Synthesis, characterization and dielectric properties of nanocrystalline Ba 2DySbO 6 perovskite

Abstract

Nanoparticles of barium dysprosium antimonate (Ba 2DySbO 6), a complex double perovskite ceramic oxide, synthesized by a novel single-step auto ignition combustion process is presented for the first time. The phase purity was examined by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA) and Fourier transform infrared (FT-IR) spectroscopy. The surface and ultrafine morphology were examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The XRD studies shown that the as-prepared powder is phase pure Ba 2DySbO 6 and has a complex cubic perovskite (A 2BB′O 6) crystalline structure with lattice constant a = 8.4376 Å. The TEM image of the as-prepared powder reveals that the particle size is in the range 20–50 nm. The nanocrystals of Ba 2DySbO 6 synthesized by the combustion technique could be sintered to 97% of the theoretical density at a temperature of 1550 °C for 3 h. The dielectric constant ( ɛ r) was 17 and the loss factor (tan δ) was 5 × 10 −3 at 3 MHz.