陈化对Ni—Cr合金电沉积的影响

采用周期伏安技术、恒电位阶跃法和可见光光谱技术研究了自然陈化和电化学陈化对 Ni/Cr 合金自 NiCl_2—CrCl_3体系中电沉积的电化学行为和沉积层质量的影响。研究表明,自然陈化和电化学陈化对于保持一定组成和高质量的 Ni/Cr 合金共沉积是需要的;电化学陈化所产生的少量 Cr2+离子在 Ni/Cr 合金的质量和组成方面,是一个重要的控制因素。     

Defect structure and electrical properties of LaSr_3Fe_3O_(10-δ)

As a mixed conductor,LaSr3Fe3O10-δ with triple layer perovskite intergrowth structure can be used as an oxygen separation membrane material and cathode material in solid oxide fuell cells.LaSr3Fe3O10-δ was synthesized via citrate acid route.Iodine titration method was used to determine the average valence of transition metal Fe and oxygen nonstoichiometry δ.Conductivities of LaSr3Fe3O10-δ were measured in the oxygen partial pressure range from 10-2×105 to 1×105 Pa,by Ac four probe method.Seebeck coefficient...