Sublimation growth and characterization of bulk aluminum nitride single crystals

1997 ◽  
Vol 179 (3-4) ◽  
pp. 363-370 ◽  
Author(s):  
Cengiz M. Balkaş ◽  
Zlatko Sitar ◽  
Tsvetanka Zheleva ◽  
L. Bergman ◽  
R. Nemanich ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Single Crystals ◽  
Sublimation Growth

Growth and characterization of epitaxial layers on aluminum nitride substrates prepared from bulk, single crystals

2002 ◽  
Vol 240 (3-4) ◽  
pp. 508-512 ◽  
Author(s):  
J. Carlos Rojo ◽  
Leo J. Schowalter ◽  
Remis Gaska ◽  
Michael Shur ◽  
M.A. Khan ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Single Crystals ◽  
Epitaxial Layers ◽  
Bulk Single Crystals

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

CBED analysis of impurity distributions in AlN

1990 ◽  
Vol 48 (4) ◽  
pp. 214-215
Author(s):  
Daniel Callahan ◽  
G. Thomas
Keyword(s):  
Aluminum Nitride ◽  
Bulk Material ◽  
Strong Dependence ◽  
Lattice Parameter ◽  
Promising Technique ◽  
Nitride Ceramics ◽  
Surface Phases ◽  
Convergent Beam ◽  
Oxygen Impurities

Oxygen impurities may significantly influence the properties of nitride ceramics with a strong dependence on the microstructural distribution of the impurity. For example, amorphous oxygen-rich grain boundary phases are well-known to cause high-temperature mechanical strength degradation in silicon nitride whereas solutionized oxygen is known to decrease the thermal conductivity of aluminum nitride. Microanalytical characterization of these impurities by spectral methods in the AEM is complicated by reactions which form oxygen-rich surface phases not representative of the bulk material. Furthermore, the impurity concentrations found in higher quality ceramics may be too low to measure by EDS or PEELS. Consequently an alternate method for the characterization of impurities in these ceramics has been investigated.Convergent beam electron diffraction (CBED) is a promising technique for the study of impurity distributions in aluminum nitride ceramics. Oxygen is known to enter into stoichiometric solutions with AIN with a consequent decrease in lattice parameter.

Growth and Characterization of Sulfur-doped GaSe Single Crystals

2015 ◽  
Vol 30 (8) ◽  
pp. 887 ◽  
Author(s):  
HUANG Chang-Bao ◽  
NI You-Bao ◽  
WU Hai-Xin ◽  
WANG Zhen-You ◽  
XIAO Rui-Chun ◽  
...  
Keyword(s):  
Single Crystals

Synthesis, growth and characterization of 4-dimethylaminobenzaldehyde-4-nitrophenylhydrazone single crystals

Optik ◽  
2014 ◽  
Vol 125 (12) ◽  
pp. 2912-2917 ◽  
Author(s):  
R. Gandhimathi ◽  
R. Dhanasekaran
Keyword(s):  
Single Crystals

scholarly journals Growth and characterization of propyl-para-hydroxybenzoate single crystals

2014 ◽  
Vol 37 (6) ◽  
pp. 1461-1469 ◽  
Author(s):  
N. Karunagaran ◽  
P. Ramasamy ◽  
R. Perumal Ramasamy
Keyword(s):  
Single Crystals
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