• "jumps" from one atom to the other with the Rayleigh Scattering ; the Velocity Of Light thus varies according to the directions, whether the atoms are close or far; this gives the Birefringence


• Adsorption and Reactivity : the adsorption and the chemical reactions occur on atoms or molecules, these phenomena are thus sensitive to the density of nodes;


• Surface Tension : the condensation of a material means that the atoms, ions or molecules are more stable if they are surrounded by other similar species; the surface tension of an interface thus varies according to the density on the surface


• --- the Pore s and Crystallite s tend to have straight grain boundaries following dense planes


• --- Cleavage


• Dislocation s ( Plastic Deformation )


• --- the dislocation core tends to spread on dense planes (the elastic perturbation is "diluted"); this reduces the Friction ( Peierls-Nabarro Force ), the sliding occurs more frequently on dense planes;


• --- the perturbation carried by the dislocation ( Burgers Vector ) is along a dense direction: the shift of one node in a dense direction is a lesser distortion;


• --- the dislocation line tends to follow a dense direction, the dislocation line is often a straight line, a dislocation loop is often a Polygon .

For all these reasons, it is important to determine the planes and thus to have a notation system.

• Coordinates in ''angle brackets'' or ''chevrons'' such as <100> denote a ''family'' of directions which are equivalent due to symmetry operations. If it refers to a cubic system, this example could mean [010 , [001] or the negative of any of those directions.


• Coordinates in ''curly brackets'' or ''braces'' such as {100} denote a family of plane normals which are equivalent due to symmetry operations, much the way angle brackets denote a family of directions.

• Crystal Structure


• Crystal

• http://www.ece.byu.edu/cleanroom/EW_orientation.phtml - Miller index description with diagrams

Articles about Miller Index