The grain boundary phase of silicon nitride containing additives Y2O3 and Nd2O3 has been studied by means of a newly developed 300kV field emission ATEM. The composition of the two-grain boundary phase of about 1 nm thick is successfully determined. It is then found that the compositions among the grain boundaries are not the same and the additives of Y2O3-Nd2O3 are poor in the two-grain boundary, while they are rich in the triple points.
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Bando, Y., Suematsu, H. & Mitomo, M. Grain Boundary Phase Analysis of Silicon Nitride by a Newly Developed 300kV Field-Emission Electron Microscope. MRS Online Proceedings Library 346, 733–738 (1994). https://doi.org/10.1557/PROC-346-733