Observations of grain boundary chemistry variations in a boron carbide processed with oxide additives

2018 ◽  
Vol 142 ◽  
pp. 106-110 ◽  
Author(s):  
Kristopher D. Behler ◽  
Christopher J. Marvel ◽  
Jerry C. LaSalvia ◽  
Scott D. Walck ◽  
Martin P. Harmer
Keyword(s):  
Grain Boundary ◽  
Boron Carbide ◽  
Boundary Chemistry

Effect of thermal annealing on grain boundary chemistry of polycrystalline TiBa2Ca2Cu3Oy films

1994 ◽  
Vol 52 ◽  
pp. 968-969
Author(s):  
Z. L. Wang ◽  
C. L. Briant ◽  
J. DeLuca ◽  
A. Goyal ◽  
D. M. Kroeger ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Weak Link ◽  
Zero Field ◽  
Stabilized Zirconia ◽  
Local Texture ◽  
Transmission Electron ◽  
Axis Alignment ◽  
Boundary Chemistry ◽  
Small Misorientation ◽  
Misorientation Angles

Recent studies have shown that spray-pyrolyzed films of the Tl-1223 compound (TlxBa2Ca2Cu3Oy, with 0.7 < × < 0.95) on polycrystalline yttrium stabilized zirconia substrates can be prepared which have critical current density Jc near 105 A/cm2 at 77 K, in zero field. The films are polycrystalline, have excellent c-axis alignment, and show little evidence of weak-link behavior. Transmission electron microscopy (TEM) studies have shown that most grain boundaries have small misorientation angles. It has been found that the films have a nigh degree of local texture indicative of colonies of similarly oriented grains. It is believed that inter-colony conduction is enhanced by a percolative network of small angle boundaries at colony interfaces. It has also been found that Jc is increased by a factor of 4 - 5 after the films were annealed at 600 °C in oxygen. This study is thus carried out to determine the effect on grain boundary chemistry of the heat treatment.

scholarly journals Tailoring the Grain Boundary Chemistry of Polymeric Carbon Nitride for Enhanced Solar Hydrogen Production and CO2 Reduction

2019 ◽  
Vol 131 (11) ◽  
pp. 3471-3475 ◽  
Author(s):  
Guigang Zhang ◽  
Guosheng Li ◽  
Tobias Heil ◽  
Spiros Zafeiratos ◽  
Feili Lai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Grain Boundary ◽  
Carbon Nitride ◽  
Co2 Reduction ◽  
Solar Hydrogen ◽  
Solar Hydrogen Production ◽  
Boundary Chemistry ◽  
Polymeric Carbon

scholarly journals Criterion for High Temperature Failure and Grain Boundary Chemistry in Superplastic TZP

2004 ◽  
Vol 45 (7) ◽  
pp. 2106-2111 ◽  
Author(s):  
Hidehiro Yoshida ◽  
Hitoshi Nagayama ◽  
Akihide Kuwabara ◽  
Taketo Sakuma
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Boundary Chemistry

scholarly journals Criterion for High Temperature Failure and Grain Boundary Chemistry in Superplastic TZP

2005 ◽  
Vol 69 (9) ◽  
pp. 835-840
Author(s):  
Hidehiro Yoshida ◽  
Hitoshi Nagayama ◽  
Akihide Kuwabara ◽  
Taketo Sakuma
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Boundary Chemistry
Sign in / Sign up

Export Citation Format

Share Document