Characterization of SnS films prepared by constant-current electro-deposition

2006 ◽  
Vol 500 (1-2) ◽  
pp. 96-100 ◽  
Author(s):  
Shuying Cheng ◽  
Yanqing Chen ◽  
Cichang Huang ◽  
Guonan Chen
Keyword(s):  
Constant Current ◽  
Electro Deposition

Electrical Characterization of Oxynitrided Gate Dielectrics under Constant‐Current Fowler‐Nordheim Stress

1997 ◽  
Vol 144 (9) ◽  
pp. 3299-3304 ◽  
Author(s):  
T. K. Nguyen ◽  
L. M. Landsberger ◽  
S. Belkouch ◽  
C. Jean
Keyword(s):  
Gate Dielectrics ◽  
Electrical Characterization ◽  
Constant Current

Preparation and Electrochemical Characterization of Mn/Pb Composite Oxides for Supercapacitors

2007 ◽  
Vol 336-338 ◽  
pp. 470-473
Author(s):  
Zhian Zhang ◽  
Yan Qing Lai ◽  
Jie Li ◽  
Ye Xiang Liu
Keyword(s):  
Specific Capacitance ◽  
Electrochemical Characterizations ◽  
Amorphous Structure ◽  
Electrode System ◽  
Constant Current ◽  
Manganese Acetate ◽  
Composite Oxides ◽  
Constant Current Charge ◽  
Nano Size

Mn/Pb composite oxides were prepared by solid-state reaction by KMnO4 with manganese acetate and lead acetate at low temperature. The products were characterized by XRD and TEM. The results show that the composite oxides are nano-size and amorphous structure. Electrochemical characterizations were performed by cyclic voltammetry (CV) and constant current charge-discharge in a three-electrode system. The potential windows of Mn/Pb composite oxides electrode are increased. With increasing the ratio of Pb, the specific capacitance goes through a maximum at 20% mol Pb. The specific capacitance of pure MnO2 is 158 F/g and is improved to 180 F/g for the Mn0.8Pb0.2Ox composite oxide by constant current discharge.

Characterization of Er/O-doped Si-LEDs with Low Thermal Quenching

2005 ◽  
Vol 866 ◽  
Author(s):  
A. Karim ◽  
W.-X. Ni ◽  
A. Elfving ◽  
P.O.Å. Persson ◽  
G.V. Hansson
Keyword(s):  
Temperature Dependence ◽  
Reverse Bias ◽  
Thermal Quenching ◽  
Constant Current ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Low Energy Electrons ◽  
Higher Temperature ◽  
Electron Emitters

AbstractElectroluminescence studies of MBE-grown Er/O-doped Si-diodes at reverse bias have been done. For some devices there is much reduced thermal quenching of the emission at 1.54 νm. There are examples where the temperature dependence is abnormal in that the intensity for a constant current even increases with temperature up to e.g. 80 °C. These devices have been studied with cross-sectional transmission electron microscopy to see the microstructure of the Er/O-doped layers as well as the B-doped SiGe-layers that are used as electron emitters during reverse bias. Although there are defects in the layers there is no evidence for large thick precipitates of SiO2. While reduced thermal quenching often is attributed to having the Er-ions within SiO2 layers, this is not the case for our structures as evidenced by our TEM-studies. The origin of the abnormal temperature dependence is attributed to the two mechanisms of breakdown in the reverse-biased diodes. At low temperature the breakdown current is mainly due to avalanche resulting in low-energy electrons and holes that quenches the intensity by Auger deexcitation of the Er-ions. At higher temperature the breakdown current is mainly phonon-assisted tunneling which results in a more efficient pumping with less de-excitation of the Er-ions. Finally at the highest temperatures the thermal quenching sets in corresponding to an activation energy of 125 meV, which is slightly lower than 150 meV that has been reported in other studies.

Characterization of Microstructure and Composition of Plasma Electrolytic Oxide Film Formed on AZ31 Mg Alloy

2020 ◽  
Vol 860 ◽  
pp. 213-217
Author(s):  
Efrina Hidayati ◽  
Anawati Anawati
Keyword(s):  
Degradation Rate ◽  
High Surface ◽  
Mg Alloy ◽  
Constant Current ◽  
X Ray Diffraction ◽  
Time Curve ◽  
Biodegradable Implant ◽  
Az31 Mg Alloy ◽  
Plasma Electrolytic

Magnesium alloy has been widely investigated as a biodegradable implant material owing to its unique properties to degrade spontaneously in human body fluid without causing toxicity. However, the degradation rate needs to be controlled. An effective way to lower down the degradation rate of Mg alloy is by coating with plasma electrolytic oxidation (PEO) technique. In this research, the microstructure and mechanical hardness of the PEO film formed on AZ31 were investigated. The film was prepared under a constant current of 400 A/m2 in the Na3PO4 solution at 30°C. The voltage-time curve showed an immediate increase of current during the first 25 s before reaching a steady-state voltage of 150 V. The spark discharge revealed as white micro discharges. The film formed for 3 min exhibited a high surface roughness with a large variety of thickness in the range of 1-20 µm. The film contained pores and cracks. The big pores with diameter size 10-20 µm were formed as a result of gas entrapment, while the small pores with a radius of 1-3 µm were associated with the discharge tunnel during the PEO process. The X-ray diffraction pattern indicated that the film composed of crystalline Mg3(PO4)2.

Mechanical Characterization of Close Cell Aluminum Foams Reinforced by High Voltages Electro-deposition

2019 ◽  
Vol 34 (3) ◽  
pp. 541-548
Author(s):  
Yiku Xu ◽  
Lei Yang ◽  
Xuding Song ◽  
Yongnan Chen ◽  
Xuan Peng ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Aluminum Foams ◽  
Electro Deposition

Mechanical characterization of open cell aluminium foams reinforced by nickel electro-deposition

2015 ◽  
Vol 86 ◽  
pp. 272-278 ◽  
Author(s):  
C. Devivier ◽  
V. Tagliaferri ◽  
F. Trovalusci ◽  
N. Ucciardello
Keyword(s):  
Mechanical Characterization ◽  
Open Cell ◽  
Electro Deposition

Synthesis and Characterization of Nano Mn3O4 for Lithium-Ion Batteries

2014 ◽  
Vol 687-691 ◽  
pp. 4331-4334
Author(s):  
Han Ping Zhu ◽  
Peng Ding ◽  
Song Fang ◽  
Hailin Liu
Keyword(s):  
Discharge Capacity ◽  
Current Density ◽  
Solvothermal Method ◽  
Lithium Ion ◽  
Constant Current ◽  
Initial Discharge Capacity ◽  
Initial Discharge ◽  
Structure Morphology ◽  
Specific Discharge

nanoMn3O4was prepared by a simple solvothermal method. The structure, morphology and electrochemical properties of the products were investigated by XRD, SEM and constant current discharge-charge test. The results of XRD and SEM shows that nanoMn3O4is high-purity, and it’s diameter is about 30 nm. It could deliver an initial discharge capacity of 1324.4 mAh g-1at the current density of 25.5 mA g-1, and the specific discharge capacity is 586.9 mAh g-1after 30 cycles at the current density of 30.4 mA g-1.

Sign in / Sign up

Export Citation Format

Share Document