Abstract
La2NiMnO6 powders were prepared by using a polyvinyl alcohol (PVA) sol–gel route. Differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) were used to characterize the precursors and the derived oxide powders. Single-phase La2NiMnO6 of about 40–50nm diameters was synthesized at 600°C for 2h, without the formation of any intermediate phase. La2NiMnO6 ceramics sintered at 1000°C had tunability of 28% and 20% at 8V/mm at 100kHz and 1MHz, respectively. The electric field dependence of dielectric constant of the ceramics was well described by using the “multi-polarization mechanism” model.
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