screw dislocation sentence in Hindi
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- In the case of a screw dislocation, the scattering vector has to have a component along the Burgers vector, which is now parallel to dislocation line.
- The fundamental thermodynamic effect of a screw dislocation is to eliminate this discontinuity in the chemical potential, by making it impossible to ever complete a single crystal face.
- Edge dislocations have the direction of the burgers vector perpendicular to the dislocation line, while screw dislocations have the direction of the burgers vector parallel to the dislocation line.
- The screw dislocation is more difficult to visualise, but basically comprises a structure in which a helical path is traced around the linear defect ( dislocation line ) by the atomic planes of atoms in the crystal lattice.
- For example, in materials with a body-centered cubic ( bcc ) lattice the DBTT is readily apparent, as the motion of screw dislocations is very temperature sensitive because the rearrangement of the dislocation core prior to slip requires thermal activation.
- Pure germanium spontaneously extrudes very long screw dislocations, and this is one of the primary reasons for the failure of older diodes and transistors made from germanium; depending on what they eventually touch, they may lead to an electrical short.
- In the second case, the most significant factor, which is determined by the temperature, is the mobility of the structural defects such as grain boundaries, point vacancies, line and screw dislocations, stacking faults and twins in both crystalline and non-crystalline solids.
- Moreover, these elongated crystals contained a spiral defect running through them; this screw dislocation, as geologists call the flaw, is known to be produced when the crystals form at extremely high temperatures usually associated with hot gases from volcanic vents, or fumeroles.
- Micropipes are considered to be empty-core screw dislocations with large strain energy ( i . e . they have large Burgers vector ); they follow the growth direction ( c-axis ) in silicon carbide boules and substrates propagating into the deposited epitaxial layers.
- Examples of topological solitons include the screw dislocation in a crystalline lattice, the Dirac string and the magnetic monopole in electromagnetism, the Skyrmion and the Wess Zumino Witten model in quantum field theory, the magnetic skyrmion in condensed matter physics, and cosmic strings and cosmology.
- The explanation was motivated by the absence of axial screw dislocations in the whiskers ( which in themselves are a growth mechanism ), the requirement of the gold droplet for growth, and the presence of the droplet at the tip of the whisker during the entire growth process.
- Where surface relief can be resolved to the level of an atomic step, screw dislocations appear as distinctive spiral features thus revealing an important mechanism of crystal growth : where there is a surface step, atoms can more easily add to the crystal, and the surface step associated with a screw dislocation is never destroyed no matter how many atoms are added to it.
- Where surface relief can be resolved to the level of an atomic step, screw dislocations appear as distinctive spiral features thus revealing an important mechanism of crystal growth : where there is a surface step, atoms can more easily add to the crystal, and the surface step associated with a screw dislocation is never destroyed no matter how many atoms are added to it.
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