Synthesis of an Fe Rich Amorphous Structure with a Catalytic Effect To Rapidly Decolorize Azo Dye at Room Temperature

2014 ◽  
Vol 6 (8) ◽  
pp. 5500-5505 ◽  
Author(s):  
Peng Liu ◽  
Ji Liang Zhang ◽  
Mei Qin Zha ◽  
Chan Hung Shek
Keyword(s):  
Azo Dye ◽  
Room Temperature ◽  
Catalytic Effect ◽  
Amorphous Structure

Spherulite Structures in a Melt Spun Fe-Ni Austenitic Steel

1985 ◽  
Vol 43 ◽  
pp. 52-53
Author(s):  
G. M. Michal ◽  
T. K. Glasgow ◽  
T. J. Moore
Keyword(s):  
Austenitic Steel ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Large Range ◽  
Amorphous Structure ◽  
Nucleation And Growth ◽  
Ni Alloys ◽  
Melt Spun ◽  
Crystal Fibers ◽  
Rapidly Solidified

Large additions of B to Fe-Ni alloys can lead to the formation of an amorphous structure, if the alloy is rapidly cooled from the liquid state to room temperature. Isothermal aging of such structures at elevated temperatures causes crystallization to occur. Commonly such crystallization pro ceeds by the nucleation and growth of spherulites which are spherical crystalline bodies of radiating crystal fibers. Spherulite features were found in the present study in a rapidly solidified alloy that was fully crysstalline as-cast. This alloy was part of a program to develop an austenitic steel for elevated temperature applications by strengthening it with TiB2. The alloy contained a relatively large percentage of B, not to induce an amorphous structure, but only as a consequence of trying to obtain a large volume fracture of TiB2 in the completely processed alloy. The observation of spherulitic features in this alloy is described herein. Utilization of the large range of useful magnifications obtainable in a modern TEM, when a suitably thinned foil is available, was a key element in this analysis.

New method for the production of bulk amorphous materials of Nd–Fe–B alloys

2005 ◽  
Vol 20 (3) ◽  
pp. 563-566 ◽  
Author(s):  
Tetsuji Saito ◽  
Hiroyuku Takeishi ◽  
Noboru Nakayama
Keyword(s):  
Electron Microscopy ◽  
Amorphous Materials ◽  
Room Temperature ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Bulk Materials ◽  
X Ray ◽  
Transmission Electron ◽  
Melt Spun ◽  
Melt Spun Ribbons

We report a new compression shearing method for the production of bulk amorphous materials. In this study, amorphous Nd–Fe–B melt-spun ribbons were successfully consolidated into bulk form at room temperature by the compression shearing method. X-ray diffraction and transmission electron microscopy studies revealed that the amorphous structure was well maintained in the bulk materials. The resultant bulk materials exhibited the same magnetic properties as the original amorphous Nd–Fe–B materials.

High Temperature Properties of CoFe/CoNi and Fe/CoNi Biphase Microwires

2015 ◽  
Vol 233-234 ◽  
pp. 265-268 ◽  
Author(s):  
Irene Iglesias ◽  
Rhimou El Kammouni ◽  
Kseniay Chichay ◽  
Manuel Vazquez ◽  
Valeria Rodionova
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Single Phase ◽  
Amorphous Structure ◽  
Magnetic Behaviour ◽  
Heating Process ◽  
Saturation Magnetostriction ◽  
Magnetostriction Constant ◽  
Different Temperatures ◽  
Drawing Technique

The objective of this work has been to analyze the high-temperature behavior of magnetically single-and biphase microwires because of its interest from fundamental and applications viewpoints. Two alloy compositions with amorphous structure covered by glass have been prepared as magnetically single phase microwires by quenching & drawing technique: CoFe-based with near zero saturation magnetostriction constant and Fe-based with positive saturation magnetostriction constant. The same wires were used as the core for magnetically biphase microwires. Second CoNi phase was deposited by electroplating. Magnitudes as saturation magnetization and hysteresis parameters are determined in the temperature range from room temperature up to 1200 K. We proceed to a comparative analysis of their magnetic behaviour at different temperatures as well as after cooling down to room temperature. Information on the Curie temperature of different phases and on the influence of heating process on the magnetic properties is thus derived.

scholarly journals Thin Film Al-Al2O3-Al Capacitors With Dielectric Layer Formed at 400℃

1980 ◽  
Vol 6 (3-4) ◽  
pp. 219-222
Author(s):  
S. J. Osadnik ◽  
T. Berlicki
Keyword(s):  
Thin Film ◽  
Room Temperature ◽  
Amorphous Structure ◽  
Accelerated Life Test ◽  
Constant Current ◽  
Life Test ◽  
Oxide Interface ◽  
Electrical Field ◽  
Common Solution ◽  
Accelerated Life

A comparative study is made of Al2O3layers formed at 400℃ in molten KNO3and Al2O3formed at room temperature in a common solution of ammonium pentaborate in ethylene glycol. At 400℃ and constant current (0.5 mA/cm2) the linear anodization range is limited to 2.7 V by scintillation and local oxide breakdowns. Nonporous 200 Å thick (0.4μF/cm2) oxide layers were produced at 2.0 V (400℃) and 8 V (20℃). Electron diffraction indicated aγ-Al2O3structure at an anodization temperature of 400℃ and amorphous structure at room anodization temp. The initial values of tanδwere100 · 10−4 ± 40 · 10−4and400 · 10−4 ± 200 · 10−4respectively.Capacitance and tanδmeasurements during accelerated life test indicated that the films produced at 400℃ are not superior to those formed at room temperature. In both cases a diffusion of metal at the metal-oxide interface seems to be the main ageing mechanism.The internal electrical field measured by the C-V method was unchanged inγ-Al2O3layers during the life test.

Oxygenated CdS Window Layer for Sputtered CdS/CdTe Solar Cells

2003 ◽  
Vol 763 ◽  
Author(s):  
Akhlesh Gupta ◽  
Karthikeya Allada ◽  
Sung Hyun Lee ◽  
Alvin D. Compaan
Keyword(s):  
Absorption Edge ◽  
Room Temperature ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Blue Shift ◽  
Amorphous Structure ◽  
Window Layer ◽  
Cdte Solar Cells ◽  
Temperature Deposition ◽  
Deposited Films

AbstractIt is known that carriers photogenerated in the polycrystalline CdS layer of a CdS/CdTe cell are not collected. Thus, the short-circuit current (JSC) of CdS/CdTe devices should be improved if the bandgap of CdS is increased to permit better blue response. Wu, et al, showed that alloying of CdS with oxygen can increase the absorption edge of the layer. We report here on studies of this ‘oxygenated’ CdS and its use in sputtered cells. We find that at a deposition temperature of 250°C the addition of O2 to the sputter gas results in a red shift of the absorption edge (from 2.35 eV to 1.94 eV), but that room temperature deposition gives a blue shift (from 2.36 eV to 3.28 eV). The Raman spectra of the room temperature deposited films show a considerable broadening of LO phonon peaks suggesting a micro- to nano- to amorphous transition as the O2 fraction increases. XRD measurements of these films confirm the formation of an amorphous structure at high O2 fractions. The quantum efficiency measurements of CdS/CdTe device with room temperature deposited oxy-CdS show an improvement in blue response and hence increased JSC, but are accompanied by poorer junction quality so that the overall efficiency is not increased.

Ultra-sensitive solid substrate-room temperature phosphorimetry for colchicine detection based on its catalytic effect on H2O2 oxidation of acridine yellow

2014 ◽  
Vol 6 (22) ◽  
pp. 9066-9072 ◽  
Author(s):  
Jiaming Liu ◽  
Zhen-bo Liu ◽  
Qitong Huang ◽  
Xiaofeng Lin ◽  
Li-Hong Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Catalytic Effect ◽  
Solid Substrate ◽  
Acridine Yellow ◽  
H2o2 Oxidation

A new solid substrate-room temperature phosphorimetry (SS-RTP) method for colchicine (COL) detection has been established based on its strong catalytic effect on H2O2 oxidation of acridine yellow (AY), which sharply quenched the room temperature phosphorimetry (RTP) of AY.

The Preparation of Aramid Paper and its Properties

2013 ◽  
Vol 796 ◽  
pp. 290-293 ◽  
Author(s):  
Li Rong Yao ◽  
Wei Tao Zhao ◽  
Shan Qing Xu ◽  
Qi Long Sun
Keyword(s):  
Room Temperature ◽  
Solvent System ◽  
Amorphous Structure ◽  
Short Fiber ◽  
Adhesive Property ◽  
The Other ◽  
Insulation Property ◽  
Main Factors ◽  
High Shearing ◽  
Weight Loss Process

The meta-aramid fibrids were prepared by precipitation in this paper. The meta-aramid solution dissolved in the solvent system DMAc/LiCl was injected into the high shearing coagulant at room temperature and the mixture of water and N, N-dimethylacetamide(DMAc) was used as coagulant. The shearing rate, viscosity of the solution and the concentration of water in coagulant were the main factors on effecting the formation of fibrids. The meta-aramid fibrid has a gradual weight loss process when the temperature increases from 100°C to 400°C, lower thermal property of meta-aramid fibrid was due to the hydrogen bonding and crystalline structure were broken during dissolving process, however, a flexible and easy dispersing property of meta-aramid fibrid in fluid is due to its amorphous structure, which are very important that the meta-aramid fibrid has a better binding and adhesive property with the aramid short fiber in aramid paper, then yield a high mechanical and insulation property for aramid paper. Then, the properies of aramid paper were investigated. The results indicated that the proportion of meta-aramid fibrid in the aramid paper and the length of shorten aramid fiber are the main factors for affecting the strength and the other properties of aramid paper.

Formation of Cu3Si and its catalytic effect on silicon oxidation at room temperature

1991 ◽  
Vol 9 (3) ◽  
pp. 1501-1505 ◽  
Author(s):  
L. Stolt ◽  
A. Charai ◽  
F. M. D’Heurle ◽  
P. M. Fryer ◽  
J. M. E. Harper
Keyword(s):  
Room Temperature ◽  
Catalytic Effect ◽  
Silicon Oxidation
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