scholarly journals Direct Observation of Lattice Planes at Grain Boundaries in Silicon Nitride

1977 ◽  
pp. 433-440 ◽  
Author(s):  
D. R. Clarke
Keyword(s):  
Silicon Nitride ◽  
Grain Boundaries ◽  
Direct Observation ◽  
Lattice Planes

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

scholarly journals Direct observation of nanometer-scale amorphous layers and oxide crystallites at grain boundaries in polycrystalline Sr1−xKxFe2As2 superconductors

2011 ◽  
Vol 98 (22) ◽  
pp. 222504 ◽  
Author(s):  
Lei Wang ◽  
Yanwei Ma ◽  
Qingxiao Wang ◽  
Kun Li ◽  
Xixiang Zhang ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Direct Observation ◽  
Nanometer Scale

scholarly journals A diffuse interface model of interfaces: Grain boundaries in silicon nitride

2005 ◽  
Vol 53 (18) ◽  
pp. 4755-4764 ◽  
Author(s):  
Catherine M. Bishop ◽  
Rowland M. Cannon ◽  
W. Craig Carter
Keyword(s):  
Silicon Nitride ◽  
Grain Boundaries ◽  
Diffuse Interface ◽  
Interface Model ◽  
Diffuse Interface Model

Grain Boundary Phase Analysis of Silicon Nitride by a Newly Developed 300kv Field-Emission Electron Microscope

1994 ◽  
Vol 346 ◽  
Author(s):  
Y. Bando ◽  
H. Suematsu ◽  
M. Mitomo
Keyword(s):  
Electron Microscope ◽  
Silicon Nitride ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Phase Analysis ◽  
Field Emission ◽  
Boundary Phase ◽  
Emission Electron ◽  
Triple Points

ABSTRACTThe 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.

Direct observation of strain-induced non-equilibrium grain boundaries

2015 ◽  
Vol 159 ◽  
pp. 432-435 ◽  
Author(s):  
B.B. Straumal ◽  
O.A. Kogtenkova ◽  
F. Muktepavela ◽  
K.I. Kolesnikova ◽  
M.F. Bulatov ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Direct Observation ◽  
Non Equilibrium

Direct observation of intergranular cracks in sintered silicon nitride

2004 ◽  
Vol 84 (25-26) ◽  
pp. 2767-2775 ◽  
Author(s):  
Seiichiro Ii ‖ ◽  
Chihiro Iwamoto ◽  
Katsuyuki Matsunaga ◽  
Takahisa Yamamoto ◽  
Masato Yoshiya ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Direct Observation ◽  
Sintered Silicon

Arrangement of rare-earth elements at prismatic grain boundaries in silicon nitride

2004 ◽  
Vol 84 (12) ◽  
pp. 755-762 ◽  
Author(s):  
G. B. Winkelman * ◽  
C. Dwyer ◽  
T. S. Hudson ◽  
D. Nguyen-Manh ◽  
M. Döblinger ◽  
...  
Keyword(s):  
Rare Earth ◽  
Silicon Nitride ◽  
Rare Earth Elements ◽  
Grain Boundaries
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