Co 0.9 Ni 0.1 Fe 2-x Mn x O 4 (CNFM) for x=0, 0.1, 0.2, 0.3 and 0.4 are synthesize using hydroxide co-precipitation route. The CNFM is studied for its electrical and magnetic properties. The observations shows that x=0.3 is a useful composite possessing optimal values of resistivity (), Saturation magnetization (Ms), remanent magnetization (Mr), coercive field (Hc) and initial permeability (). Further in the present paper Ba 0.5 Sr 0.5 Nb 2 O 6 (BSN) is use to form the Piezoelectric phase of the ME composite. The ME composites yMNBS = yCNFM + (1-y) BSN are synthesized for y=0.2 to 0.6 and investigated for its structural, dielectric and magnetoelectric properties.