symmetry element


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symmetry element

[′sim·ə‚trē ‚el·ə·mənt]
(crystallography)
Some combination of rotations and reflections and translations which brings a crystal into a position that cannot be distinguished from its original position. Also known as symmetry operation; symmetry transformation.
The rotational axes, mirror planes, and center of symmetry characteristic of a given crystal.
References in periodicals archive ?
However, the acoustopolarigrams of samples h001, h003, h007, h009, h010, h023 and h025 show the presence of the symmetry element projections on all three faces and with a more rigorous approach they should be assigned near to the orthorhombic (R in Table) symmetry type (Gorbatsevich, 2009).
The acoustopolariscopy method allows one to determine spatial orientation of the symmetry element projections, to distinguish the quasi-transverse-isotropic elastic symmetry type from the orthorhombic type.
This method solves the problem of experimental determination of spatial orientation, the type and number of symmetry elements in anisotropic heterogeneous media.
Sharp minimums of the amplitudes on the VC acoustopolarigrams allow one to determine the directions of elastic symmetry elements (axes and planes).
One can draw straight lines connecting the minimal amplitude of the signal passing through the sample almost everywhere on the VC acoustopolarigrams and thus determine the spatial location of the projections of elastic symmetry elements.
The presence of the symmetry elements on the acoustopolarigrams of samples 24996s, 28184s point to near orthorhombic symmetry type, while those of samples 30020, 24947--to transversal-isotropic.
Earlier a similar effect of depolarization of linearly polarized light waves as they propagate through accidentally heterogeneous media or media composed of anisotropic materials (layers) with differently oriented symmetry elements, was registered in optics (Shurkliff, 1962).
9] symmetry element failure the number of achievable nulls are eight, while due to the [w.
The collection of symmetry elements that describes the symmetry of a crystalline material is summarized by the crystallographic space group.
sd]) (a) The space group describes all the symmetry elements of a crystal lattice.
structure having symmetry elements incompatible with translational periodicity was shown.
Symmetry elements lost in each step of the sequence determine the possibilities for variants of the low symmetry phase and domains with characteristic interfaces that can be present in the microstructure.

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