Preparation of CuNb2O6 nanocrystalline powders by sol–gel method
Preparation of CuNb2O6 nanocrystalline powders by sol–gel method
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DOI：
10.1016/j.jallcom.2008.10.108
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发表时间：
2009-05
影响因子：
6.2
通讯作者：
Y. Zhang;Baojian Fu;Qiang Liu
中科院分区：
文献类型：
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作者：
Y. Zhang;Baojian Fu;Qiang Liu
本研究通过将Nb2O5溶解在HF酸中得到Nb5+的可溶性溶液，并以此可溶性溶液为起始原料，采用溶胶-凝胶法在低温下合成了CuNb2O6纳米晶粉末。采用 XRD 和 SEM 技术对 CuNb2O6 粉体的晶体结构和微观结构进行了表征，并研究了 pH 值和柠檬酸与铌离子的摩尔比（CA/Nb）对 CuNb2O6 粉体晶体结构和微观结构的影响。 XRD和TG/DTA结果表明，通过将前驱体在600℃下煅烧，可以得到单斜晶相的CuNb2O6合成粉末。随着CA/Nb和pH值的变化，CuNb2O6的平均粒径在20nm到85nm之间，通过将前驱体在600℃下加热2h可以获得20nm的粒径。
The soluble solution with Nb5+was obtained by dissolving Nb2O5into HF acid, and CuNb2O6nanocrystalline 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 CuNb2O6powders 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 CuNb2O6powders were also investigated. XRD and TG/DTA results show that the monoclinic phase of CuNb2O6for synthesized powders can be obtained by calcining the precursor at 600°C. The average particle size of CuNb2O6ranges from 20nm to 85nm with varying the CA/Nb and pH values, and 20nm of the particle size can be obtained for the CuNb2O6powders by heating the precursor at 600°C for 2h.