scholarly journals THE SUPERCONDUCTING PROPERTIES OF PbMo6S8 TAPES PREPARED BY REACTION DIFFUSION METHOD

1984 ◽  
Vol 33 (7) ◽  
pp. 1062
Author(s):  
LI HONG-CHENG ◽  
D. G. HINKS
Keyword(s):  
Reaction Diffusion ◽  
Diffusion Method ◽  
Superconducting Properties

scholarly journals Obtaining new composite biomaterials by means of mineralization of methacrylate hydrogels using the reaction–diffusion method

2014 ◽  
Vol 42 ◽  
pp. 696-704 ◽  
Author(s):  
Yousof Ramadan ◽  
M. Isabel González-Sánchez ◽  
Karl Hawkins ◽  
Jorge Rubio-Retama ◽  
Edelmira Valero ◽  
...  
Keyword(s):  
Reaction Diffusion ◽  
Diffusion Method ◽  
Composite Biomaterials

MgB2 superconductor prepared by Mg diffusion method with the addition of reduced graphene oxide

2018 ◽  
Vol 32 (24) ◽  
pp. 1850268
Author(s):  
Lei Li ◽  
Hong Zhang ◽  
Yong Zhao ◽  
Yong Zhang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Diffusion Method ◽  
Mgb2 Superconductor ◽  
Superconducting Properties ◽  
Reduced Graphene

The effects of 0–5 wt.% reduced graphene oxide (rGO) addition on the superconducting properties of MgB2 bulks were investigated. We found that the dense and uniform MgB2 bulks were obtained by Mg diffusion method with rGO addition. The superconducting properties of MgB2 improved by the addition of rGO content of less than 2 wt.%. With more than 2 wt.% (including 2 wt.%) of rGO addition, nonsuperconducting phase MgB2C2 appeared and MgO content increased, which resulted in a decline in superconducting properties.

scholarly journals Superconducting properties and structures of MgB2 wires prepared by external diffusion method

2014 ◽  
Vol 26 (3+4) ◽  
pp. 32-35
Author(s):  
Masataka SON ◽  
Naoya KANEDA ◽  
Masaya KANAZAWA ◽  
Yutaka YAMADA ◽  
Kyoji TACHIKAWA
Keyword(s):  
Diffusion Method ◽  
Superconducting Properties ◽  
Mgb2 Wires ◽  
External Diffusion

Characterization of Y-Ba-Cu-O films grown on silicon substrates by sequential evaporation

1988 ◽  
Vol 46 ◽  
pp. 866-867
Author(s):  
E. L. Hall ◽  
A. Mogro-Campero ◽  
L. G. Turner ◽  
N. Lewis
Keyword(s):  
Thin Film ◽  
Thin Film Deposition ◽  
Superconducting Films ◽  
Electron Beam Evaporation ◽  
Film Deposition ◽  
Silicon Substrates ◽  
Superconducting Properties ◽  
Sequential Electron ◽  
Thin Superconducting Films

There is great interest in the growth of thin superconducting films of YBa2Cu3Ox on silicon, since this is a necessary first step in the use of this superconductor in a variety of possible electronic applications including interconnects and hybrid semiconductor/superconductor devices. However, initial experiments in this area showed that drastic interdiffusion of Si into the superconductor occurred during annealing if the Y-Ba-Cu-O was deposited direcdy on Si or SiO2, and this interdiffusion destroyed the superconducting properties. This paper describes the results of the use of a zirconia buffer layer as a diffusion barrier in the growth of thin YBa2Cu3Ox films on Si. A more complete description of the growth and characterization of these films will be published elsewhere.Thin film deposition was carried out by sequential electron beam evaporation in vacuum onto clean or oxidized single crystal Si wafers. The first layer evaporated was 0.4 μm of zirconia.

Surface reactions observed by photoemission electron microscopy (PEEM)

1992 ◽  
Vol 50 (1) ◽  
pp. 286-287
Author(s):  
H.H. Rotermund
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Work Function ◽  
Chemical Reactions ◽  
Reaction Diffusion ◽  
Dynamic Processes ◽  
Clean Surface ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Photoemission Electron

Chemical reactions at a surface will in most cases show a measurable influence on the work function of the clean surface. This change of the work function δφ can be used to image the local distributions of the investigated reaction,.if one of the reacting partners is adsorbed at the surface in form of islands of sufficient size (Δ>0.2μm). These can than be visualized via a photoemission electron microscope (PEEM). Changes of φ as low as 2 meV give already a change in the total intensity of a PEEM picture. To achieve reasonable contrast for an image several 10 meV of δφ are needed. Dynamic processes as surface diffusion of CO or O on single crystal surfaces as well as reaction / diffusion fronts have been observed in real time and space.

Processing and characterization of YBa2Cu3O7−x/Ag composites

1990 ◽  
Vol 48 (4) ◽  
pp. 46-47
Author(s):  
Jafar Javadpour ◽  
Bradley L. Thiel ◽  
Sarikaya Mehmet ◽  
Ilhan A. Aksay
Keyword(s):  
Composite System ◽  
Precursor Solution ◽  
Microstructural Development ◽  
Superconducting Properties ◽  
Practical Applications ◽  
Nitrate Precursor ◽  
Cold Pressed ◽  
Tape Cast ◽  
Composite Samples

Practical applications of bulk YBa2Cu3O7−x materials have been limited because of their inadequate critical current density (jc) and poor mechanical properties. Several recent reports have indicated that the addition of Ag to the YBa2Cu3O7−x system is beneficial in improving both mechanical and superconducting properties. However, detailed studies concerning the effect of Ag on the microstructural development of the cermet system have been lacking. Here, we present some observations on the microstructural evolution in the YBa2Cu3O7−x/Ag composite system.The composite samples were prepared by mixing various amounts (2.5 - 50 wt%) AgNO3 in the YBa2Cu3O7−x nitrate precursor solution. These solutions were then spray dried and the resulting powders were either cold pressed or tape cast. The microstructures of the sintered samples were analyzed using SEM (Philips 515) and an analytical TEM (Philips 430T).The SEM micrographs of the compacts with 2.5 and 50 wt% Ag addition sintered at 915°C (below the melting point of Ag) for 1 h in air are displayed in Figs. 1 and 2, respectively.

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