A novel Barium Titanate-Zinc ferrite (BaxTiO3-ZnXFe2O4) heterostructure nanocomposites are synthesized at temperatures less than 500ºC which is the major theme of the present research. The synthesis technique is adapted in such a way that the size of the particle is governable. In this research two dissimilar ratios of BTO (hard-site) and ZFO (soft-site) composites are synthesized (H-S 90:10, H-S 60:40) and quantitatively analyzed for their exclusive structural, textural, spectroscopic, and optical properties. With XRD data, structural refinement has been carried out showing 49 % of harder-BTO phase (Triclinic) and 51% of softer-ZFO phase (Cubic) for H-S 90:10 and similarly 78% of harder-BTO phase and 22% of softer-ZFO phase in the H-S 60:40 composite respectively. Very small particles of 6nm are found which is confirmed by SEM histogram and sample purity was determined using EDX analysis. Proofs for the formation of nanocomposites and the existence of Tetrahedral and Octahedral phases for each sample were given using FTIR Spectroscopy. From UV spectrometer data, Tauc’s plot is used to find the wide energy band gap which is observed to be 2.6651 and 3.1971 eV, thus proving that these composites can present themselves as a budding candidate for nano-level optoelectronic devices and other photovoltaic applications.

A novel low temperature preparation technique (<500ºC) is employed for synthesizing nanoscale Barium Titanate -Nickel ferrite composites, where the particle size is controllable. Two different ratios of hard and soft site composites (BTO-NFO 80:20, BTO-NFO 70:30) are synthesized and characterized to study their unique structural, morphological and magnetic properties. The structural refinement studies using XRD data showed 43 % of hard phase (anorthic structure) and 57% of soft phase (Cubic Structure) for BTO-NFO 80:20 and similarly 76% of hard phase and 24% of soft phase in the BTO-NFO 70:30 composite respectively. The SEM and EDAX are used to identify smaller particles of 10 nm using histogram and their sample purity. The VSM analysis at room temperature shows superparamagnetic behavior within the soft ferro magnet with maximum retentivity 2.39 emu/g and saturation magnetization, 10.71 emu/g stating that the composites can be used for various biological applications like drug delivery, hyperthermia, MRI, etc. The ratio Mr/Ms is much less than 0.5, which states that multidomain grains or single domains are formed and the particle interaction is by magneto-static interaction confirming its superparamagnetic nature.

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