English
韦秀华, 魏敏, 陈栋华. ZnCo_2O_4尖晶石纳米粉体的新型共沉淀法合成及表征[J]. 信阳师范学院学报(自然科学版), 2007, 20(3): 341-345.
引用本文: 韦秀华, 魏敏, 陈栋华. ZnCo_2O_4尖晶石纳米粉体的新型共沉淀法合成及表征[J]. 信阳师范学院学报(自然科学版), 2007, 20(3): 341-345.
shu
WEI Xiu-hua, WEI Min, CHEN Dong-hua. Preparation and Characterization of the Spinel Oxide ZnCo_2O_4 Obtained by Novel Coprecipitation Met[J]. Journal of Xinyang Normal University (Natural Science Edition), 2007, 20(3): 341-345.
Citation: WEI Xiu-hua, WEI Min, CHEN Dong-hua. Preparation and Characterization of the Spinel Oxide ZnCo_2O_4 Obtained by Novel Coprecipitation Met[J]. Journal of Xinyang Normal University (Natural Science Edition), 2007, 20(3): 341-345.
shu

ZnCo_2O_4尖晶石纳米粉体的新型共沉淀法合成及表征

Preparation and Characterization of the Spinel Oxide ZnCo_2O_4 Obtained by Novel Coprecipitation Met

    摘要
  • 摘要: 以草酸为沉淀剂、乙醇为溶剂,通过新型共沉淀法合成分子前躯体锌钴草酸复合盐ZnCo2(C2O4)3.4H2O,对该前躯体在不同温度下热处理即可制得锌钴尖晶石粉体.利用热重分析仪(TGA)和差示扫描量热仪(DSC)对前躯体热分解过程分别进行热失重分析和动力学分析.结果表明,前躯体热分解仅经历2个热失重过程(脱结晶水和最后分解)且最后分解过程遵循随机成核和核随后生长单一的动力学机理,活化能不随转化率的变化而变化.由此说明前驱体为草酸复合盐而不是二元混合盐.利用X-射线衍射(XRD)、红外光谱(IR)和透射电子显微镜(TEM)等分析手段对尖晶石粉体进行表征.结果显示,前躯体在低温段450~650℃煅烧2 h即可获得单相、颗粒细小均匀的尖晶石粉体,高温750℃煅烧,得到ZnO和缺锌的锌钴尖晶石的混合物.

     

    Abstract: The zinc-cobalt-oxide spinel was obtained by the calcination of the molecular precursor at different temperature,namely,zinc cobalt oxalate ZnCo2(C2O4)3·4H2O prepared by novel coprecipitation method using oxalic acid as precipitator and ethanol as solvent.The thermal weight loss analysis and kinetics analysis of the decomposition process of the precursor were performed on a Thermogravimetry analyzer(TGA) and Differential scanning calorimeter(DSC).The results showed that the weight loss occurs only two ste...

     

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