A novel reaction path to barium dysprosium zirconate [Ba _2DyZrO_9(6-δ))] by the auto ignition combustion synthesis method

摘要

Phase pure barium dysprosium zirconate [Ba_2DyZrO _((6-δ))] nanoparticles have been synthesized by a self-sustained single-step process by the combustion of an aqueous solution containing Ba, Dy and Zr ions as oxidants, citric acid as complexing agent and liquid ammonia as fuel. The X-ray diffraction studies have shown the single phase nature of the as-prepared powder without calcination. Peak positions manifest cubic double perovskite ABB'O_(6-δ) (δ=0.5) crystallites with lattice constant of 8.4139 ?. The average crystallite size calculated from the full width at half maximum was about 28 nm. The phase purity of the as-prepared nanopowder was further examined using differential thermal analysis, thermo gravimetry analysis; Laser Raman and Fourier transform infrared spectroscopy. The morphology of the as-prepared powder sample was identified with scanning electron microscopy. Evaluated particle size (30 nm) using transmission electron microscopic investigations confirmed the results obtained through the X-ray diffraction studies.