Infrared Absorption Studies of Thermal Donors in Silicon

1985 ◽  
Vol 59 ◽  
Author(s):  
Peter Wagner
Keyword(s):  
Cross Sections ◽  
Infrared Absorption ◽  
Uniaxial Stress ◽  
Ir Absorption ◽  
Extended Defect ◽  
Ir Absorption Spectra ◽  
Absorption Studies ◽  
Kinetics Of Formation ◽  
Kinetics Of ◽  
Ground State Energies

ABSTRACTInfrared absorption investigations of oxygen containing silicon reveal that the thermal donors generated by annealing around 450 °C consist of a series of shallow double donors with slightly differing ground state energies. The kinetics of formation and decay of these donors in samples with varying oxygen content annealed at temperatures between 460 and 600 °C support the relation of the thermal donors to aggregates of oxygen atoms. A preferential orientation of thermal donors induced by uniaxial stress during their growth demonstrates their low symmetry and extended defect-like nature. Optical cross sections evaluated by comparing IR-absorption spectra with resistivity measurements allow to estimate the concentrations of the different donors.

Study of the Infrared Absorption Spectra of Some Pyridine Derivatives-Iodine Complexes

1976 ◽  
Vol 30 (2) ◽  
pp. 200-204 ◽  
Author(s):  
F. M. Abdel Kerim ◽  
F. Abou El Fotouh
Keyword(s):  
Complex Formation ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Ir Absorption ◽  
Pyridine Derivatives ◽  
Thermodynamic Constants ◽  
Ir Absorption Spectra ◽  
Infrared Absorption Spectra ◽  
The Stability ◽  
Iodine Complexes

The ir absorption spectra of some pyridine derivatives-iodine complexes were measured in the region 400 to 1400 cm−1 and the results are discussed. The effect of complex formation on the intensities of some of the bands was investigated. The thermodynamic constants of these complexes were calculated. It was found that the stability of the complex depends to a large extent on the electronegativity as well as the position of the substituent on the pyridine nucleus. The structures of formed complexes are discussed.

scholarly journals Absorption cross sections and kinetics of formation of AlO at 298 K

2017 ◽  
Vol 675 ◽  
pp. 56-62 ◽  
Author(s):  
Juan Carlos Gómez Martín ◽  
Shane M. Daly ◽  
James S.A. Brooke ◽  
John M.C. Plane
Keyword(s):  
Cross Sections ◽  
Absorption Cross ◽  
Kinetics Of Formation ◽  
Kinetics Of

Defect Generation during Plastic Deformation of Si-Rich Cz-Grown SiGe Crystals

2009 ◽  
Vol 156-158 ◽  
pp. 295-298
Author(s):  
Nikolai Yarykin ◽  
Nikolay V. Abrosimov
Keyword(s):  
Solid Solution ◽  
Plastic Deformation ◽  
Absorption Spectra ◽  
Residual Strain ◽  
Wave Number ◽  
Ir Absorption ◽  
Defect Generation ◽  
Ir Absorption Spectra ◽  
Kinetics Of ◽  
Solution Decay

The IR absorption spectra and kinetics of the oxygen solid solution decay were studied in the Si1¡xGex crystals (0 · x · 0:055) plastically deformed at 680±C up to the 2{5% residual strain. It is found that the defects of non-dislocation nature, the dislocation trails, are formed during the plastic deformation of all studied SiGe crystals. The ¯ne structure of the IR absorption spectra around the 1000 cm¡1 wave number is found to be nearly identical in the pure Si (no Ge) samples and Si1¡xGex crystals with x · 0:02. At higher x the ¯ne structure was not detected due to the alloy-related broadening. In all studied crystals, the decay of the supersaturated oxygen solid solution at 650±C is determined by oxygen agglomeration at the dislocation trails as shown by the comparison with the samples annealed at 1150±C.

Investigation of the annealing kinetics of solid films of organic compounds according to IR absorption spectra

1983 ◽  
Vol 38 (5) ◽  
pp. 569-572
Author(s):  
N. I. Monakhova ◽  
Yu. A. Pentin ◽  
A. B. Remizov ◽  
A. I. Fishman
Keyword(s):  
Absorption Spectra ◽  
Organic Compounds ◽  
Ir Absorption ◽  
Solid Films ◽  
Ir Absorption Spectra ◽  
Kinetics Of

Infrared Absorption Study of HfO2 and HfO2/Si Interface Ranging from 200cm−1 to 2000cm−1

2004 ◽  
Vol 811 ◽  
Author(s):  
Kazuyuki Tomida ◽  
Haruka Shimizu ◽  
Koji Kita ◽  
Kentaro Kyuno ◽  
Akira Toriumi
Keyword(s):  
Absorption Spectra ◽  
Infrared Absorption ◽  
Monoclinic Phase ◽  
Peak Shift ◽  
Amorphous Structure ◽  
Intensity Change ◽  
Ir Absorption ◽  
Ir Absorption Spectra ◽  
Xrd Patterns ◽  
Middle Infrared

ABSTRACTIn this paper, we report infrared absorption studies of HfO2, HfO2/Si interface and Hf(1−x)SixOy. Both HfO2 crystallization and SiO2 formation at the interface can be clearly detected in the absorption spectra in the far and middle infrared regions, respectively. By measuring the intensity change and the peak shift of infrared absorption spectra as functions of annealing temperature and time together with XRD patterns, we discuss a difference of the amorphous structure between HfO2 and SiO2, and also show an evolution of HfO2 crystallization in the monoclinic phase up to 1000 °C. On the other hand, it is shown that the interfacial SiO2 layer is qualitatively similar to the thermally grown SiO2. Furthermore, it is demonstrated that a Si incorporation into HfO2 film significantly changes the IR absorption spectra, and that the Hf(1−x)SixOy film is phase-separated with an appearance of modified monoclinic phase by higher temperature annealing.

Near-IR Absorption Spectra for the Buckminsterfullerene Anions: An Experimental and Theoretical Study

1992 ◽  
Author(s):  
Del R. Lawson ◽  
Daniel L. Feldheim ◽  
Colby A. Foss ◽  
Peter K. Dorhoug ◽  
C. M. Elliott
Keyword(s):  
Absorption Spectra ◽  
Theoretical Study ◽  
Ir Absorption ◽  
Near Ir ◽  
Ir Absorption Spectra

Kinetics of cyclization of S-ethoxycarbonylmethylisothiouronium chloride to 2-imino-4-thiazolidone

1979 ◽  
Vol 44 (3) ◽  
pp. 912-917 ◽  
Author(s):  
Vladimír Macháček ◽  
Said A. El-bahai ◽  
Vojeslav Štěrba
Keyword(s):  
Hydrochloric Acid ◽  
Dilute Hydrochloric Acid ◽  
Base Catalysis ◽  
General Base ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Rate Limiting ◽  
Kinetics Of

Kinetics of formation of 2-imino-4-thiazolidone from S-ethoxycarbonylmethylisothiouronium chloride has been studied in aqueous buffers and dilute hydrochloric acid. The reaction is subject to general base catalysis, the β value being 0.65. Its rate limiting step consists in acid-catalyzed splitting off of ethoxide ion from dipolar tetrahedral intermediate. At pH < 2 formation of this intermediate becomes rate-limiting; rate constant of its formation is 2 . 104 s-1.

Cyclization and acid-catalyzed hydrolysis of O-benzoylbenzamidoximes

1986 ◽  
Vol 51 (12) ◽  
pp. 2786-2797
Author(s):  
František Grambal ◽  
Jan Lasovský
Keyword(s):  
Reaction Rate ◽  
Kinetic Isotope ◽  
Acid Base Equilibrium ◽  
Mineral Acids ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Ph Scale ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Derivatives Of

Kinetics of formation of 1,2,4-oxadiazoles from 24 substitution derivatives of O-benzoylbenzamidoxime have been studied in sulphuric acid and aqueous ethanol media. It has been found that this medium requires introduction of the Hammett H0 function instead of the pH scale beginning as low as from 0.1% solutions of mineral acids. Effects of the acid concentration, ionic strength, and temperature on the reaction rate and on the kinetic isotope effect have been followed. From these dependences and from polar effects of substituents it was concluded that along with the cyclization to 1,2,4-oxadiazoles there proceeds hydrolysis to benzamidoxime and benzoic acid. The reaction is thermodynamically controlled by the acid-base equilibrium of the O-benzylated benzamidoximes.

Effect of CTABr (surfactant) on the kinetics of formation of silver nanoparticles by Amla extract

2021 ◽  
Vol 329 ◽  
pp. 115537
Author(s):  
Nazia Iqbal ◽  
S.M. Shakeel Iqubal ◽  
Aejaz Abdullatif Khan ◽  
Tasneem Mohammed ◽  
Ali Mohamed Alshabi ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Kinetics Of Formation ◽  
Kinetics Of
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