采用固相合成法,在1173～1213K温度范围内合成了NiO-NiFe2O4和0.5%TiO2掺杂的NiO-NiFe2O4。用X射线衍射表征了合成产物。在合成过程中将试样置于两个铂片之间,通过连续测量加热过程中试样的电阻,获得了试样电导率随时间的变化规律,建立了稳态扩散控制的NiFe2O4合成动力学方程,并讨论了掺杂0.5%TiO2对NiFe2O4合成反应速率的影响,获得了0.5%TiO2掺杂的NiFe2O4合成反应的速率系数、活化能、Ni 2＋和Fe3＋离子的平均扩散系数。
NiO-NiFe2O4 and 0.5%TiO2 doped NiO-NiFe2O4 were synthesized within temperatures of 1173-1213K by the solid reaction method.X-ray diffraction technique was used to characterize the synthesized products.The electrical conductivity of the sample versus time was obtained by putting the sample in between two platinum plates and measuring the resistance of the sample during heating.The kinetic equation of the steady diffusion control was established and the synthetic rate and the influence of 0.5%TiO2 on the synthetic rate of NiFe2O4 was discussed.The rate coefficient and the activation as well as the average diffusion coefficient of Ni2＋ and Fe3＋ were obtained.
参考文献
| [1] | 席锦会,刘宜汉,姚广春.MnO2对镍铁尖晶石惰性阳极材料性能的影响[J].功能材料,2005(03):374-376. |
| [2] | 席锦会,姚广春,刘宜汉,谢英杰.添加TiO2对镍铁尖晶石惰性阳极材料性能的影响[J].功能材料,2006(08):1242-1245. |
| [3] | 何汉兵,黄伯云,李志友,周科朝.BaO掺杂对10NiO-NiFe2O4复合陶瓷烧结致密化的影响[J].中国有色金属学报,2008(05):851-855. |
| [4] | 赖延清,张勇,张刚,李劼,贺跃辉,黄伯云,刘业翔.CaO掺杂对10NiO-NiFe2O4复合陶瓷烧结致密化的影响[J].中国有色金属学报,2006(08):1355-1360. |
| [5] | Hesse D. .THE SUBMICROSCOPIC STRUCTURE OF REACTION FRONTS IN SOLID-SOLID REACTIONS AND ITS CORRELATION WITH REACTION MECHANISM AND KINETICS[J].Solid state ionics,1997(1/2):1-15. |
| [6] | Veytizou C.;Valfort O.;Thomas G.;Quinson JF. .Zircon formation from amorphous silica and tetragonal zirconia: kinetic study and modelling[J].Solid state ionics,2001(3/4):315-323. |
| [7] | El-Shobaky HG.;Radwan NRE. .Investigation of solid-solid interactions in NiO/Fe2O3 system doped with ZnO[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2003(1/2):223-231. |
| [8] | 王淑兰,赵丹,姚广春.XRD分析TiO2和MnO2添加剂对固相合成NiFe2O4过程的影响[J].功能材料,2010(04):680-682,686. |
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