Abstract
We report the synthesis of nanocrystalline phase-pure YCrO3 powders by a poly acrylic acid (PAA) assisted sol–gel process at a comparatively low calcination temperature of 600 °C. The role of PAA in the powder processing was investigated systemically using Fourier transform infrared (FTIR) spectroscopy, differential thermal and thermogravimetric analyzer (DT/TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). PAA is found to have the desirable property of forming stable complexes with the cations, Y3+ and Cr3+ at a low pH. FTIR results demonstrated that in the gel-precursor, the carboxylate groups of PAA bond to Y3+ and Cr3+ in a monodentate and a bridging bidentate configuration, respectively, owing to the properties of Cr3+ giving the best correlation with PAA. The obtained particles have capsule-like morphology with a mean diameter of 40 nm. It is presumed that this morphology is due to the extended-chain configuration of PAA in the aqueous solution. The method showed a good control over particle size, morphology, chemical homogeneity, stoichiometry and agglomeration of the powders.
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