Infrared Spectroscopy of Intersitial Oxygen in Silicon

1985 ◽  
Vol 59 ◽  
Author(s):  
Bernard Pajot ◽  
Bernard Cales
Keyword(s):  
Infrared Spectroscopy ◽  
Low Temperature ◽  
Temperature Dependence ◽  
Liquid Helium ◽  
Isotope Shift ◽  
Room Temperature ◽  
Interstitial Oxygen ◽  
Helium Temperature ◽  
Temperature Spectrum ◽  
Weak Band

ABSTRACTA discussion of the isotope shift of the low temperature spectrum of the stretching mode of interstitial oxygen (Oi) in silicon introduces IR results showing the interaction of Oi with the silicon lattice. Evidence is given that the temperature dependence of a combination band observed at liquid helium temperature (LHT) at 1205.7 cm−1 is responsible for the room temperature (RT) band at 1227 cm−1 and that a weak band near 1013 cm−1 is an overtone of the 518 cm−1 band.

scholarly journals Low-Temperature Properties of the Magnetic Sensor with Amorphous Wire

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6986
Author(s):  
Dongfeng He ◽  
Kensei Umemori ◽  
Ryuichi Ueki ◽  
Takeshi Dohmae ◽  
Takafumi Okada ◽  
...  
Keyword(s):  
Low Temperature ◽  
Liquid Helium ◽  
Room Temperature ◽  
Magnetic Sensor ◽  
Liquid Helium Temperature ◽  
Coaxial Cable ◽  
Amorphous Wire ◽  
Helium Temperature ◽  
Sensing Element ◽  
The One

We found that a magnetic sensor made of a coil wound around a 5 f0.1 mm (Fe0.06Co0.94)72.5Si2.5B15 (FeCoSiB) amorphous wire could operate in a wide temperature range from room temperature to liquid helium temperature (4.2 K). The low-temperature sensing element of the sensor was connected to the room-temperature driving circuit by only one coaxial cable with a diameter of 1 mm. The one-cable design of the magnetic sensor reduced the heat transferring through the cable to the liquid helium. To develop a magnetic sensing system capable of operating at liquid helium temperature, we evaluated the low-temperature properties of the FeCoSiB magnetic sensor.

scholarly journals Metallicity and Superconductivity in Doped Strontium Titanate

2019 ◽  
Vol 10 (1) ◽  
pp. 25-44 ◽  
Author(s):  
Clément Collignon ◽  
Xiao Lin ◽  
Carl Willem Rischau ◽  
Benoît Fauqué ◽  
Kamran Behnia
Keyword(s):  
Liquid Helium ◽  
Free Path ◽  
Coulomb Interaction ◽  
Strontium Titanate ◽  
Room Temperature ◽  
Mean Free Path ◽  
Helium Temperature ◽  
Ongoing Research ◽  
Low Concentrations ◽  
Wide Gap

Strontium titanate is a wide-gap semiconductor avoiding a ferroelectric instability thanks to quantum fluctuations. This proximity leads to strong screening of static Coulomb interaction and paves the way for the emergence of a very dilute metal with extremely mobile carriers at liquid-helium temperature. Upon warming, mobility decreases by several orders of magnitude. Yet, metallicity persists above room temperature even when the apparent mean free path falls below the electron wavelength. The superconducting instability survives at exceptionally low concentrations and beyond the boundaries of Migdal–Eliashberg approximation. An intimate connection between dilute superconductivity and aborted ferroelectricity is widely suspected. In this review, we give a brief account of ongoing research on bulk strontium titanate as an insulator, a metal, and a superconductor.

scholarly journals TEMPERATURE DEPENDENCE OF CONDUCTIVITYOF UREASE DOPED POLYPYRROLE MATERIAL

2021 ◽  
Vol 9 (6) ◽  
pp. 85-90
Author(s):  
Munish Pandey ◽  
Richa Badlani
Keyword(s):  
Infrared Spectroscopy ◽  
Temperature Dependence ◽  
Room Temperature ◽  
Chemical Oxidation ◽  
Oxidation Method ◽  
Temperature Range ◽  
The Matrix

In polymerization of was carried out in the presence of to synthesize – composites by chemical oxidation method. The / have been synthesized with various compositions (10, 15, 20, 25 and 30 ) of in in aquas medium at room temperature. The – composites were characterized by infrared spectroscopy (IR). The d.c. conductivity was studied in the temperature range from 40–100°C. The dimensions of in the matrix have a greater influence on the observed conductivity values.

scholarly journals Assignment for the Infrared Spectrum of Solid Sodium Propionate from Low-Temperature Measurements in Combination with 13C Isotopic Shifts

1987 ◽  
Vol 42 (5) ◽  
pp. 477-484 ◽  
Author(s):  
Masato Kakihana ◽  
Tadashi Nagumo
Keyword(s):  
Low Temperature ◽  
Infrared Spectrum ◽  
Room Temperature ◽  
Liquid Nitrogen Temperature ◽  
Sodium Propionate ◽  
Coupled Modes ◽  
Temperature Spectrum ◽  
Isotopic Shifts ◽  
Complete Assignment ◽  
Room Temperature Spectrum

The infrared spectra of CH3CH2COONa and its 13C-labeled modifications (1-13C, 2-13C, and 3-13C) suspended in KBr disks were measured in the region 4000 -200 cm-1 at room temperature and liquid nitrogen temperature. Overlapping complex band contours appeared in some regions of the room temperature spectrum, most notably in the region 1500 -1350 cm-1, where 5 fundamentals having contributions from the methyl deformation, methylene bending, and carboxylate stretching modes should occur. In contrast to this, excellent resolution was reached at the low temperature, from which all 22 fundamentals expected in the whole spectral region investigated were detected. A complete assignment of the fundamentals is proposed mainly on the basis of the characteristic isotopic shifts of the three 13C substituted sodium propionate species. A fair number of the fundamentals were found to feature coupled modes having contributions from several group vibrations.

Nondestructive Compositional and Defect Characterization of CdZnTe Alloys Using Photoluminescence Spectroscopy

1989 ◽  
Vol 161 ◽  
Author(s):  
W.M. Duncan ◽  
R.J. Koestner ◽  
J.H. Tregilgas ◽  
H.-Y. Liu ◽  
M.-C. Chen
Keyword(s):  
High Resolution ◽  
Low Temperature ◽  
Point Defect ◽  
Impurity Concentration ◽  
Room Temperature ◽  
Precise Determination ◽  
Defect Characterization ◽  
Helium Temperature ◽  
Composition Determination

ABSTRACTResults from high resolution helium temperature photoluminescence (PL) spectroscopy have been correlated to precision lattice constant and transport measurements and to theoretical band gap versus composition behavior. It is found that low temperature PL spectra provide precise determination (+/- 0.02%) of ZnTe mole fraction as well as carrier type, relative impurity concentration and point defect properties of these substrates. In addition helium and room temperature PL results are correlated to determine the accuracy of room temperature measurements for composition determination.

6H-Type Zigzag Faults in Low-Doped 4H-SiC Epitaxial Layers

2010 ◽  
Vol 645-648 ◽  
pp. 347-350 ◽  
Author(s):  
Teddy Robert ◽  
Maya Marinova ◽  
Sandrine Juillaguet ◽  
Anne Henry ◽  
Efstathios K. Polychroniadis ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Low Temperature ◽  
Liquid Helium ◽  
Helium Temperature ◽  
Transmission Electron ◽  
Unit Cells ◽  
New Type ◽  
Low Temperature Photoluminescence

A new type of 6H zigzag faults has been identified from high resolution transmission electron microscopy (HRTEM) measurements performed on low-doped 4H-SiC homoepitaxial layer grown on off-axis substrates in a hot-wall CVD reactor. They are made of half unit cells of 6H with corresponding low temperature photoluminescence (LTPL) response ranging from about 3 eV to 2.5 eV at liquid helium temperature.

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