Abstract
The soluble solution with Nb 5+ was obtained by dissolving Nb 2O 5 into HF acid, and CuNb 2O 6 nanocrystalline powders were synthesized using this soluble solution as starting materials at a low temperature by sol–gel method in this study. The crystal structure and microstructure of CuNb 2O 6 powders were characterized by XRD and SEM techniques, and the effects of pH value and the molar ratio of citric acid to the niobium ions (CA/Nb) on the crystal structure and microstructure of CuNb 2O 6 powders were also investigated. XRD and TG/DTA results show that the monoclinic phase of CuNb 2O 6 for synthesized powders can be obtained by calcining the precursor at 600 °C. The average particle size of CuNb 2O 6 ranges from 20 nm to 85 nm with varying the CA/Nb and pH values, and 20 nm of the particle size can be obtained for the CuNb 2O 6 powders by heating the precursor at 600 °C for 2 h.
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