Semiconductor Crystal Properties

2019 ◽  
pp. 217-239
Author(s):  
Javier E. Hasbun ◽  
Trinanjan Datta
Keyword(s):  
Semiconductor Crystal ◽  
Crystal Properties

Texture measurements in Al2O3 using BEKP

1994 ◽  
Vol 52 ◽  
pp. 608-609
Author(s):  
M. D. Vaudin ◽  
J. P. Cline
Keyword(s):  
Neutron Diffraction ◽  
Rapid Method ◽  
Crystallographic Orientation ◽  
Specimen Surface ◽  
X Ray Diffraction ◽  
Anisotropic Crystal ◽  
X Ray ◽  
Verification Method ◽  
Crystal Properties ◽  
Backscattered Electron

The study of preferred crystallographic orientation (texture) in ceramics is assuming greater importance as their anisotropic crystal properties are being used to advantage in an increasing number of applications. The quantification of texture by a reliable and rapid method is required. Analysis of backscattered electron Kikuchi patterns (BEKPs) can be used to provide the crystallographic orientation of as many grains as time and resources allow. The technique is relatively slow, particularly for noncubic materials, but the data are more accurate than any comparable technique when a sufficient number of grains are analyzed. Thus, BEKP is well-suited as a verification method for data obtained in faster ways, such as x-ray or neutron diffraction. We have compared texture data obtained using BEKP, x-ray diffraction and neutron diffraction. Alumina specimens displaying differing levels of axisymmetric (0001) texture normal to the specimen surface were investigated.BEKP patterns were obtained from about a hundred grains selected at random in each specimen.

TRANSPORT AND CRYSTAL PROPERTIES OF α– AND β – Ce3Al

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-783-C8-784 ◽  
Author(s):  
J. Sakurai ◽  
T. Matsuura ◽  
Y. Komura
Keyword(s):  
Crystal Properties

Magnet system for providing a forced convection for semiconductor crystal growth under microgravity

1998 ◽  
Author(s):  
Ch. Stenzel ◽  
H. Lenski ◽  
P. Dold ◽  
Th. Kaiser ◽  
K.-W. Benz ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Forced Convection ◽  
Semiconductor Crystal ◽  
Magnet System

Relativistic AB Initio calculations of the properties of ionic solids

1986 ◽  
Vol 320 (1553) ◽  
pp. 107-158 ◽  
Keyword(s):  
Ab Initio ◽  
Short Range ◽  
Correlation Energy ◽  
Electron Gas ◽  
Empirical Method ◽  
Coulombic Interactions ◽  
Ionic Solids ◽  
Electron Correlation Energy ◽  
Crystal Properties ◽  
Semi Empirical

Relativistic ab initio calculations of inter-ionic potential energies are used to develop a reliable non-empirical method for predicting the properties of ionic solids containing the heaviest ions. A physically realistic method for describing the non-negligible differences between free and in-crystal ion wavefunctions is described. Functions are presented for describing the partial quenching, arising from ion wavefunction overlap, of the standard long-range form of the inter-ionic dispersive attractions. These attractions are shown to be distinct from the contributions to the inter-ionic potentials that arise from that portion of the electron correlation energy which is nonzero solely because of overlap of the ion wavefunctions. The results presented for NaCl, MgO and the fluorides of Li, Na, Ag and Pb show that these modifications overcome the deficiencies of previous calculations. Ab initio predictions of the closest cation-cation and anion-anion short-range interactions, which are not available from semi-empirical fits to experimental data, are presented. The non-point coulombic interactions between pairs of anions, derived by adding the dispersive attractions to the short-range interactions, are compared with previous semi-empirical and approximate ab initio results. The uncorrelated short-range inter-ionic potentials computed exactly are compared with those predicted from electron-gas theory. The use of the electron-gas approximation to describe any of these potentials degrades the quality of the predicted crystal properties.

A Photoinduced Spin Transition Iron(II) Complex with Liquid-Crystal Properties

2004 ◽  
Vol 16 (11) ◽  
pp. 869-872 ◽  
Author(s):  
S. Hayami ◽  
K. Danjobara ◽  
K. Inoue ◽  
Y. Ogawa ◽  
N. Matsumoto ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Spin Transition ◽  
Crystal Properties
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