scholarly journals Узкозонные гетероструктуры InAs-=SUB=-1-y-=/SUB=-Sb-=SUB=-y-=/SUB=-/InAsSbP (y=0.09-0.16) для спектрального диапазона 4-6 μm, полученные методом МОГФЭ

2019 ◽  
Vol 61 (10) ◽  
pp. 1746
Author(s):  
В.В. Романов ◽  
Э.В. Иванов ◽  
К.Д. Моисеев
Keyword(s):  
Solid Solution ◽  
Low Temperature ◽  
Active Layer ◽  
Radiative Recombination ◽  
Room Temperature ◽  
Composition Range ◽  
Narrow Gap ◽  
Spectral Maximum ◽  
Antimony Content ◽  
Metalorganic Compounds

AbstractAsymmetric n -InAs/InAs_(1 – _ y )Sb_ y / p -InAsSbP heterostructures with a narrow-gap active layer and a composition range y = 0.09–0.16 were grown by vapor phase epitaxy from metalorganic compounds. Room-temperature electroluminescence was observed at a wavelength of up to λ = 5.1 μm at a spectral maximum. The study of low-temperature electroluminescence spectra provided the possibility to establish the existence of two radiative recombination channels caused by the nature of the InAsSb/InAsSbP heterointerface. The effect produced by the chemistry of the active layer on the composition of the grown barrier layer and the formation of the InAsSb/InAsSbP heterojunction with an increase in the antimony content in the InAsSb solid solution was demonstrated.

scholarly journals Interface Resistance of an SOFC Cathode with a Pr1-xTbxO2-d Active Layer

2021 ◽  
Author(s):  
Reiichi Chiba ◽  
Rin Kawaguchi ◽  
Kazuma Horie
Keyword(s):  
Phase Transition ◽  
Solid Solution ◽  
Active Layer ◽  
Room Temperature ◽  
Single Phase ◽  
Fluorite Structure ◽  
Impedance Method ◽  
Sofc Cathode ◽  
Interface Resistance ◽  
Better Than

Abstract We investigated the use of Pr1-xTbxO2-d (x=0.0-1.0) material for active layer in SOFC cathode. Pr1-xTbxO2-d (x=0.0-1.0) in single-phase fluorite structure were successfully synthesized. They are solid solution of Pr6O11 and Tb4O7. When the x is between 0.3 and 0.6, the phase transition between room temperature and 800oC were eliminated Coin cells with GDC electrolyte and Pr1-xTbxO2-d (x=0.0-1.0) active layer and LaNi0.6Fe0.4O3 (LNF) current collecting layer were made to clarify the effect of this active layer. The interface resistance of these cathodes was measured with an AC impedance method at 800oC. The cathodes withPr1-xTbxO2-d (for all composition) active layer performed better than that of reference cathode, which has no active layer (consisting only LNF layer).

Thermoelectric Properties of the Cubic Family of Compounds AgPbBiQ3 (Q = S, Se, Te). Very Low Thermal Conductivity Materials

1998 ◽  
Vol 545 ◽  
Author(s):  
S. Sportouch ◽  
M. Basteat ◽  
P. Brazis ◽  
J. Ireland ◽  
C. R. Kannewurf ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Solid Solution ◽  
Electrical Conductivity ◽  
Charge Transport ◽  
Transport Properties ◽  
Room Temperature ◽  
Structure Type ◽  
Band Gaps ◽  
Narrow Gap ◽  
Static Vacuum

AbstractThe AgPbBiQ3 class of compounds and their solid solution members are related to the NaCl structure type, where Ag, Pb and Bi atoms are statistically disordered on the Na site and Q atoms occupy the Cl site. These compounds were synthesized by combining the elements in the appropriate ratio and heating under static vacuum at 900° C for 3 days. They are narrow gap semiconductors with band gaps in the range of 0.6 to 0.28 eV. The charge-transport properties were measured on ingots as a function of temperature. The compounds AgPbBiTe3, AgPbBiSe3, AgPbBiTe2.75Se0.25and AgPbBiTe2Se, undoped, possess an electrical conductivity in the range of 70 S/cm to 400 S/cm. These materials exhibit negative thermopower ranging from -40 μV/K to -160 μV/K at room temperature and thermal conductivity less than 1.30 W/mK.

Photoluminescence and Photoacoüstic Spectroscopy of Si Single-and Multi-Step Ingot- and Wafer-Annealed GaAs Crystals

1992 ◽  
Vol 262 ◽  
Author(s):  
O. Ka ◽  
O. Oda ◽  
S. Shigetomi ◽  
T. Ikari ◽  
Y. Makita ◽  
...  
Keyword(s):  
Low Temperature ◽  
Photoacoustic Spectroscopy ◽  
Radiative Recombination ◽  
Room Temperature ◽  
Defect Density ◽  
Band Edge ◽  
Near Band Edge ◽  
Exciton Recombination ◽  
Additional Defect ◽  
Neutral Acceptor

ABSTRACTSI GaAs crystals submitted to single- or multi-step, ingot-or wafer-annealing are investigated using photoluminescence (PL) and photoacoustic spectroscopy (PA). The near-band-edge PL transitions are well resolved, with a neutral acceptor-bound exciton recombination displayed as a split doublet. The improvement induced by wafer-annealing is illustrated by the absence of additional defect-related transitions found after ingot-annealing. For the room temperature PA measurements, the intensity of a peak occuring at 1.39 eV is shown to lead to an estimation of the arsenic micro-defect density as evaluated by AB etching. The 1.39 eV PA band is also asserted to be the non-radiative recombination path of a 1.482 eV band found in the low-temperature PL spectra.

Low temperature SR-XRPD study of åkermanite-gehlenite solid solution

2006 ◽  
Vol 2006 (suppl_23_2006) ◽  
pp. 419-424 ◽  
Author(s):  
M. Merlini ◽  
M. Gemmi ◽  
G. Artioli
Keyword(s):  
Solid Solution ◽  
Low Temperature

Survival of mouse blastocysts after low-temperature preservation under high pressure

2004 ◽  
Vol 52 (4) ◽  
pp. 479-487 ◽  
Author(s):  
Cs. Pribenszky ◽  
M. Molnár ◽  
S. Cseh ◽  
L. Solti
Keyword(s):  
Phase Transition ◽  
Hydrostatic Pressure ◽  
Low Temperature ◽  
High Hydrostatic Pressure ◽  
Room Temperature ◽  
Freezing Point ◽  
Significant Loss ◽  
Embryo Cryopreservation ◽  
Subzero Temperatures ◽  
Survival Capacity

Cryoinjuries are almost inevitable during the freezing of embryos. The present study examines the possibility of using high hydrostatic pressure to reduce substantially the freezing point of the embryo-holding solution, in order to preserve embryos at subzero temperatures, thus avoiding all the disadvantages of freezing. The pressure of 210 MPa lowers the phase transition temperature of water to -21°C. According to the results of this study, embryos can survive in high hydrostatic pressure environment at room temperature; the time embryos spend under pressure without significant loss in their survival could be lengthened by gradual decompression. Pressurisation at 0°C significantly reduced the survival capacity of the embryos; gradual decompression had no beneficial effect on survival at that stage. Based on the findings, the use of the phenomena is not applicable in this form, since pressure and low temperature together proved to be lethal to the embryos in these experiments. The application of hydrostatic pressure in embryo cryopreservation requires more detailed research, although the experience gained in this study can be applied usefully in different circumstances.

Microstructure and Friction of Ion Beam Induced Amorphous Ti-Pd Alloys

1985 ◽  
Vol 55 ◽  
Author(s):  
J-P. Hirvonen ◽  
M. Nastasi ◽  
J. R. Phillips ◽  
J. W. Mayer
Keyword(s):  
Solid Solution ◽  
Friction Coefficient ◽  
Composition Range ◽  
Ion Beam ◽  
Amorphous Region ◽  
Transmission Electron ◽  
Solid Solution Region ◽  
Friction Measurements ◽  
Solution Region ◽  
High Equilibrium

ABSTRACTMultilayered samples of Ti-Pd with linearly varying compositions were irradiated by Xe ions at 600 keV. The induced microstructures were studied by using transmission electron microscopy and Rutherford backscattering. Mixing was found to be complete over the entire composition range, resulting in amorphous or amorphous plus crystalline structures except at the palladium-rich end, where a crystalline Pd-Ti solid solution was obtained. This is consistent with the high equilibrium solubility of Ti in Pd. In addition, significant coarsening of the microstructure caused by irradiation was found in this solid solution region.Friction measurements were carried out in air and water by using a polytetrafluoroethylene pin as a counterpart. In air the friction coefficient was independent of composition and microstructure after about 2000 passes. In water, however, after 600 passes the friction coefficient reached a steady-state value with a pronounced minimum over the amorphous region. This property was unchanged throughout the remaining 10000 passes.

scholarly journals Preparation of Li3PS4–Li3PO4 Solid Electrolytes by Liquid-Phase Shaking for All-Solid-State Batteries

2021 ◽  
Vol 2 (1) ◽  
pp. 39-48
Author(s):  
Nguyen H. H. Phuc ◽  
Takaki Maeda ◽  
Tokoharu Yamamoto ◽  
Hiroyuki Muto ◽  
Atsunori Matsuda
Keyword(s):  
Solid Solution ◽  
Solid State ◽  
Liquid Phase ◽  
Room Temperature ◽  
Reaction Medium ◽  
Magic Angle Spinning ◽  
Resonance Spectroscopy ◽  
Synthesis Methods ◽  
Magic Angle ◽  
Angle Spinning

A solid solution of a 100Li3PS4·xLi3PO4 solid electrolyte was easily prepared by liquid-phase synthesis. Instead of the conventional solid-state synthesis methods, ethyl propionate was used as the reaction medium. The initial stage of the reaction among Li2S, P2S5 and Li3PO4 was proved by ultraviolet-visible spectroscopy. The powder X-ray diffraction (XRD) results showed that the solid solution was formed up to x = 6. At x = 20, XRD peaks of Li3PO4 were detected in the prepared sample after heat treatment at 170 °C. However, the samples obtained at room temperature showed no evidence of Li3PO4 remaining for x = 20. Solid phosphorus-31 magic angle spinning nuclear magnetic resonance spectroscopy results proved the formation of a POS33− unit in the sample with x = 6. Improvements of ionic conductivity at room temperature and activation energy were obtained with the formation of the solid solution. The sample with x = 6 exhibited a better stability against Li metal than that with x = 0. The all-solid-state half-cell employing the sample with x = 6 at the positive electrode exhibited a better charge–discharge capacity than that employing the sample with x = 0.

Photophysical properties of N719 and Z907 dyes, benchmark sensitizers for dye-sensitized solar cells, at room and low temperature

2021 ◽  
Vol 23 (10) ◽  
pp. 6182-6189
Author(s):  
Dariusz M. Niedzwiedzki
Keyword(s):  
Solar Cells ◽  
Low Temperature ◽  
Optical Spectroscopy ◽  
Room Temperature ◽  
Photophysical Properties ◽  
Dye Sensitized Solar Cells ◽  
Time Resolved ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Photophysical properties of N719 and Z907, benchmark Ru-dyes used as sensitizers in dye-sensitized solar cells, were studied by static and time-resolved optical spectroscopy at room temperature and 160 K.

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