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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To understand possible interaction between magnetic and electric order parameters of Fe-doped Sr x Ba 1Àx Nb 2 O 6 (SBN), Fe-doped Sr 0:5 Ba 0:5 Nb 2 O 6 (SBN50) and Sr 0:4 Ba 0:6 Nb 2 O 6 (SBN40) are synthesized and investigated. Synthesis has been carried out via ceramic route. The paper reports synthesis, crystal structure, dielectric properties, P-E hysteresis loops, M-H hysteresis loops and magneto-capacitance of the Fe-doped SBN compositions. All the compositions are observed to exhibit a useful value of magnetocapacitance, especially at frequencies less than 10 kHz.

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