scholarly journals Identification and characterization of point defects in aluminum nitride and zinc oxide crystals

2008 ◽  
Author(s):  
Sean M. Evans
Keyword(s):  
Zinc Oxide ◽  
Aluminum Nitride ◽  
Point Defects ◽  
Oxide Crystals ◽  
Identification And Characterization

Defect Identification in Silicon Using Electron Nuclear Double Resonance

1985 ◽  
Vol 46 ◽  
Author(s):  
C.A.J. Ammerlaan ◽  
M. Sprenger ◽  
R. Van Kemp ◽  
D.A. Van Wezep
Keyword(s):  
Electronic Structure ◽  
Point Defects ◽  
Double Resonance ◽  
Paramagnetic Centers ◽  
Electron Nuclear Double Resonance ◽  
Defect Identification ◽  
Vacancy Complex ◽  
Identification And Characterization ◽  
Atomic And Electronic Structure

AbstractThe application of electron nuclear double resonance (ENDOR) for identification and characterization of point defects in silicon is reviewed. Taking the vacancy and the boron-vacancy complex as examples it is discussed how ENDOR can provide information on the atomic and electronic structure of paramagnetic centers.

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.

Identification and characterization of aldose reductase in cultured rat mesangial cells

Diabetes ◽  
1992 ◽  
Vol 41 (9) ◽  
pp. 1165-1171 ◽  
Author(s):  
R. Kikkawa ◽  
K. Umemura ◽  
M. Haneda ◽  
N. Kajiwara ◽  
S. Maeda ◽  
...  
Keyword(s):  
Aldose Reductase ◽  
Mesangial Cells ◽  
Identification And Characterization
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