Abstract
The paper reports synthesis of nanoparticles of Sr0.5Ba0.5Nb2O6 (SBN) and Co1.2−xMnxFe1.8O4 (CMFO) via ceramic and hydroxide co-precipitation routes, respectively. The nanopowders of SBN–CMFO0.1 (MSBN0.1) and SBN–CMFO0.3 (MSBN0.3) are compacted together to form the desired magnetoelectric/magnetodielectric (ME/MD) composites. The Bi2O3 is used as a sintering aid. The Bi2O3 at three weight percent is observed to cause agglomeration of SBN and CMFO particles and improve the magnetomechanical coupling. The paper reports synthesis, structural and morphological studies on the MSBN composites. The composites are investigated for their dielectric, ME and MD properties. The results on the magnetocapacitance (MC) are observed interesting and could be correctly understood in terms of the stress-induced variation in the dielectric constant. The MC is observed to remain fairly constant between 10 and 500 kHz and possess a useful magnitude of nearly 4 %.
Highlights
MC is determined with applied magnetic field, Hdc, parallel and perpendicular to the applied ac electric field, Eac. The dielectric properties are investigated as a function of temperature from 300 to 470 °K and frequency (f) between 100 and 1 MHz, while ME and MD properties are determined at room temperature as a function of f and Hdc up to 6 kOe. The variation of a, b and MC are studied as a function of f and sintering temperature Ts. Synthesis of CMFO
The composites of ferroelectric and magnetostrictive compounds are known to exhibit a useful magnitude ofS
Owing to the discussion above, the present paper reports synthesis and characterization of ME and MD composites yMSBN = yCMFO ? (1-y) SBN ? 3 % Bi2O3 w/w
Summary
MC is determined with applied magnetic field, Hdc, parallel and perpendicular to the applied ac electric field, Eac. The dielectric properties are investigated as a function of temperature from 300 to 470 °K and frequency (f) between 100 and 1 MHz, while ME and MD properties are determined at room temperature as a function of f and Hdc up to 6 kOe. The variation of a, b and MC are studied as a function of f and sintering temperature Ts. Synthesis of CMFO
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