Burgers vector


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Burgers vector

[′bər·gərz ‚vek·tər]
(crystallography)
A translation vector of a crystal lattice representing the displacement of the material to create a dislocation.
References in periodicals archive ?
The edge dislocations are along the z-axis with Burgers vector bx for the edge dislocation proper represented in Fig.
The TD terminates in O, is oriented by the unit vector [xi]//O[x'.sub.3], and has the Burgers vector b.
The terms r and [theta] define the cylindrical coordinate system with the positive edge dislocation at the origin, and G is shear modulus, [??] is Poisson's ratio, and b is Burgers vector. Using the number of solvent lattice atoms per unit lattice volume, [N.sub.L], the number of hydrogen atoms per solvent atom can be calculated as [33]
In order to gain a clear idea of the most important factor which influences the dislocation preferential formation site of mixed dislocation at the plane perpendicular to the QD growth direction in InAs quantum dots, we decompose the 60[degrees] mixed dislocation into two edge dislocation components with Burgers vector [110] and [00 - 1], respectively, and a screw dislocation component with Burgers vector [-110].
The shear vectors, or Burgers vectors, were chosen from the shortest lattice vectors in order to minimize the elastic energy of the dislocation associated with the slip system, which is proportional to the square of the Burgers vector, the so-called Frank criteria.
Equal numbers of dislocations with positive and negative Burgers vectors are present in each sub-area: the net Burgers vector equals zero.
A Somigliana loop is a line defect that bounds an area within which slip has occurred with a variable slip vector from place to place, both in direction and magnitude; consequently its "Burgers vector" varies along its line.
The z-axis is the direction of the screw dislocation and the direction of the Burgers vector. In an isotropic crystal and elastic continuum theory, the screw dislocation in bulk material produces a stress field [[sigma].sub.yz] along its Burgers vector [1]
A dislocation is characterized by its dislocation-displacement vector, known as the Burgers vector, [b.sup.[mu]] in a four-dimensional continuum, defined positive in the direction of a vector [[xi].sup.[mu]] tangent to the dislocation line in the spacetime continuum [14, see pp.17-24].
A dislocation is characterized by its dislocation vector, known as the Burgers vector, [b.sup.[mu]] in a four-dimensional continuum, defined positive in the direction of a vector [[xi].sup.[mu]] tangent to the dislocation line in the spacetime continuum [6, pp.
Investigations performed on monocrystals have proved that recovery takes places by means of annihilation of dislocations with opposite Burgers vectors, tightening of dislocations loops, ordering of dislocation configurations, as well as by means of formation of subboundaries and their motions [3].