Effect of crystal orientation on the segregation of dopants in LaSrCoO3 perovskite oxide.

What is it about?

We have shown how the surface energy based on the crystal orientation affect the segregation of dopant (Sr) in LaSrCoO3 perovskite oxide.

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Why is it important?

Our findings based on statistical evaluation of the SEM-EBSD revealed that all grain orientations have a very similar precipitation tendency in terms of number density. The number density of the Sr-rich precipitates on grains was determined to be in the range of 1–60 precipitates per mm2. However, the vast majority of the grains had a narrower number density within 1–5 precipitates per mm2. The area coverage of precipitates on grains, on the other hand, showed a clear dependence on grain orientation. Grains having orientations close to {001} have more than 3 times higher area coverage of precipitates at the surface compared to the other orientations, {101} and {111}. In summary, the crystal orientation mainly plays a role in the size and growth of secondary phases (fed by Sr diffusion from the lattice to the surface).