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Nanoporous BaTiO3 particles with an average diameter of 27 nm have been synthesized using a soft template based on poloxamer. The pore width has been found to be ∼10 nm. The nanoporous particles have a surface area of 107 m2gm-1. This introduces a large surface area leading to the creation of a large number of oxygen vacancies. The latter contributes to the ferromagnetic behavior of the nanoparticles. A multiferroic property was exhibited by these particles. The oxygen vacancy concentration decreased as the BaTiO3 particle size increased. The magnetization decreased with an increase in the particle size. A magnetodielectric parameter of 11% has been observed in this system corresponding to an applied magnetic field of 10 kOe. [ABSTRACT FROM AUTHOR]

Bismuth Ferrite nanodiscs of ∼0.6 nm thickness and 4.5 nm diameter have been synthesized within Na-4 mica nanochannels. The nanocomposite shows weakly ferromagnetic behavior. The zero field cooled magnetization data indicate a spin glass like behavior by the nanodisc surfaces with a freezing temperature of 10 K. The material shows superparamagnetic and strongly ferroelectric behavior at room temperature. A magnetodielectric coupling has been observed. The change in dielectric constant as a function of magnetic field up to 1.2 T is found to be ∼12% at room temperature, which is much higher than that reported so far in the case of bulk bismuth ferrite systems. The dielectric response of this nanocomposite system has been studied in very high frequency range between 80 and 120 GHz at room temperature. The data indicate the presence of resonance interaction. [ABSTRACT FROM AUTHOR]