Difference between revisions of "Weiss parameters"
From Online Dictionary of Crystallography
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Revision as of 03:45, 25 February 2015
Paramètres de Weiss (Fr). Weiss-Parameter (Ge). Parámetros de Weiss (Sp). Параметры Вайс (Ru). Parametri di Weiss (It). ワイスパラメーター (Ja)
The Weiss parameters, introduced by Christian Samuel Weiss in 1818, are the ancestors of the Miller indices. They give an approximate indication of a face orientation with respect to the crystallographic axes, and were used as a symbol for the face.
Weiss parameters are the reciprocal of Miller indices, each followed by the corresponding axis symbols.
Example. Weiss parameters 2a:3b:1c indicate that a face intercepts the a axis at twice the ao units and the b axis at three times bo units as it cuts the c axis in co units. The first plane of the family to which this face belongs has intercepts at 1/3, 1/2 and 1/6 on a, b, and c respectively, so that the corresponding Miller indices are (326).