Nanocell fabrication on GaSb at room temperature and cryogenic temperature

2012 ◽  
Author(s):  
Noriko Nitta ◽  
Kazuhiro Yokoyama ◽  
Masafumi Taniwaki
Keyword(s):  
Cryogenic Temperature ◽  
Room Temperature

Ferroelectric Tunability Studies in Doped BaTiO3 and Ba1−xSrxTiO3

2000 ◽  
Vol 658 ◽  
Author(s):  
Dong Li ◽  
M. A. Subramanian
Keyword(s):  
Curie Temperature ◽  
Phase Change ◽  
Tetragonal Phase ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Co Doping ◽  
Structure Changes

ABSTRACTAcceptor and Donor codoped BaTiO3 and Ba1−xSrxTiO3 are prepared. For Ba1−xLaxTi1−xFexO3,BaTiO3 remains as tetragonal phase up to about 5mol% LaFeO3. For x ≥0.06, the structure changes to cubic at room temperature. The phase change shifts the Curie temperature to lower value and increases the tunability at room temperature. Doping of other acceptor (Al, Cr) and donor (Sm, Gd, Dy) ions has the same effect although with varying levels of tuning. BaTiO3: 4%LaFeO3 has the highest tunability among the studied systems, which is even higher than Ba0.6Sr0.4TiO3. Co-doping of (La, Fe) and (La, Al) in Ba1−xSrxTiO3 also lowers the Curie temperature and increases the tunability of high Ba content samples at cryogenic temperature.

scholarly journals Microstructural Characterization and Mechanical Properties of L-PBF Processed 316 L at Cryogenic Temperature

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5856
Author(s):  
Pragya Mishra ◽  
Pia Åkerfeldt ◽  
Farnoosh Forouzan ◽  
Fredrik Svahn ◽  
Yuan Zhong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Mechanical Performance ◽  
Microstructural Characterization ◽  
Tensile Tests ◽  
Phase Changes ◽  
X Ray Diffraction ◽  
Temperature Range ◽  
Aerospace Applications

Laser powder bed fusion (L-PBF) has attracted great interest in the aerospace and medical sectors because it can produce complex and lightweight parts with high accuracy. Austenitic stainless steel alloy 316 L is widely used in many applications due to its good mechanical properties and high corrosion resistance over a wide temperature range. In this study, L-PBF-processed 316 L was investigated for its suitability in aerospace applications at cryogenic service temperatures and the behavior at cryogenic temperature was compared with room temperature to understand the properties and microstructural changes within this temperature range. Tensile tests were performed at room temperature and at −196 °C to study the mechanical performance and phase changes. The microstructure and fracture surfaces were characterized using scanning electron microscopy, and the phases were analyzed by X-ray diffraction. The results showed a significant increase in the strength of 316 L at −196 °C, while its ductility remained at an acceptable level. The results indicated the formation of ε and α martensite during cryogenic testing, which explained the increase in strength. Nanoindentation revealed different hardness values, indicating the different mechanical properties of austenite (γ), strained austenite, body-centered cubic martensite (α), and hexagonal close-packed martensite (ε) formed during the tensile tests due to mechanical deformation.

Tensile Properties of Clay/Polypropylene Nanocomposites at Cryogenic Temperature

2012 ◽  
Vol 488-489 ◽  
pp. 562-566
Author(s):  
S. Mohammad Reza Khalili ◽  
Neda Soleimani ◽  
Reza Eslami Farsani ◽  
Ziba Hedayatnasab
Keyword(s):  
Tensile Strength ◽  
Maleic Anhydride ◽  
Tensile Properties ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Melt Mixing ◽  
Clay Particles ◽  
Polypropylene Nanocomposites ◽  
Pp Composites ◽  
Compatibilizing Agent

In this paper, the polypropylene (PP)nanocomposites containing 1, 3 and 5 wt % of nanoclay particles are prepared via direct melt mixing in the presence of maleic anhydride grafted PP (PP-g-MA) as compatibilizing agent. PP-g-MA is known to facilitate the dispersion of clay particles in a nonpolar PP matrix and to increase the adhesion between PP and the clay particles.The effect of different nanoclay contents on the PP composites are investigated for tensile characterization at both room temperature(RT) and cryogenic temperature (CT).The results showed that the cryogenic tensile strength, Young’s modulus, percentage of displacement at break and the energy absorptionat cryogenic temperature are all enhanced ascompared to the neat PP by the addition of clay at appropriate contents

Effect of nanoclay concentration on the lap joint shear performance of nanoclay/epoxy adhesive at cryogenic condition

2017 ◽  
Vol 52 (18) ◽  
pp. 2477-2482 ◽  
Author(s):  
Hei-Lam Ma ◽  
Xiaoqing Zhang ◽  
Kin-tak Lau ◽  
San-qiang Shi
Keyword(s):  
Cryogenic Temperature ◽  
Room Temperature ◽  
Negative Thermal Expansion ◽  
Epoxy Adhesive ◽  
Lap Joints ◽  
Clamping Force ◽  
Lap Joint ◽  
Joint Shear Strength ◽  
Temperature Environment ◽  
Joint Shear

Nanoclay has been a popular kind of nanofiller for polymer-based nanocomposites in industries since adding a small amount of it can effectively enhance the mechanical properties of polymer. In the present study, a suitable sonication time was first found for manufacturing nanoclay/epoxy adhesive. Then, the lap joint shear strengths of nanoclay/epoxy adhesives with different nanoclay content (0, 1, 3, 5 wt%) conditioned at both room temperature and cryogenic temperature environment were investigated. The main failure mechanism of all samples was interfacial failure between the first layer of glass fiber and adhesive due to peeling. Results showed that 1 wt% was the optimal nanoclay concentration for cryogenic temperature. Scanning electron microcopy was used to examine the fracture surfaces of samples. Good exfoliation and dispersion were found in samples containing 1 wt% of nanoclay. Adding nanoclay into epoxy did not greatly affect the lap joint shear strength at room temperature but significantly influence the strength at cryogenic temperature. This was due to a clamping force induced on nanoclay by negative thermal expansion during conditioning from room temperature to cryogenic temperature. With good exfoliation and dispersion, the clamping force can be evenly distributed. Hence, 1 wt% nanoclay/epoxy adhesive is suitable for bonding composite lap joints, which will be servicing at low temperature environment.

Investigation upon Mechanical Properties of Thin Film Silicon Under Cryogenic Temperature

2004 ◽  
Vol 851 ◽  
Author(s):  
Yi Zhao ◽  
Xin Zhang
Keyword(s):  
Thin Film ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Cooling System ◽  
Michelson Interferometer ◽  
Experimental Setup ◽  
Good Match ◽  
Silicon Thin Film ◽  
Micro Raman Spectroscopy ◽  
Thin Film Silicon

ABSTRACTThin film silicon material has an extensive application in cooling satellite instrumentation under cryogenic environment. The performance and reliability of the cooling system heavily depends on mechanical behavior of the thin films. In this paper, we built an experimental setup and used compressive gas to actuate a silicon thin film under both room temperature and cryogenic temperature. The elastic modulus was derived from the film's deflection using laser Michelson interferometer. Stress distribution was obtained using Micro Raman spectroscopy. It was found that Young's modulus derived from the deflection increases with decreasing temperature. Compressive stress concentrated at edge centers of the film and tensile stress occurred at the center. There is a good match between the theoretical predications and experimental observations.

Tensile Properties and Deformation-Fracture Behavior of Ti-6Al-4V Alloy at Cryogenic Temperature

2007 ◽  
Vol 561-565 ◽  
pp. 207-210 ◽  
Author(s):  
Shang Li Dong ◽  
Y.C. Xin ◽  
G. Lu ◽  
D.Z. Yang ◽  
S.Y. He ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Cryogenic Temperature ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Testing Temperature ◽  
Alloy Sheet ◽  
Dislocation Slip ◽  
Solution Treated ◽  
Dominant Deformation Mechanism ◽  
Specimen Orientation

Tensile properties and deformation-fracture behavior at temperatures ranging from 123K to 293K of a Ti-6Al-4V alloy sheet with a thickness of 1.5mm has been studied, and the effects of testing temperature, specimen orientation and heat-treatment were investigated. An increase in strength and a decrease in fracture strain were found with decreasing tension temperature, and the anisotropy in tensile properties was observed at room and cryogenic temperatures both in the annealed and solution treated and aged (STA) specimens. TEM examinations indicated that plastic deformation occurred within both α and β phases in the STA specimens testing at either room or cryogenic temperature. The dominant deformation mechanism varied from dislocation slip at room temperature to twinning at 123K. SEM observations showed that the amount of dimples and tearing grains on fractured surfaces of the specimens decreased as testing temperature was decreased.

Carbon Fiber Reinforced Graphene Nanocomposite to Enhance Fracture Toughness for Cryogenic Application

2012 ◽  
Author(s):  
Adam McLaughlin ◽  
Je Kyun Lee ◽  
Sangyup Song ◽  
Byungki Kim
Keyword(s):  
Fracture Toughness ◽  
Carbon Fiber ◽  
Mass Fraction ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Fiber Composite ◽  
Exfoliated Graphite ◽  
Carbon Fiber Composite ◽  
Graphene Nanocomposite ◽  
Cryogenic Application

This paper presents the fracture toughness, KIC, of a carbon fiber composite reinforced with the nanoparticle known as exfoliated graphite or graphene at room temperature and at cryogenic temperature. The measured KIC increased as mass fraction of graphene increase at room temperature and at cryogenic temperature for the composite with mass fraction of graphene of 0, 0.01, 0.1, 0.7, and 0.8.

scholarly journals Infrared Absorption and Its Sources of CdZnTe at Cryogenic Temperature

2022 ◽  
Author(s):  
Hiroshi Maeshima ◽  
Kosei Matsumoto ◽  
Yasuhiro Hirahara ◽  
Takao Nakagawa ◽  
Ryoichi Koga ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Infrared Absorption ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Wavelength Region ◽  
Room Temperature Resistivity ◽  
Absorption Model ◽  
Acceptor Level ◽  
Absorption Coefficients ◽  
Temperature Resistivity

AbstractTo reveal the causes of infrared absorption in the wavelength region between electronic and lattice absorptions, we measured the temperature dependence of the absorption coefficient of p-type low-resistivity ($$\sim 10^2~ \Omega \mathrm{cm}$$ ∼ 10 2 Ω cm ) CdZnTe crystals. We measured the absorption coefficients of CdZnTe crystals in four wavelength bands ($$\lambda =6.45$$ λ = 6.45 , 10.6, 11.6, 15.1$$~\mu $$ μ m) over the temperature range of $$T=8.6$$ T = 8.6 -300 K with an originally developed system. The CdZnTe absorption coefficient was measured to be $$\alpha =0.3$$ α = 0.3 -0.5 $$\mathrm{cm}^{-1}$$ cm - 1 at $$T=300$$ T = 300 K and $$\alpha =0.4$$ α = 0.4 -0.9 $$\mathrm{cm}^{-1}$$ cm - 1 at $$T=8.6$$ T = 8.6 K in the investigated wavelength range. With an absorption model based on transitions of free holes and holes trapped at an acceptor level, we conclude that the absorption due to free holes at $$T=150$$ T = 150 -300 K and that due to trapped-holes at $$T<50$$ T < 50 K are dominant absorption causes in CdZnTe. We also discuss a method to predict the CdZnTe absorption coefficient at cryogenic temperature based on the room-temperature resistivity.

Constitutive Modeling with Critical Twinning Stress in CoCrFeMnNi High Entropy Alloy at Cryogenic Temperature and Room Temperature

2020 ◽  
Author(s):  
Yongju Kim ◽  
Hyung Keun Park ◽  
Peyman Asghari-Rad ◽  
Jaimyun Jung ◽  
Jongun Moon ◽  
...  
Keyword(s):  
Constitutive Modeling ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
High Entropy Alloy ◽  
High Entropy

DC Breakdown Strength of ZnO/GFRP at Room Temperature and Cryogenic Temperature

2021 ◽  
Author(s):  
Peng Jia ◽  
Rongjin Huang ◽  
Dong Xu ◽  
Yongguang Wang ◽  
Zhicong Miao ◽  
...  
Keyword(s):  
Cryogenic Temperature ◽  
Room Temperature ◽  
Breakdown Strength
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