SIMS artifacts in the near surface depth profiling of ozygen conducting ceramics
Using ultra low energy SIMS ion beams of oxygen and nitrogen, the very near surface region of an 16O annealed La0.8Sr0.2MnO3 pellet has been depth profiled in order to investigate the surface layer composition and to determine any perturbing ion beam-target interactions. By ratioing the measured cation species, the results indicate that only Sr segregation at the near surface can be clearly identified, and no separate oxide layer was present on the top surface. By monitoring the build up of the altered layer associated with SIMS depth profiling, it was observed that the depth at which the altered layer was fully formed was deeper than the expected projected range, RP, of the ion beam. These results confirm Sr excess in the near surface, which will have an effect on the vacancy concentration and therefore the surface exchange coefficient, k.
Low energy SIMS LSM Surface ezchange coefficient Ozygen diffusion
Sarah Fearn Jeremy Rossiny John Kilner
Department of Materials, Imperial College, London, SW7 2AZ, UK
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
811-815
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）