Abstract
In the present work, structural studies have been carried out on new nanosized calcium barium niobate (CaxBa1–xNb2O6, CBN) ceramic nanopowders synthesized by an aqueous organic gel route at a relatively low calcination temperature of 800 °C. Homogeneous Ca–Ba–Nb precursor gels were prepared using the starting materials Ca-EDTA, Ba-EDTA, and niobium citrate complex from which precursor powders were obtained after prolonged heating at 80 °C. The phases, nanostructures, local structures, microstructures, and morphological analysis of the CaxBa1–xNb2O6 (x = 0.25, 0.35, and 0.50) nanopowders were studied by X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Raman and IR spectroscopy. The powder X-ray and electron diffraction patterns show the formation of a nearly single-crystalline phase of CBN powders with a partially occupied tungsten bronze (TB)-type structure in tetragonal symmetry. The precursor gels calcined in the temperature range 800–900 °C generated na...
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