Table 2.2.3.3

International
Tables for
Crystallography
Volume B
Reciprocal space
Edited by U. Shmueli

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International Tables for Crystallography (2006). Vol. B. ch. 2.2, p. 214

C. Giacovazzo^a ^*

^aDipartimento Geomineralogico, Campus Universitario, I-70125 Bari, Italy
Correspondence e-mail: c.giacovazzo@area.ba.cnr.it

Table 2.2.3.3 | top | pdf |
Allowed origin translations, seminvariant moduli and phases for centrosymmetric non-primitive space groups

	H–K group
	$[(h, l) {\underline C} (2, 2)]$	$[(k, l) {\underline I}(2, 2)]$	$[(h + k + l) {\underline F}(2)]$	$[(l) {\underline I} (2)]$	$[{\underline I}]$
Space groups	$[\displaystyle C {2\over m}]$	Immm	Fmmm	$[\displaystyle I {4\over m}]$	$[Im \bar{3}]$
	$[\displaystyle C {2\over c}]$	Ibam	Fddd	$[\displaystyle I {4_{1}\over a}]$	$[Ia \bar{3}]$
	Cmcm	Ibca	$[Fm \bar{3}]$	$[\displaystyle I {4\over m} mm]$	$[Im \bar{3} m]$
	Cmca	Imma	$[Fd \bar{3}]$	$[\displaystyle I {4\over m} cm]$	$[Ia \bar{3} d]$
	Cmmm		$[Fm \bar{3} m]$	$[\displaystyle I {4_{1}\over a} md]$
	Cccm		$[Fm \bar{3} c]$	$[\displaystyle I {4_{1}\over a} cd]$
	Cmma		$[Fd \bar{3} m]$
	Ccca		$[Fd \bar{3} c]$
Allowed origin translations	(0, 0, 0)	(0, 0, 0)	(0, 0, 0)	(0, 0, 0)	(0, 0, 0)
	$[(0, 0, {1\over 2})]$	$[(0, 0, {1\over 2})]$	$[({1\over 2}, {1\over 2}, {1\over 2})]$	$[(0, 0, {1\over 2})]$
	$[({1\over 2}, 0, 0)]$	$[(0, {1\over 2}, 0)]$
	$[({1\over 2}, 0, {1\over 2})]$	$[({1\over 2}, 0, 0)]$
Vector $[{\bf h}_{s}]$ seminvariantly associated with $[{\bf h} = (h, k, l)]$				(l)
Seminvariant modulus $[\boldomega _{s}]$	(2, 2)	(2, 2)	(2)	(2)	(1, 1, 1)
Seminvariant phases	$[\varphi_{eee}]$	$[\varphi_{eee}]$	$[\varphi_{eee}]$	$[\varphi_{eoe}]$ ; $[\varphi_{eee}]$ $[\varphi_{ooe}]$ ; $[\varphi_{oee}]$	All
Number of semindependent phases to be specified	2	2	1	1	0