Recently, from the strong industrial demand for innovative materials multifunctional, researches have tried to obtain new methods to evaluate and optimize their properties and applications. More recently, the binary niobate compounds were found to be promising candidates for application in microwave devices. Among those compounds, CuNb-2O-6 exhibits excellent dielectric properties. However, for this application, studies to reduce the temperature of synthesis of this material should be made. In this present work, we used a solid-solid reaction at low temperature. The hydrated niobium was complexed with ammonium oxalate and oxalic acid, and then the mixture was mixed with Cu(NO-3)-2. The product was subjected to calcination. The polymeric precursor was analyzed by thermogravimetry and differential thermal analysis (TG/DTA). The obtained powder of CuNb-2O-6 obtained was characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray (EDX) analysis. The structure was also analyzed by means of Rietveld refinement of the X-ray data. The synthesized CuNb-2O-6 had an average particle size of 50-70 nm.
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