Pma2 jpeg

Pma2 jpeg



International Tables for Crystallography (2006). Voł. A, Space group 28, pp. 224-225.

Pma 2    Ct


mm 2    Orthorhombic


No. 28


Pma 2


Patterson symmetry Pmmm


Pma2

1

i

—♦

1 i £ ?

i

i

1

i

1

♦—

1

I

t

n

PI cm

f

f

£ j : : i i i i

i

1

I


r


*o

*o

o*

o*

-o

*0

♦o

*o


o    o*


Origin on lo2

Asymmetric unit 0 <* < J; 0 < y < 1; 0 < z < 1 Symmetry operations

(1) 1    (2) 2 0,0,z    (3) a x,0,z    (4) m ),y,z

CONTINUED


No. 28


Pma 2


Generators selected (1); f(l,0,0); /(0,1-0); /(0,0,1); (2); (3) Positions

Multiplicity,    Coordinates

Wyckoff letter,

Site symmetry

Reflection conditions General:

4

d 1

(D*,y,z

(2) x,y,z

(3) \,y,z

(4)x+j,y,z

hOl : h = 2n A00: h = 2n

Special: as above, plus

2

c m..

19,*

no extra conditions

2

b ..2

0,i ,z

5,Z

hkl : h = 2n

2

a ..2

0,0, Z

j,0, Z

hkl : h = 2n

Along [001] plmg a = a b = b

Origin at 0,0, z

Along [100] p Im 1 a' = b b' = c Origin at x, 0,0

Along jOlO] pllm a' = c b' = |a Origin at0,y,0

Symmetry of special projections

Maximal non-isomorphic subgroups

I [2] Pio 1 (Pc, 7)    1; 3

[2j Pm 11 (Pm, 6)    1; 4

[2]PI 12(P2,3)    1; 2

Ila nonę

Ilb [2] Pba2(b' = 2b) (32); [2] Pmn2, (c = 2c) (31); [2] Pcn2 (c1 = 2c) (Pnc2,30); [2]Pca2, (c* = 2c) (29); [2) Aea2(b' = 2b,ć = 2c) (41); [2]Ama2 (b' = 2b,c' = 2c) (40)

Maximal isomorphic subgroups of lowest index

Dc [2] Pma 2 (b' = 2b) (28); [2] Pm a 2 (ć = 2c) (28); [3] Pma2 (a' = 3a) (28)

Minimal non-isomorphic supergroups

I    [2]Pccm(49); [2JPmma(51); [2]Pmna(53); [2]Pbcm(57)

II    [2] Cmm2 (35); [2] Bme2 (Aem2, 39); [2] Ama2 (40); [2] lma2 (46); [2] Pmm2 (a' = ?a)(25)

225


Wyszukiwarka

Podobne podstrony:
Pma2 jpeg International Tables for Crystallography (2006). Voł. A, Space group 28, pp. 224-225.Pma 2
Pba2 jpeg International Tables for Crystalfography (2006). Vol. A, Space group 32, pp. 232-233.Pba 2
Pca21 jpeg International Tables for Crystallography (2006). Vol. A, Space group 29, pp. 226-227,Pca
Pnc2 jpeg International Tables for Crystatbgraphy (2006), Vol. A, Space group 30, pp. 228-229.Pnc 2
Pnn2 jpeg International Tables for Crystallography (2006). Vol. A, Space group 34, pp. 236-237.Pnn 2
Pnc2 jpeg International Tables for Ciystallography (2006). Vol. A, Space group 30, pp. 228-229.Pnc2N
Pcc2 jpeg International Tables for Crysiallography (2006). Vol. A, Space group 27, pp, 222-223. Pc
Pmm2 jpeg International Tabies for Crystallography (2006). Vol. A, Space group 25, pp. 218-219.Pmm 2
Pmn21 jpeg International Tabl&s for Crystaltogmphy (2006). VoL A, Space group 31, pp.
P21c jpeg International Tables for C/ystallography (2006). Vol. A, Space group 14, pp. 184-191,P2,/c
P21m jpeg International Tables for Crystaliography (2008). Vol. A, Space group 11, pp, 164-167.P2,/m
Pc jpeg International Tablas for Crystaltagraphy (2006). VoL A, Space group 7, pp, 136-143.Pc  
Pna21 jpeg International Tables tor Crystallography (2006). Vol. A, Spaca group 33, pp. 234-235. P
Pmc21 jpeg International Tabies for Crystaflography (2008), Vol. A, Space group 26, pp. 220-221.Pmc2

więcej podobnych podstron