Table 2. Superspace groups for incommensurate compounds with two-dimensional modulations.
Given are the published modulation wavevectors and superspace-group symbols, the number and symbol of the standard BSG setting of the superspace group in 
, and the transformation of the published basic structure unit cell to the standard BSG setting as well as the modulation wavevectors of the latter.
| Published |
|
Superspace-group symbols for | Standard BSG setting | ||||
|---|---|---|---|---|---|---|---|
| Compound | Note |
 (K) |
 /
|
No. | published/standard BSG settings |
|
 /
|
Mo S
|
(a) |
|
|
2.2.1.1 |
|
|
|
|
|
|
|||||
| (Bi,Pb)2(Sr,Bi,Pb,Ca)2- | (b) |
|
|
9.2.4.1 |
|
|
|
CuO
|
|
|
|
||||
| NbSe
|
(c) |
|
|
11.2.6.4 |
|
|
|
|
|
|
|||||
| TTF TCNQ | (d) |
|
|
14.2.16.6 |
|
|
|
|
|
|
|||||
(PO) (WO)
|
(e) |
|
|
19.2.50.3 |
|
|
|
|
|
|
|||||
Sm CrS
|
(f) |
|
|
62.2.50.22 |
 m¨g
|
|
|
|
|
|
|||||
GdS
|
(g) |
|
|
85.2.58.2 |
|
|
|
|
|
|
|||||
LaSe
|
(h) |
|
|
85.2.58.2 |
|
|
|
|
|
|
|
|||||
Ba Sr NbO
|
(i) |
|
|
100.2.69.13 |
|
|
|
|
|
|
|||||
| SrTiSiO
|
(j) |
|
|
100.2.69.14 |
|
|
|
|
|
|
|||||
CaCoSiO
|
(k) |
|
|
113.2.68.6 |
|
|
|
|
|
|
|||||
(Sr Ca )CoSiO
|
(l) |
|
|
113.2.68.6 |
|
|
|
|
|
|
|||||
| CaNdGaO
|
(m) |
|
|
113.2.68.6 |
|
|
|
|
|
|
|||||
| CaLaGaO
|
(n) |
|
|
113.2.68.6 |
|
|
|
|
|
|
|||||
Ni SnTe
|
(o) |
|
|
139.2.67.7 |
|
 ,  , 
|
|
|
|
|
|||||
 -TaS
|
(p) |
|
|
147.2.72.1 |
|
,  ,
|
|
|
|
|
|||||
 -Cu Si |
(q) |
|
|
162.2.76.3 |
|
, ,
|
|
|
|
|
|||||
 -TaSe
|
(r) |
|
|
176.2.80.1 |
|
, ,
|
|
|
|
|
|||||
Ag NbS
|
(s) |
|
|
186.2.83.4 |
|
, , 
|
|
|
|
|
|||||
Au Cd
|
(t) |
|
|
194.2.83.4 |
|
, ,
|
|
|
|
|
|||||
Cu Sb |
(u) |
|
|
194.2.83.4 |
|
, ,
|
|
|
|
|
|
|||||
Notes: (a) Schutte et al. (1993 ▶). (b) Gao et al. (1990 ▶). (c) van Smaalen et al. (1992 ▶). (d) TTF (tetrathiafulvalene) and TCNQ (tetracyanoquinodimethane), Bouveret & Megtert (1989 ▶). (e) Ludecke et al. (2001 ▶); an extensive review of basic structures and CDW transitions of the phosphate bronzes (PO)(WO)
(
) is given by Roussel et al. (2000 ▶). (f) Lafond et al. (1996 ▶). (g) Tamazyan et al. (2003 ▶). (h) Graf & Doert (2009 ▶). (i) Woike et al. (2003 ▶). (j) Höche et al. (2003 ▶). (k) Hagiya et al. (1993 ▶). (l) Bagautdinov et al. (2000 ▶). (m) Wei et al. (2011 ▶). (n) Wei et al. (2012 ▶). (o) Isaeva et al. (2007 ▶). (p) Yamamoto et al. (1990 ▶) and Spijkerman et al. (1997 ▶). (q) Palatinus et al. (2011 ▶). (r) Ludecke et al. (1999 ▶). (s) van der Lee et al. (1991 ▶). (t) Yamamoto (1983 ▶). (u) Motai et al. (1993 ▶).