MAGNDATA - Collection of Magnetic Structures

Symmetry operations of the magnetic space group in the setting used:

N	(x,y,z)	Seitz notation
1	x,y,z,+1	{ 1 \| 0 }
2	-y+1/3,x-y+1/3,z,+1	{ 3⁺₀₀₁ \| 1/3 1/3 0 }
3	-x+y,-x+1/3,z,+1	{ 3^-₀₀₁ \| 0 1/3 0 }
4	-x+y,y,z+1/2,+1	{ m₁₀₀ \| 0 0 1/2 }
5	-y+1/3,-x+1/3,z+1/2,+1	{ m₁₁₀ \| 1/3 1/3 1/2 }
6	x,x-y+1/3,z+1/2,+1	{ m₀₁₀ \| 0 1/3 1/2 }
(1/3,2/3,0) + set click here to show and hide
7	x+1/3,y+2/3,z,+1	{ 1 \| 1/3 2/3 0 }
8	-y+2/3,x-y,z,+1	{ 3⁺₀₀₁ \| 2/3 0 0 }
9	-x+y+1/3,-x,z,+1	{ 3^-₀₀₁ \| 1/3 0 0 }
10	-x+y+1/3,y+2/3,z+1/2,+1	{ m₁₀₀ \| 1/3 2/3 1/2 }
11	-y+2/3,-x,z+1/2,+1	{ m₁₁₀ \| 2/3 0 1/2 }
12	x+1/3,x-y,z+1/2,+1	{ m₀₁₀ \| 1/3 0 1/2 }
(2/3,1/3,0) + set click here to show and hide
13	x+2/3,y+1/3,z,+1	{ 1 \| 2/3 1/3 0 }
14	-y,x-y+2/3,z,+1	{ 3⁺₀₀₁ \| 0 2/3 0 }
15	-x+y+2/3,-x+2/3,z,+1	{ 3^-₀₀₁ \| 2/3 2/3 0 }
16	-x+y+2/3,y+1/3,z+1/2,+1	{ m₁₀₀ \| 2/3 1/3 1/2 }
17	-y,-x+2/3,z+1/2,+1	{ m₁₁₀ \| 0 2/3 1/2 }
18	x+2/3,x-y+2/3,z+1/2,+1	{ m₀₁₀ \| 2/3 2/3 1/2 }
(0,0,1/2)' + set click here to show and hide
19	x,y,z+1/2,-1	{ 1' \| 0 0 1/2 }
20	-y+1/3,x-y+1/3,z+1/2,-1	{ 3'⁺₀₀₁ \| 1/3 1/3 1/2 }
21	-x+y,-x+1/3,z+1/2,-1	{ 3'^-₀₀₁ \| 0 1/3 1/2 }
22	-x+y,y,z,-1	{ m'₁₀₀ \| 0 }
23	-y+1/3,-x+1/3,z,-1	{ m'₁₁₀ \| 1/3 1/3 0 }
24	x,x-y+1/3,z,-1	{ m'₀₁₀ \| 0 1/3 0 }
(1/3,2/3,1/2)' + set click here to show and hide
25	x+1/3,y+2/3,z+1/2,-1	{ 1' \| 1/3 2/3 1/2 }
26	-y+2/3,x-y,z+1/2,-1	{ 3'⁺₀₀₁ \| 2/3 0 1/2 }
27	-x+y+1/3,-x,z+1/2,-1	{ 3'^-₀₀₁ \| 1/3 0 1/2 }
28	-x+y+1/3,y+2/3,z,-1	{ m'₁₀₀ \| 1/3 2/3 0 }
29	-y+2/3,-x,z,-1	{ m'₁₁₀ \| 2/3 0 0 }
30	x+1/3,x-y,z,-1	{ m'₀₁₀ \| 1/3 0 0 }
(2/3,1/3,1/2)' + set click here to show and hide
31	x+2/3,y+1/3,z+1/2,-1	{ 1' \| 2/3 1/3 1/2 }
32	-y,x-y+2/3,z+1/2,-1	{ 3'⁺₀₀₁ \| 0 2/3 1/2 }
33	-x+y+2/3,-x+2/3,z+1/2,-1	{ 3'^-₀₀₁ \| 2/3 2/3 1/2 }
34	-x+y+2/3,y+1/3,z,-1	{ m'₁₀₀ \| 2/3 1/3 0 }
35	-y,-x+2/3,z,-1	{ m'₁₁₀ \| 0 2/3 0 }
36	x+2/3,x-y+2/3,z,-1	{ m'₀₁₀ \| 2/3 2/3 0 }

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Symmetry operations of the magnetic point group in the setting used:

N	(x,y,z)	Seitz notation
1	x,y,z,+1	1
2	-y,x-y,z,+1	3⁺₀₀₁
3	-x+y,-x,z,+1	3^-₀₀₁
4	-x+y,y,z,+1	m₁₀₀
5	-y,-x,z,+1	m₁₁₀
6	x,x-y,z,+1	m₀₁₀
1' + set click here to show and hide
7	x,y,z,-1	1'
8	-y,x-y,z,-1	3'⁺₀₀₁
9	-x+y,-x,z,-1	3'^-₀₀₁
10	-x+y,y,z,-1	m'₁₀₀
11	-y,-x,z,-1	m'₁₁₀
12	x,x-y,z,-1	m'₀₁₀

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Magnetic atoms:

Label	Atom type	x	y	z	Multiplicity	Symmetry constraints on M	M_x	M_y	M_z	\|M\|
Ni1	Ni	0.00000	0.00000	0.25000	18	m_x,2m_x,m_z	1.04	2.08	0.0	1.80

Non-magnetic atoms:

Label	Atom type	x	y	z	Multiplicity
Ba1_1	Ba	0.11111	0.22222	0.83190	6
Ba1_2	Ba	0.44444	0.22222	0.83190	12
Ba1_3	Ba	0.88889	0.77778	0.16810	18
Ba2_1	Ba	0.00000	0.00000	0.00000	18
Nb2_1	Nb	0.11111	0.22222	0.08850	6
Nb2_2	Nb	0.44444	0.22222	0.08850	12
Nb2_3	Nb	0.88889	0.77778	0.91150	18
O1_1	O	0.16667	0.00000	0.00000	36
O1_2	O	0.83333	0.66667	0.00000	18
O2_1	O	0.05660	0.94340	0.16312	36
O2_2	O	0.05660	0.11320	0.16312	18
O2_3	O	0.11320	0.05660	0.83688	36
O2_4	O	0.94340	0.88680	0.83688	18

[Show all atoms in unit cell and their moment relations]

Positions and magnetic moments of all atoms in unit cell, with magnetic moment relations explicitly given:

Magnetic atoms:

Set of atoms in the unit cell related by symmetry with the magnetic atom Ni1:

Atom	x	y	z	Symmetry constraints on M	M_x	M_y	M_z
1	0.00000	0.00000	0.25000	m_x,2m_x,m_z	1.04000	2.08000	0.00000
2	0.33333	0.33333	0.25000	-2m_x,-m_x,m_z	-2.08000	-1.04000	0.00000
3	0.00000	0.33333	0.25000	m_x,-m_x,m_z	1.04000	-1.04000	0.00000
(1/3,2/3,0) + set click here to show and hide
4	0.33333	0.66667	0.25000	m_x,2m_x,m_z	1.04000	2.08000	0.00000
5	0.66667	0.00000	0.25000	-2m_x,-m_x,m_z	-2.08000	-1.04000	0.00000
6	0.33333	0.00000	0.25000	m_x,-m_x,m_z	1.04000	-1.04000	0.00000
(2/3,1/3,0) + set click here to show and hide
7	0.66667	0.33333	0.25000	m_x,2m_x,m_z	1.04000	2.08000	0.00000
8	0.00000	0.66667	0.25000	-2m_x,-m_x,m_z	-2.08000	-1.04000	0.00000
9	0.66667	0.66667	0.25000	m_x,-m_x,m_z	1.04000	-1.04000	0.00000
(0,0,1/2)' + set click here to show and hide
10	0.00000	0.00000	0.75000	-m_x,-2m_x,-m_z	-1.04000	-2.08000	0.00000
11	0.33333	0.33333	0.75000	2m_x,m_x,-m_z	2.08000	1.04000	0.00000
12	0.00000	0.33333	0.75000	-m_x,m_x,-m_z	-1.04000	1.04000	0.00000
(1/3,2/3,1/2)' + set click here to show and hide
13	0.33333	0.66667	0.75000	-m_x,-2m_x,-m_z	-1.04000	-2.08000	0.00000
14	0.66667	0.00000	0.75000	2m_x,m_x,-m_z	2.08000	1.04000	0.00000
15	0.33333	0.00000	0.75000	-m_x,m_x,-m_z	-1.04000	1.04000	0.00000
(2/3,1/3,1/2)' + set click here to show and hide
16	0.66667	0.33333	0.75000	-m_x,-2m_x,-m_z	-1.04000	-2.08000	0.00000
17	0.00000	0.66667	0.75000	2m_x,m_x,-m_z	2.08000	1.04000	0.00000
18	0.66667	0.66667	0.75000	-m_x,m_x,-m_z	-1.04000	1.04000	0.00000

Non-magnetic atoms:

Set of atoms in the unit cell related by symmetry with the atom Ba1_1:

Atom	x	y	z
1	0.11111	0.22222	0.83190
(1/3,2/3,0) + set click here to show and hide
2	0.44444	0.88889	0.83190
(2/3,1/3,0) + set click here to show and hide
3	0.77778	0.55555	0.83190
(0,0,1/2)' + set click here to show and hide
4	0.11111	0.22222	0.33190
(1/3,2/3,1/2)' + set click here to show and hide
5	0.44444	0.88889	0.33190
(2/3,1/3,1/2)' + set click here to show and hide
6	0.77778	0.55555	0.33190

Set of atoms in the unit cell related by symmetry with the atom Ba1_2:

Atom	x	y	z
1	0.44444	0.22222	0.83190
2	0.77778	0.22222	0.33190
(1/3,2/3,0) + set click here to show and hide
3	0.77777	0.88889	0.83190
4	0.11111	0.88889	0.33190
(2/3,1/3,0) + set click here to show and hide
5	0.11111	0.55555	0.83190
6	0.44445	0.55555	0.33190
(0,0,1/2)' + set click here to show and hide
7	0.44444	0.22222	0.33190
8	0.77778	0.22222	0.83190
(1/3,2/3,1/2)' + set click here to show and hide
9	0.77777	0.88889	0.33190
10	0.11111	0.88889	0.83190
(2/3,1/3,1/2)' + set click here to show and hide
11	0.11111	0.55555	0.33190
12	0.44445	0.55555	0.83190

Set of atoms in the unit cell related by symmetry with the atom Ba1_3:

Atom	x	y	z
1	0.88889	0.77778	0.16810
2	0.55555	0.44444	0.16810
3	0.88889	0.44444	0.16810
(1/3,2/3,0) + set click here to show and hide
4	0.22222	0.44445	0.16810
5	0.88889	0.11111	0.16810
6	0.22222	0.11111	0.16810
(2/3,1/3,0) + set click here to show and hide
7	0.55556	0.11111	0.16810
8	0.22222	0.77778	0.16810
9	0.55556	0.77778	0.16810
(0,0,1/2)' + set click here to show and hide
10	0.88889	0.77778	0.66810
11	0.55555	0.44444	0.66810
12	0.88889	0.44444	0.66810
(1/3,2/3,1/2)' + set click here to show and hide
13	0.22222	0.44445	0.66810
14	0.88889	0.11111	0.66810
15	0.22222	0.11111	0.66810
(2/3,1/3,1/2)' + set click here to show and hide
16	0.55556	0.11111	0.66810
17	0.22222	0.77778	0.66810
18	0.55556	0.77778	0.66810

Set of atoms in the unit cell related by symmetry with the atom Ba2_1:

Atom	x	y	z
1	0.00000	0.00000	0.00000
2	0.33333	0.33333	0.00000
3	0.00000	0.33333	0.00000
(1/3,2/3,0) + set click here to show and hide
4	0.33333	0.66667	0.00000
5	0.66667	0.00000	0.00000
6	0.33333	0.00000	0.00000
(2/3,1/3,0) + set click here to show and hide
7	0.66667	0.33333	0.00000
8	0.00000	0.66667	0.00000
9	0.66667	0.66667	0.00000
(0,0,1/2)' + set click here to show and hide
10	0.00000	0.00000	0.50000
11	0.33333	0.33333	0.50000
12	0.00000	0.33333	0.50000
(1/3,2/3,1/2)' + set click here to show and hide
13	0.33333	0.66667	0.50000
14	0.66667	0.00000	0.50000
15	0.33333	0.00000	0.50000
(2/3,1/3,1/2)' + set click here to show and hide
16	0.66667	0.33333	0.50000
17	0.00000	0.66667	0.50000
18	0.66667	0.66667	0.50000

Set of atoms in the unit cell related by symmetry with the atom Nb2_1:

Atom	x	y	z
1	0.11111	0.22222	0.08850
(1/3,2/3,0) + set click here to show and hide
2	0.44444	0.88889	0.08850
(2/3,1/3,0) + set click here to show and hide
3	0.77778	0.55555	0.08850
(0,0,1/2)' + set click here to show and hide
4	0.11111	0.22222	0.58850
(1/3,2/3,1/2)' + set click here to show and hide
5	0.44444	0.88889	0.58850
(2/3,1/3,1/2)' + set click here to show and hide
6	0.77778	0.55555	0.58850

Set of atoms in the unit cell related by symmetry with the atom Nb2_2:

Atom	x	y	z
1	0.44444	0.22222	0.08850
2	0.77778	0.22222	0.58850
(1/3,2/3,0) + set click here to show and hide
3	0.77777	0.88889	0.08850
4	0.11111	0.88889	0.58850
(2/3,1/3,0) + set click here to show and hide
5	0.11111	0.55555	0.08850
6	0.44445	0.55555	0.58850
(0,0,1/2)' + set click here to show and hide
7	0.44444	0.22222	0.58850
8	0.77778	0.22222	0.08850
(1/3,2/3,1/2)' + set click here to show and hide
9	0.77777	0.88889	0.58850
10	0.11111	0.88889	0.08850
(2/3,1/3,1/2)' + set click here to show and hide
11	0.11111	0.55555	0.58850
12	0.44445	0.55555	0.08850

Set of atoms in the unit cell related by symmetry with the atom Nb2_3:

Atom	x	y	z
1	0.88889	0.77778	0.91150
2	0.55555	0.44444	0.91150
3	0.88889	0.44444	0.91150
(1/3,2/3,0) + set click here to show and hide
4	0.22222	0.44445	0.91150
5	0.88889	0.11111	0.91150
6	0.22222	0.11111	0.91150
(2/3,1/3,0) + set click here to show and hide
7	0.55556	0.11111	0.91150
8	0.22222	0.77778	0.91150
9	0.55556	0.77778	0.91150
(0,0,1/2)' + set click here to show and hide
10	0.88889	0.77778	0.41150
11	0.55555	0.44444	0.41150
12	0.88889	0.44444	0.41150
(1/3,2/3,1/2)' + set click here to show and hide
13	0.22222	0.44445	0.41150
14	0.88889	0.11111	0.41150
15	0.22222	0.11111	0.41150
(2/3,1/3,1/2)' + set click here to show and hide
16	0.55556	0.11111	0.41150
17	0.22222	0.77778	0.41150
18	0.55556	0.77778	0.41150

Set of atoms in the unit cell related by symmetry with the atom O1_1:

Atom	x	y	z
1	0.16667	0.00000	0.00000
2	0.33333	0.50000	0.00000
3	0.83333	0.16666	0.00000
4	0.83333	0.00000	0.50000
5	0.33333	0.16666	0.50000
6	0.16667	0.50000	0.50000
(1/3,2/3,0) + set click here to show and hide
7	0.50000	0.66667	0.00000
8	0.66667	0.16667	0.00000
9	0.16666	0.83333	0.00000
10	0.16666	0.66667	0.50000
11	0.66667	0.83333	0.50000
12	0.50000	0.16667	0.50000
(2/3,1/3,0) + set click here to show and hide
13	0.83334	0.33333	0.00000
14	0.00000	0.83334	0.00000
15	0.50000	0.50000	0.00000
16	0.50000	0.33333	0.50000
17	0.00000	0.50000	0.50000
18	0.83334	0.83334	0.50000
(0,0,1/2)' + set click here to show and hide
19	0.16667	0.00000	0.50000
20	0.33333	0.50000	0.50000
21	0.83333	0.16666	0.50000
22	0.83333	0.00000	0.00000
23	0.33333	0.16666	0.00000
24	0.16667	0.50000	0.00000
(1/3,2/3,1/2)' + set click here to show and hide
25	0.50000	0.66667	0.50000
26	0.66667	0.16667	0.50000
27	0.16666	0.83333	0.50000
28	0.16666	0.66667	0.00000
29	0.66667	0.83333	0.00000
30	0.50000	0.16667	0.00000
(2/3,1/3,1/2)' + set click here to show and hide
31	0.83334	0.33333	0.50000
32	0.00000	0.83334	0.50000
33	0.50000	0.50000	0.50000
34	0.50000	0.33333	0.00000
35	0.00000	0.50000	0.00000
36	0.83334	0.83334	0.00000

Set of atoms in the unit cell related by symmetry with the atom O1_2:

Atom	x	y	z
1	0.83333	0.66667	0.00000
2	0.66666	0.49999	0.00000
3	0.83334	0.50000	0.00000
(1/3,2/3,0) + set click here to show and hide
4	0.16666	0.33334	0.00000
5	0.00000	0.16666	0.00000
6	0.16667	0.16667	0.00000
(2/3,1/3,0) + set click here to show and hide
7	0.50000	0.00000	0.00000
8	0.33333	0.83333	0.00000
9	0.50001	0.83334	0.00000
(0,0,1/2)' + set click here to show and hide
10	0.83333	0.66667	0.50000
11	0.66666	0.49999	0.50000
12	0.83334	0.50000	0.50000
(1/3,2/3,1/2)' + set click here to show and hide
13	0.16666	0.33334	0.50000
14	0.00000	0.16666	0.50000
15	0.16667	0.16667	0.50000
(2/3,1/3,1/2)' + set click here to show and hide
16	0.50000	0.00000	0.50000
17	0.33333	0.83333	0.50000
18	0.50001	0.83334	0.50000

Set of atoms in the unit cell related by symmetry with the atom O2_1:

Atom	x	y	z
1	0.05660	0.94340	0.16312
2	0.38993	0.44653	0.16312
3	0.88680	0.27673	0.16312
4	0.88680	0.94340	0.66312
5	0.38993	0.27673	0.66312
6	0.05660	0.44653	0.66312
(1/3,2/3,0) + set click here to show and hide
7	0.38993	0.61007	0.16312
8	0.72327	0.11320	0.16312
9	0.22013	0.94340	0.16312
10	0.22013	0.61007	0.66312
11	0.72327	0.94340	0.66312
12	0.38993	0.11320	0.66312
(2/3,1/3,0) + set click here to show and hide
13	0.72327	0.27673	0.16312
14	0.05660	0.77987	0.16312
15	0.55347	0.61007	0.16312
16	0.55347	0.27673	0.66312
17	0.05660	0.61007	0.66312
18	0.72327	0.77987	0.66312
(0,0,1/2)' + set click here to show and hide
19	0.05660	0.94340	0.66312
20	0.38993	0.44653	0.66312
21	0.88680	0.27673	0.66312
22	0.88680	0.94340	0.16312
23	0.38993	0.27673	0.16312
24	0.05660	0.44653	0.16312
(1/3,2/3,1/2)' + set click here to show and hide
25	0.38993	0.61007	0.66312
26	0.72327	0.11320	0.66312
27	0.22013	0.94340	0.66312
28	0.22013	0.61007	0.16312
29	0.72327	0.94340	0.16312
30	0.38993	0.11320	0.16312
(2/3,1/3,1/2)' + set click here to show and hide
31	0.72327	0.27673	0.66312
32	0.05660	0.77987	0.66312
33	0.55347	0.61007	0.66312
34	0.55347	0.27673	0.16312
35	0.05660	0.61007	0.16312
36	0.72327	0.77987	0.16312

Set of atoms in the unit cell related by symmetry with the atom O2_2:

Atom	x	y	z
1	0.05660	0.11320	0.16312
2	0.22013	0.27673	0.16312
3	0.05660	0.27673	0.16312
(1/3,2/3,0) + set click here to show and hide
4	0.38993	0.77987	0.16312
5	0.55347	0.94340	0.16312
6	0.38993	0.94340	0.16312
(2/3,1/3,0) + set click here to show and hide
7	0.72327	0.44653	0.16312
8	0.88680	0.61007	0.16312
9	0.72327	0.61007	0.16312
(0,0,1/2)' + set click here to show and hide
10	0.05660	0.11320	0.66312
11	0.22013	0.27673	0.66312
12	0.05660	0.27673	0.66312
(1/3,2/3,1/2)' + set click here to show and hide
13	0.38993	0.77987	0.66312
14	0.55347	0.94340	0.66312
15	0.38993	0.94340	0.66312
(2/3,1/3,1/2)' + set click here to show and hide
16	0.72327	0.44653	0.66312
17	0.88680	0.61007	0.66312
18	0.72327	0.61007	0.66312

Set of atoms in the unit cell related by symmetry with the atom O2_3:

Atom	x	y	z
1	0.11320	0.05660	0.83688
2	0.27673	0.38993	0.83688
3	0.94340	0.22013	0.83688
4	0.94340	0.05660	0.33688
5	0.27673	0.22013	0.33688
6	0.11320	0.38993	0.33688
(1/3,2/3,0) + set click here to show and hide
7	0.44653	0.72327	0.83688
8	0.61007	0.05660	0.83688
9	0.27673	0.88680	0.83688
10	0.27673	0.72327	0.33688
11	0.61007	0.88680	0.33688
12	0.44653	0.05660	0.33688
(2/3,1/3,0) + set click here to show and hide
13	0.77987	0.38993	0.83688
14	0.94340	0.72327	0.83688
15	0.61007	0.55347	0.83688
16	0.61007	0.38993	0.33688
17	0.94340	0.55347	0.33688
18	0.77987	0.72327	0.33688
(0,0,1/2)' + set click here to show and hide
19	0.11320	0.05660	0.33688
20	0.27673	0.38993	0.33688
21	0.94340	0.22013	0.33688
22	0.94340	0.05660	0.83688
23	0.27673	0.22013	0.83688
24	0.11320	0.38993	0.83688
(1/3,2/3,1/2)' + set click here to show and hide
25	0.44653	0.72327	0.33688
26	0.61007	0.05660	0.33688
27	0.27673	0.88680	0.33688
28	0.27673	0.72327	0.83688
29	0.61007	0.88680	0.83688
30	0.44653	0.05660	0.83688
(2/3,1/3,1/2)' + set click here to show and hide
31	0.77987	0.38993	0.33688
32	0.94340	0.72327	0.33688
33	0.61007	0.55347	0.33688
34	0.61007	0.38993	0.83688
35	0.94340	0.55347	0.83688
36	0.77987	0.72327	0.83688

Set of atoms in the unit cell related by symmetry with the atom O2_4:

Atom	x	y	z
1	0.94340	0.88680	0.83688
2	0.44653	0.38993	0.83688
3	0.94340	0.38993	0.83688
(1/3,2/3,0) + set click here to show and hide
4	0.27673	0.55347	0.83688
5	0.77987	0.05660	0.83688
6	0.27673	0.05660	0.83688
(2/3,1/3,0) + set click here to show and hide
7	0.61007	0.22013	0.83688
8	0.11320	0.72327	0.83688
9	0.61007	0.72327	0.83688
(0,0,1/2)' + set click here to show and hide
10	0.94340	0.88680	0.33688
11	0.44653	0.38993	0.33688
12	0.94340	0.38993	0.33688
(1/3,2/3,1/2)' + set click here to show and hide
13	0.27673	0.55347	0.33688
14	0.77987	0.05660	0.33688
15	0.27673	0.05660	0.33688
(2/3,1/3,1/2)' + set click here to show and hide
16	0.61007	0.22013	0.33688
17	0.11320	0.72327	0.33688
18	0.61007	0.72327	0.33688

[Hide]

Label	Atom type	x	y	z	Multiplicity	Symmetry constraints on M	M_x	M_y	M_z	\|M\|
Ni1	Ni	0.00000	0.00000	0.25000	18	m_x,2m_x,m_z	1.04	2.08	0.0	1.80

[Show all magnetic atoms in unit cell and their moment relations]

label	dim. full irrep	dim. small irrep	direction	action	number of modes
mH3	4	2	special	primary	1
mA1-	1	1		secondary	1

MAGNDATA: A Collection of magnetic structures with portable cif-type files

Ba₃Nb₂NiO₉ (#1.13)

MAGNDATA: A Collection of magnetic structures with portable cif-type files

Ba3Nb2NiO9 (#1.13)

Ba₃Nb₂NiO₉ (#1.13)