... , the effect of strain—which extends from the dislocations into the remaining superconducting bridges over the grain boundary—was previously unknown. NIST’s Danko van der Laan and his collaborators ...
Researchers have discovered that a reduction in mechanical strain at the boundaries of crystal grains can significantly improve the performance of high-temperature superconductors.
... per square meter per day.
Defects such as pinholes, cracks and grain boundaries are common in thin oxide barrier films when fabricated onto plastic substrates. These defects cause a ...
... a metal could be made to cool with the same internal structure as a glass and without crystal grain boundaries, it would be less likely to fail.
Metallic glasses could be suitable for a whole range ...
... components when stress or strain is combined with a corrosive environment that attacks sensitive grain boundaries. These cracks represent a critical failure mechanism. In power generation plants, ...
... the coercivity mechanism can contribute to different structure defect thickness at the grain boundary, and also found that the coercivity reaches the maximum when the structure defect thickness is 2r0 ...
... the attenuation of superconducting properties, which can be observed when electric current flows over such a grain boundary. This phenomenon is undesired if the superconductor is intended to be used ...
... the hop rates in the different elements in the alloy, there's a more pronounced diffusion along grain boundaries. This possibly leads to a faster degradation. Thornton's collaborators on this project ...
... way that they transfer light into electricity similar to a single crystal material despite having grain boundaries. These materials are also much less expensive, according to Wang.
"The problem with ...
... propagating." In crystalline materials there are many barriers to crack propagation, including grain boundaries, inclusions, and other microstructural obstacles. Says Ritchie, "The fatigue limit is ...
... the grain sizes of the copper become important and conductance is affected by scattering at the grain boundaries and at the side walls. These add up to increased resistivity, which nearly doubles as ...
... in virtually the same way. “This work represents a paradigm shift in our understanding of grain boundaries,” Douglas says. “All the important qualities relating to atomic motion in both of these ...
... film.
When the researchers examined the RTP-treated films, they found no evidence of cracks at grain boundaries. Although they found other types of defects, these don't seem to affect the membrane ...
... to two minutes and then quickly cooling it, the researchers say they have been able to eliminate the formation of grain boundary defects that undermine the sieve-like quality of zeolite's uniformly ...
... Diamond Technologies Inc., and Innovative Micro Technology, have discovered that defects at the grain boundary in ultrananocrystalline diamond (UNCD) hold primary responsibility for the fundamental ...
