CAJ | 학술논문

以Na2CO3、NaF、Co（NO3）2.6H2O和HNO3为原料,去离子水为溶剂,柠檬酸为螯合剂,采用自蔓延法制备了Na1.7Co2O4-xFx（x=0,0.05,0.1,0.15,0.2）粉体。粉末的X射线衍射分析表明,该方法能合成单一相的Na1.7Co2O4-xFx。粉体的粒度分布分析显示其粒度分布在11.505~50.508μm,平均粒径为28.543μm。烧结试样的扫描电镜照片显示F的掺杂能抑制晶粒的长大。在373~873K下,烧结体热电性能的测试结果显示,随着F的加入,烧结体试样的电导率与Seebeck系数均有提高,其中Na1.7Co2O3.85F0.15的烧结体在873 K时Seebeck系数和功率因子达到最大值分别为254μV.K 1和1.20×10 3W.m 1.K 2。
이Na2CO3、NaF、Co（NO3）2.6H2O화HNO3위원료,거리자수위용제,저몽산위오합제,채용자만연법제비료Na1.7Co2O4-xFx（x=0,0.05,0.1,0.15,0.2）분체。분말적X사선연사분석표명,해방법능합성단일상적Na1.7Co2O4-xFx。분체적립도분포분석현시기립도분포재11.505~50.508μm,평균립경위28.543μm。소결시양적소묘전경조편현시F적참잡능억제정립적장대。재373~873K하,소결체열전성능적측시결과현시,수착F적가입,소결체시양적전도솔여Seebeck계수균유제고,기중Na1.7Co2O3.85F0.15적소결체재873 K시Seebeck계수화공솔인자체도최대치분별위254μV.K 1화1.20×10 3W.m 1.K 2。
Na1.7Co2O4-xFx （x-=0, 0.05, 0.1, 0.15, 0.2） polycrystalline samples were prepared by a simple self-propagation route with Na2CO3, NaF, Co（NO3）2·6H2O and HNO3 as raw materials, de-ionized water as a dissolvent, and citric acid as a chelating agent. The synthesized powders were analyzed by X-ray diffraction （XRD）. The microstructures of the sintered samples were observed by scanning electron microscopy （SEM）. The results indicated that there was a simple phase and no other phases generated in the powders. The grain size of the powders was from 11.505 μm to 50.508 μm, with an average grain size of 28.543μm. The doping F- could inhibit grain growth during the sintering process. The thermoelectric properties of Na1.7Co2O4-xFx were carefully studied from 373 K to 873 K. The results showed that the electrical conduction and Seebeck coefficient of Na1.7Co2O4-xFx samples increased with F- doping. The maximum Seebeck coefficient and power factor of Na1.7Co2O3.85F0.15 samples were 254 μV.K^-1 and 1.20× 10^-3 W.m^-1·K^-2 at 873 K, respectively.