A note concerning the temperature dependence of the linear absorption coefficient of X-rays in the perfect single crystal of silicon

1972 ◽  
Vol 13 (1) ◽  
pp. K71-K73
Author(s):  
J. D. Stephenson ◽  
N. G. Alexandropoulos ◽  
H. Wagenfeld
Keyword(s):  
Absorption Coefficient ◽  
Single Crystal ◽  
Temperature Dependence ◽  
X Rays ◽  
Linear Absorption Coefficient ◽  
Perfect Single Crystal ◽  
Linear Absorption

Détermination du coefficient d'absorption des rayons X à partir des mesures de réflectométrie X

2004 ◽  
Vol 82 (1) ◽  
pp. 75-79 ◽  
Author(s):  
E Ech-chamikh ◽  
I Aboudihab ◽  
M Azizan ◽  
A Essafti ◽  
Y Ijdiyaou
Keyword(s):  
Absorption Coefficient ◽  
Amorphous Carbon ◽  
X Rays ◽  
Absorption Coefficients ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Simple Method ◽  
Material Layer ◽  
Reflectivity Spectra ◽  
Good Agreement

In this paper, we present a simple method that allows, among other things, to determine the absorption coefficient of X-rays from reflectivity measurements. This method is applicable if the analysed material is deposited on a substrate denser than the material layer, so that the X-rays reflectivity spectra exhibit two well-resolved descents. In such cases, the amplitude of the first descent (characteristic of the material layer) is directly related to the linear absorption coefficient of the material constituting the layer. We have been able to clarify this relationship and apply it successfully for several cases of materials, especially amorphous carbon and silicon. Values of thus obtained mass absorption coefficients are in very good agreement with those tabulated in the literature.[Journal translation]

Optical Absorption In Hg1−xCdxTe

1997 ◽  
Vol 484 ◽  
Author(s):  
Vaidya Nathan
Keyword(s):  
Experimental Data ◽  
Optical Absorption ◽  
Band Structure ◽  
Absorption Coefficient ◽  
Numerical Results ◽  
Recent Experimental Data ◽  
Narrow Gap ◽  
Interband Transitions ◽  
Linear Absorption Coefficient ◽  
Linear Absorption

AbstractThe theory of optical absorption due to interband transitions in direct-gap semiconductors is revisited. A new analytical expression for linear absorption coefficient in narrow-gap semiconductors is obtained by including the nonparabolic band structure due to Keldysh and Burstein-Moss shift. Numerical results are obtained for Hg1−xCdxTe for several values of x and temperature, and compared with recent experimental data. The agreement is found to be good.

scholarly journals Determination of the quasi-TE mode (in-plane) graphene linear absorption coefficient via integration with silicon-on-insulator racetrack cavity resonators

2014 ◽  
Vol 22 (15) ◽  
pp. 18625 ◽  
Author(s):  
Iain F Crowe ◽  
Nicholas Clark ◽  
Siham Hussein ◽  
Brian Towlson ◽  
Eric Whittaker ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Silicon On Insulator ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Cavity Resonators ◽  
Te Mode

scholarly journals Effect of egg white, perlite, gypsum and fly ash in environment friendly insulation materials

2018 ◽  
Vol 16 (3) ◽  
pp. 329-342
Author(s):  
Hanifi Binici ◽  
Orhan Aksogan ◽  
Rifat Resatoglu
Keyword(s):  
Thermal Conductivity ◽  
Fly Ash ◽  
Absorption Coefficient ◽  
Egg White ◽  
Radiation Hazard ◽  
Binding Property ◽  
Insulation Material ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Insulation Materials

In this study, engineering features of insulation materials produced from egg white, perlite, gypsum and fly ash were investigated. Densities, water absorption ratios, ultrasonic velocities and thermal conductivity coefficients of samples were determined. Furthermore, linear absorption coefficient were measured by gamma ray saturation levels at 17.7, 26 and 60 keV energies. Thermal conductivity coefficients of the produced composites were found to be in the range 0.0882- 0.0995 Kcal/mh?C. Egg white decreased the linear absorption coefficients. Unit weights of samples were found to be dependent on their contents. As gypsum rate increased, unit weight also increased. As perlite rate increased thermal conductivity coefficient decreased. As egg white decreased the linear absorption coefficient decreased, also. The most important benefits of these types of materials are their being impermeable and perfectly compatible with the environment. These lighter type materials were/are compatible with Turkey and the Middle East environment. Egg white has been resistant to radiation. Hence, it is highly compatible with the environment. The compressive and flexural strengths of mortars decreased with the use of egg whites in mortar. So, egg white enhances the binding property of samples. In most cases, some organic and/or inorganic additives are used as well, to improve the physical and mechanical properties of mortar, such as egg whites and others. Finally, this study shows that it is possible to produce an insulation material resistant to sound and radiation by using egg white, perlite and fly ash. It is seen that the samples incorporating egg white could be used at hospitals, military and industrial facilities and shelters which are under radiation hazard. Furthermore, this insulation materials will be put to use in industry in Turkey after many experiments have been done on laboratory.

Preconditions of Creation of Self-Adhesive Elastic Radiation Shielding Coverings

2019 ◽  
Vol 974 ◽  
pp. 429-434
Author(s):  
D.V. Cherkasov ◽  
V.V. Avdonin ◽  
Y.V. Yurkin
Keyword(s):  
Absorption Coefficient ◽  
High Hardness ◽  
Radiation Shielding ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Ethylene Propylene ◽  
Ethylene Propylene Rubber

Results of scientific researches in the field of creation of self-adhesive radiation shielding materials on the basis of polymers are presented in this article. It is stated, that radiation shielding coverings on the basis of ethylene propylene rubber are more preferable than coverings on the basis of BSR and SBS. Materials on the basis of ethylene propylene rubber possess high hardness at scaling from metal (more than 600 N/m) and hardness at breakoff from concrete (more than 0,1 MPa), have a high linear absorption coefficient.

Superstructure Determination of PbZrO3

1998 ◽  
Vol 54 (5) ◽  
pp. 524-530 ◽  
Author(s):  
K. Yamasaki ◽  
Y. Soejima ◽  
K. F. Fischer
Keyword(s):  
Structure Refinement ◽  
Lead Zirconate ◽  
X Rays ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Acta Cryst ◽  
X Ray ◽  
Domain Structures ◽  
X Ray Absorption

By taking into account the effects of domain structures and X-ray absorption, the superstructure of PbZrO3, lead zirconate, has been determined at room temperature. The space group is Pbam with a unit cell of a = 5.8884 (19), b = 11.771 (4) and c = 8.226 (3) Å, with Z = 8. The intensity data were collected using short-wavelength synchrotron X-rays of 0.350 Å; this reduces the linear absorption coefficient to 11.93 mm−1. The structure refinement was performed using only the data of superlattice reflections which are free from ambiguity and resulting from the domain structure; the final R value is 0.047 for 335 unique superlattice reflections. Zr atoms show the antiphase-type displacement along the z axis; oxygen octahedra show tilt of the type a − a − c 0 using Glazer's [Acta Cryst. (1972), B28, 3384–3392; Acta Cryst. (1975), A31, 756–762] notation.

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