space groupn.

Brit.

/ˈspeɪs ɡruːp/, U.S.

/ˈspeɪs ˌɡrup/

Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: space n.¹, group n.

Etymology: < space n.¹ + group n., after German Raumgruppe ( A. Schoenflies Krystallsysteme u. Krystallstruct. (1891) II. iv. 359).

Crystallography and Mineralogy.

Any of the 230 sets of symmetry operations which are used to classify crystal structures, derived from the 32 point groups by the inclusion of translations, glide planes, and screw axes.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > crystal symmetry > [noun] > symmetry operations

space group1901

1901 Rep. Brit. Assoc. Advancem. Sci. 1901 322 [Schoenflies] calls the groups of operations, whether those of Jordan or those added by himself, ‘space-groups’ (Raumgruppen).

1937 W. L. Bragg Atomic Struct. Minerals i. 13 It is the possibility of screw axes and glide planes, in addition to rotation axes and reflection planes, which gives rise to the large number of space-groups.

1962 Amer. Mineralogist 47 1218 Amakinite is rhombohedral, space group D⁵3d, D⁷3 or C⁵3v.

2001 R. W. Cahn Coming of Materials Sci. iii. 67 It had been Niggli (1917) who was the first to work out the systematics that would allow a space group to be identified from systematic absences in X-ray diffractograms.

This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022).

单词	space group
释义	space groupn. Brit. /ˈspeɪs ɡruːp/, U.S. /ˈspeɪs ˌɡrup/ Origin: Formed within English, by compounding; modelled on a German lexical item. Etymons: space n.¹, group n. Etymology: < space n.¹ + group n., after German Raumgruppe ( A. Schoenflies Krystallsysteme u. Krystallstruct. (1891) II. iv. 359). Crystallography and Mineralogy. Any of the 230 sets of symmetry operations which are used to classify crystal structures, derived from the 32 point groups by the inclusion of translations, glide planes, and screw axes. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal symmetry > [noun] > symmetry operations space group1901 1901 Rep. Brit. Assoc. Advancem. Sci. 1901 322 [Schoenflies] calls the groups of operations, whether those of Jordan or those added by himself, ‘space-groups’ (Raumgruppen). 1937 W. L. Bragg Atomic Struct. Minerals i. 13 It is the possibility of screw axes and glide planes, in addition to rotation axes and reflection planes, which gives rise to the large number of space-groups. 1962 Amer. Mineralogist 47 1218 Amakinite is rhombohedral, space group D⁵3d, D⁷3 or C⁵3v. 2001 R. W. Cahn Coming of Materials Sci. iii. 67 It had been Niggli (1917) who was the first to work out the systematics that would allow a space group to be identified from systematic absences in X-ray diffractograms. This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022). < n.1901
随便看	on no kins ways on no kins ways wise on no way on non-speaks on none kin wise on none-kins wise on nonekins wise on nonspeaks on northen on notice on o' the hoigh on oath on occasion on occasion of on occasion of a person on of one's keeping on offer on oftsithes on old toes on one hand on one part, on the other part on one side on one sithe on one'its own terms on one's account