crystallographic axis

crystallographic axis

[¦kris·tə·lō¦graf·ik ′ak·səs]
(crystallography)
One of three lines (sometimes four, in the case of a hexagonal crystal), passing through a common point, that are chosen to have definite relation to the symmetry properties of a crystal, and are used as a reference in describing crystal symmetry and structure.
References in periodicals archive ?
2] [PHI]) is the average value of the cosine squared of the angle ([PHI]) between the film machine direction and a crystallographic axis.
For the case of complete parallel alignment of crystallographic axis with the fiber, [[phi].
i,j] was the mean square cosine of j pseudo-orthorhombic crystallographic axis with respect to i principal stretch direction.
The degree of biaxial orientation of a specified crystallographic axis was quantified with pole figure data by calculating White and Spruiell (26) biaxial orientation factors: