ChemInform Abstract: Microstructure and Superconducting Properties of High-Density Consolidated YBa2Cu3Ox.

ChemInform ◽  
1989 ◽  
Vol 20 (9) ◽  
Author(s):  
R. N. SHELTON ◽  
D. ANDREASEN ◽  
P. KLAVINS ◽  
H. W. CHAN ◽  
B. L. OSLIN ◽  
...  
Keyword(s):  
High Density ◽  
Superconducting Properties

A Hydroxycarbonate Route to Superconductor Precursor Powders

1987 ◽  
Vol 99 ◽  
Author(s):  
J. A. Voigt ◽  
B. C. Bunker ◽  
D. H. Doughty ◽  
D. L. Lamppa ◽  
K. M. Kimball
Keyword(s):  
Critical Temperature ◽  
Structural Integrity ◽  
Nitrate Solution ◽  
High Density ◽  
Tetramethylammonium Hydroxide ◽  
Precipitation Process ◽  
High Critical Temperature ◽  
Superconducting Properties ◽  
Superconducting Ceramics ◽  
Precursor Powders

ABSTRACTA precipitation process is described for the preparation of powders that can be thermally decomposed to form high critical temperature superconductors such as YBa2Cu3O7. In the process, a cationic solution (a concentrated chloride or nitrate solution) is instantaneously mixed with an anionie solution (a mixture of tetramethylammonium hydroxide and carbonate) to produce a metal-hydroxycarbonate precipitate having the metal stoichiometry of the desired superconducting oxide. The calcining and sintering of the precipitates is critical in controlling the structural integrity and morphology of the superconducting ceramics made from the chem-prep powders, as well as controlling superconducting properties. Under appropriate conditions, high density (>95%) materials that exhibit good superconducting characteristics can be prepared with the chem-prep powders.

Grain size effects on the superconducting properties of high density bulk MgB2

2004 ◽  
Vol 17 (9) ◽  
pp. S583-S588 ◽  
Author(s):  
Giovanni Giunchi ◽  
Giovanni Ripamonti ◽  
Simone Raineri ◽  
Danilo Botta ◽  
Roberto Gerbaldo ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Effects ◽  
High Density ◽  
Superconducting Properties ◽  
Bulk Mgb2 ◽  
Grain Size Effects

Superconducting Properties in SmBa2Cu3Oy Films With High Density of BaHfO3 Nanorods Fabricated With a Seed Layer

2015 ◽  
Vol 25 (3) ◽  
pp. 1-4 ◽  
Author(s):  
S. Miura ◽  
Y. Yoshida ◽  
Y. Ichino ◽  
A. Tsuruta ◽  
K. Matsumoto ◽  
...  
Keyword(s):  
Seed Layer ◽  
High Density ◽  
Superconducting Properties

Oxygenation characteristics in high-density YBa2Cu3Ox ceramics

1991 ◽  
Vol 6 (7) ◽  
pp. 1398-1403 ◽  
Author(s):  
M. Kuwabara ◽  
H. Shimooka ◽  
I. Katayama ◽  
T. Inada
Keyword(s):  
Oxygen Content ◽  
Hot Pressing ◽  
Sintered Density ◽  
High Density ◽  
Superconducting Properties ◽  
Oxygen Annealing ◽  
A Value

Oxygenation characteristics in high-density YBa2Cu3Ox ceramics with a relative sintered density ≥97%, which were produced by hot-pressing to have various oxygen contents as-hot-pressed, have been investigated. The results indicate that the oxygenation characteristic in the materials was strongly affected by their oxygen content before oxygenation; that is, the attainable oxygen content (directly connected with the superconducting temperature Tc) of the materials after oxygenation increases with a decrease in their oxygen content before oxygenation. Oxygen annealing at 500 °C for 24 h dramatically increased the oxygen content of an YBa2Cu3Ox with x = 6.08 before the oxygen annealing up to 6.90, while the oxygen content of an YBa2Cu3Ox ceramic with x = 6.32 before oxygenation rose only to a value of 6.61 after the same oxygen annealing. This newly observed phenomenon on the oxygenation characteristic in the present materials may provide an idea for improving the superconducting properties in high-density YBa2Cu3Ox ceramics.

Microstructure and Superconducting Properties of High-Density Consolidated YBa2Cu3Ox

1988 ◽  
Vol 71 (12) ◽  
pp. C-487-C-489 ◽  
Author(s):  
R.N. Shelton ◽  
D. Andreasen ◽  
P. Klavins ◽  
H.W. Chan ◽  
B.L. Oslin ◽  
...  
Keyword(s):  
High Density ◽  
Superconducting Properties

Synthesis and superconducting properties of bscco including precipitates with high density

1993 ◽  
Vol 42 (1-2) ◽  
pp. 47-51 ◽  
Author(s):  
T. Umemura ◽  
K. Egawa ◽  
S. Kinouchi ◽  
S. Utsunomiya ◽  
M. Nojiri
Keyword(s):  
High Density ◽  
Superconducting Properties

The effect of pulse high-density plasma on superconducting properties of Bi-2223 multilayered tape

2010 ◽  
Vol 1 (2) ◽  
pp. 92-94 ◽  
Author(s):  
B. P. Mikhailov ◽  
L. I. Ivanov ◽  
V. F. Shamrai ◽  
V. Ya. Nikulin ◽  
G. N. Mikhailova ◽  
...  
Keyword(s):  
High Density ◽  
Superconducting Properties ◽  
Density Plasma

Planar defects in ordered (Ga,In)P

1988 ◽  
Vol 46 ◽  
pp. 902-903
Author(s):  
S. McKernan ◽  
C. B. Carter ◽  
D. Bour ◽  
J. R. Shealy
Keyword(s):  
Electron Diffraction ◽  
Vapor Phase ◽  
Growth Direction ◽  
High Density ◽  
Ordered Structure ◽  
Planar Defects ◽  
Diffraction Patterns ◽  
Ternary Semiconductors ◽  
Anion Species ◽  
Metallic Vapor

The growth of ternary III-V semiconductors by organo-metallic vapor phase epitaxy (OMVPE) is widely practiced. It has been generally assumed that the resulting structure is the same as that of the corresponding binary semiconductors, but with the two different cation or anion species randomly distributed on their appropriate sublattice sites. Recently several different ternary semiconductors including AlxGa1-xAs, Gaxln-1-xAs and Gaxln1-xP1-6 have been observed in ordered states. A common feature of these ordered compounds is that they contain a relatively high density of defects. This is evident in electron diffraction patterns from these materials where streaks, which are typically parallel to the growth direction, are associated with the extra reflections arising from the ordering. However, where the (Ga,ln)P epilayer is reasonably well ordered the streaking is extremely faint, and the intensity of the ordered spot at 1/2(111) is much greater than that at 1/2(111). In these cases it is possible to image relatively clearly many of the defects found in the ordered structure.

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