| 释义 |
space group Cryst.
[f. space n.1 + group n., tr. G. raumgruppe (A. Schoenflies 1891, in Krystallsyst. und Krystallstruct. II. iv. 359).]
Any of the 230 sets of symmetry operations, derived from the point groups by the inclusion of translations, glide planes, and screw axes, which are used to classify crystal structures.
1901Rep. Brit. Assoc. Adv. Sci. 1901 322 [Schoenflies] calls the groups of operations, whether those of Jordan or those added by himself, ‘space-groups’ (Raumgruppen). 1903H. Hilton Math. Crystallogr. xvii. 159 Every space⁓group is isomorphous with one of the thirty-two point⁓groups consistent with the law of rational indices. 1934W. P. Davey Study of Crystal Struct. viii. 240 The 230 space-groups are listed..giving..the Schoenflies code for the derivation of the space-group. 1974Nature 11 Jan. 85/2 Dark-field observation could establish the presence of centres of symmetry, glide planes and screw axes, which could lead to the establishment of the space group. |