Interfacial structure in silicon nitride sintered with lanthanide oxide

Dwyer, Christian; Ziegler, Alexander; Shibata, Nagoya; Winkelman, Graham B; Satet, R.L.; Hoffmann, Michael J.; Cinibulk, Michael K.; Becher, Paul; Painter, G. S.; Browning, Nigel D.; Cockayne, D. J. H.; Ritchie, Robert O.; Pennycook, Stephen J.

doi:10.1007/s10853-006-0152-2

Cited by 23 publications

(17 citation statements)

References 29 publications

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“…Our results put our sites 1 and 2 at 4.3±0.1 and 5.7±0.2 Å, respectively. While there is a slight difference, Dwyer et al 23 showed images that indicated that the HAADF‐STEM images obtained from different groups for this same interface are slightly different, as discussed below with reference to Fig. 6.…”

Section: Resultsmentioning

confidence: 95%

“… HAADF‐STEM images for La ions at the nitride prism interface with the IGF showing slight differences in La locations both at the interface and within the IGF (at arrows) (modified from Dwyer et al 23 ). …”

Section: Resultsmentioning

confidence: 99%

“…This effect of local composition in the IGF might offer a possible reason for the difference in the HAADF‐STEM images of La locations from several very high‐quality groups, 23 two of which are shown in gray scale in Fig. 6.…”

Section: Resultsmentioning

confidence: 99%

“…Recent high‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) has provided atomistic detail of the interface between the IGF and the crystal. Results show that RE elements preferentially segregate to specific locations at the Si 3 N 4 prism‐oriented surface, although different RE elements segregate into different locations along this interface, leading to different interface morphology 20–23 . Ab initio calculations provide additional information regarding the interface sites to which the RE ion adsorbs 24,25 .…”

Section: Introductionmentioning

confidence: 99%

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Molecular Dynamics Simulations of the Locations of La Ions in La–Si–O–N Intergranular Films in Silicon Nitride

Jiang

Garofalini

2010

Journal of the American Ceramic Society

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Molecular dynamics computer simulations were used to determine the locations and energies of La ions in silicate intergranular films (IGFs) between basal and prism‐oriented silicon nitride crystals as a function of composition. La segregation to the interfaces occurs at each surface with no nitrogen present in the IGF, but segregates preferentially to the prism surface with nitrogen in the IGF. La adsorption onto the prism surface occurs in the simulations at the two sites observed previously in studies using high‐angle annular dark field scanning transmission electron microscopy. The binding energies of La at the two sites differ with no nitrogen in the IGF, and both are more strongly bonded than for La in the interior of the IGF. However, with nitrogen in the IGF, the binding energies are less different between the two prism surface sites and the interior of the IGF, indicating a decreased driving force for segregation. The simulations provide evidence justifying the preferential segregation of La ions to the prism surface and also indicate that a variation in the local composition would cause some IGFs to show segregation of all La to the interface, leaving little La within the glassy IGF, while other IGFs may show more La remaining in the glassy IGF.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular Dynamics Simulations of the Locations of La Ions in La–Si–O–N Intergranular Films in Silicon Nitride

Jiang

Garofalini

2010

Journal of the American Ceramic Society

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“…Therefore, the investigation of their structure and properties is led not only by the theoretical interest but primarily by the strong technical impact. However, these glassy layers of the nanometer order are very difficult to be studied experimentally [2][3][4]. Therefore, the structure and properties of such layers are mostly extrapolated from bulk oxynitride glasses [5][6][7]13,14].…”

Section: Introductionmentioning

confidence: 99%