Floating zone partial melting and solidification of SmBCO superconductor under low oxygen partial pressure

1998 ◽  
Vol 13 (10) ◽  
pp. 2807-2818 ◽  
Author(s):  
M. Sumida ◽  
S. Matsuoka ◽  
Y. Shiohara ◽  
T. Umeda
Keyword(s):  
Growth Rate ◽  
Critical Current Density ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Partial Melting ◽  
Floating Zone ◽  
Low Oxygen ◽  
Initial Composition ◽  
Oxygen Annealing ◽  
Melting And Solidification

Microstructure control of SmBCO superconductor was carried out using the floating zone partial melting and solidification method under 0.01 atm oxygen partial pressure which is a preferable atmosphere to obtain a crystal with stoichiometric SmBCO. The growth rate, initial composition, and addition of small amount of platinum dependences on the microstructure formations of the (Sm211 + L) mixture during melting and the Sm123 or Sm123/211 during solidification were investigated. Furthermore, superconductive properties of the solidified Sm123/211 were measured by SQUID after appropriate oxygen annealing. Estimated critical current density of the single crystalline Sm123/211 was 3.6 × 104 A/cm at 77 K, 1 T.

scholarly journals Fabrication of Titanium Single Crystal by a Floating Zone Method under Extremely Low Oxygen Partial Pressure

2008 ◽  
Vol 72 (12) ◽  
pp. 928-934 ◽  
Author(s):  
Koji Hagihara ◽  
Takahiro Tachibana ◽  
Keita Sasaki ◽  
Yoshiyuki Yoshida ◽  
Naoki Shirakawa ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Single Crystal ◽  
Floating Zone ◽  
Low Oxygen ◽  
Zone Method ◽  
Floating Zone Method

Enhancement of autotrophic growth rate ofAlcaligenes eutrophus in a medium containing perfluorocarbon under low oxygen partial pressure

1992 ◽  
Vol 14 (8) ◽  
pp. 733-736 ◽  
Author(s):  
Shinjiro Yamamoto ◽  
Hiroyuki Honda ◽  
Naohiro Shiragami ◽  
Hajime Unno
Keyword(s):  
Growth Rate ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Autotrophic Growth ◽  
Low Oxygen

scholarly journals Oxygen Distribution in Titanium Single Crystal Fabricated by Optical Floating-Zone Method under Extremely Low Oxygen Partial Pressure

2009 ◽  
Vol 50 (12) ◽  
pp. 2709-2715 ◽  
Author(s):  
Koji Hagihara ◽  
Takahiro Tachibana ◽  
Keita Sasaki ◽  
Yoshiyuki Yoshida ◽  
Naoki Shirakawa ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Single Crystal ◽  
Oxygen Distribution ◽  
Floating Zone ◽  
Low Oxygen ◽  
Zone Method ◽  
Floating Zone Method

Textured YBaCuO Films Enhanced by Cold Rolling and Melt Growth Process in Low Oxygen Partial Pressure

2005 ◽  
Vol 105 ◽  
pp. 453-458 ◽  
Author(s):  
J. Wang ◽  
N. Maloufi ◽  
Xiang Xin Xue ◽  
Z.G. Fan ◽  
Claude Esling
Keyword(s):  
Critical Current Density ◽  
Cold Rolling ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Critical Current ◽  
Current Density ◽  
Control Sample ◽  
Secondary Phase ◽  
Low Oxygen ◽  
Texture Orientation

High critical current density Jc under high magnetic field is required in numerous applications for high temperature superconductor YBa2Cu3O7-δ (Y123). Significant efforts have been made to control sample preparation in view of optimized textures and microstructures. In YBa2Cu3O7-δ superconductor, Jc is limited by grain misalignment and by other defaults like secondary phase (Y211), microcracks... So YBaCuO films were prepared by electrophoretic deposition directly on polycrystalline Ag substrate. Melt textured growth (MTG) in low oxygen partial pressure and cold rolling were performed to YBaCuO samples respectively to improve texture growth of the films and to study deformation effect on the texture. The film obtained by melted growth after rolling has better texture orientation than the film without rolling, and presents higher critical current density.

Quantitative evaluation of the oxidation behavior of ZrB2-15 vol.%SiC at a low oxygen partial pressure

Vacuum ◽  
2013 ◽  
Vol 88 ◽  
pp. 98-102 ◽  
Author(s):  
Ai Momozawa ◽  
Rong Tu ◽  
Takashi Goto ◽  
Yuuki Kubota ◽  
Hiroshi Hatta ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Quantitative Evaluation ◽  
Oxidation Behavior ◽  
Low Oxygen

Enhanced superconductivity in Nd1+xBa2-xCu3O7+δby low oxygen partial pressure annealing

1994 ◽  
Vol 23 (11) ◽  
pp. 1117-1120 ◽  
Author(s):  
M. J. Kramer ◽  
A. Karion ◽  
K. W. Dennis ◽  
M. Park ◽  
R. W. McCallum
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Low Oxygen ◽  
Enhanced Superconductivity

Controlled partial melting during isobaric and isothermal processing of dipcoated Bi-2212/Ag tapes

1998 ◽  
Vol 13 (12) ◽  
pp. 3580-3586 ◽  
Author(s):  
A. L. Crossley ◽  
J. L. MacManus-Driscoll
Keyword(s):  
Phase Diagram ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Partial Melting ◽  
Coulometric Titration ◽  
Processing Route ◽  
Optimum Processing ◽  
Partial Pressures ◽  
Titration Technique

A detailed study has been made of the control and optimization of partial melting of dipcoated Bi2Sr2Ca1Cu2O8+δAg0.1 (Bi-2212) tapes using reduced oxygen partial pressures. A coulometric titration technique has been employed to vary the oxygen partial pressure in a region of the phase diagram corresponding to binary melting, and the amount of partial melting has been quantified. Using this information, tapes have been processed using both isothermal and isobaric techniques. An optimum processing route was determined which combined isothermal and isobaric processes. Highly aligned material at the point of optimum melting was obtained.

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