Abstract
Perovskite Ti-doped LaFeO3 (LaFe1−xTixO3, x=0, 0.1, and 0.2) nanoparticles synthesized by the polymer pyrolysis method were investigated. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray absorption near edge spectroscopy (XANES), and vibrating sample magnetometry (VSM) were used to characterize phase, morphology, valence states and magnetic properties of the samples. The samples had a phase of the orthorhombic structure with crystallite sizes of 25±2–47±2nm for nanoparticles, while ceramic samples had the grain sizes of 0.9±0.3–6.0±2.3μm. The result of XANES spectra showed that the Fe3+/Fe4+ and Ti4+ exist in the samples. The weak ferromagnetic behavior at room temperature is observed for all LaFe1−xTixO3 samples with a maximum magnetization of 0.32emu/g for x=0.2. Additionally, larger hysteresis loops induced significantly in ceramic samples with no saturation up to 10kOe. The dielectric properties as a function of frequency at low temperatures suggest the presence of polarization in the samples due to the electron hopping between Fe3+ and Fe4+ ions.
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