Atomic-number Contrast of Nitrogen Ions
- Practical Electron Microscopy and Database -
- An Online Book -

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Figure 3443 shows high-resolution HAADF Z-contrast STEM images presenting the interface between Si3N4 matrix (on the top of each image) and the mixtures (at the bottom of each image) of  Yb2O3 and Al2O3 (a) and  Yb2O3 and SiO2 (b). The Yb atoms, visible here as bright spots due to enhanced electron scattering (giving higher Z-contrast), are located periodically along the interface. The images are oriented along the low-index zone axis [0001] of Si3N4. Note the hexagonal ring structures represent the typical Si3N4 atomic structure [2] based on phase reconstruction microscopy techniques, even though the individual close atomic positions of Si–N cannot be fully resolved here because the limit of the spatial resolution of the STEM system used.

High-resolution STEM images showing the atomic interface between a Si3N4 matrix grain, oriented along the low-index zone axis [0001], and two different mixtures

Figure 3443. High-resolution STEM images showing the atomic interface between a Si3N4 matrix
grain and two different mixtures. Adapted from [1]

 

 

 

 

 

 

 

[1] A. Ziegler, M. K. Cinibulk, C. Kisielowski, and R. O. Ritchie, Atomic-scale observation of the grain-boundary structure of Yb-doped and heat-treated silicon nitride ceramics, Appl. Phys. Lett. 91, 141906 (2007).
[2] A. Ziegler, J. C. Idrobo, M. K. Cinibulk, C. Kisielowski, N. D. Browning, and R. O. Ritchie, Appl. Phys. Lett. 88, 041919 (2006).

 

 

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