Low Temperature (NH₃CH₃)Al(SO₄)₂ cdot 12H₂O

Unit cell

Lattice constants

a = 12.570 Å, b = 12.330 Å, c = 12.380 Å; α = 90.00°, β = 90.00°, γ = 90.00°

Cell volume

1918.8 ų

Atoms in the conventional cell

220 (Al 4, C 4, H 120, N 4, O 80, S 8)

Formula units Z

4

Pearson symbol

oP220 — orthorhombic, primitive lattice, 220 atoms per conventional cell

Symmetry operations

4 per cell

Crystallographic sites

The multiplicity and the Wyckoff letter say how many copies of the site the group makes in one cell and on which kind of symmetry element the site sits; the 220 atoms drawn above are these sites multiplied by all 4 operations. Press Wyckoff under Colour to see the sites, and tick a symmetry element on the left to see which atoms lie on it.

How to read the label

ABC30DE20F2_oP220_29_a_a_30a_a_20a_2a-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oP220, then the space-group number 29, then the Wyckoff letters occupied by each element in turn (Al: 4a; C: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; H: 4a; N: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; O: 4a; S: 4a; S: 4a). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Note: LT Alum.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC30DE20F2_oP220_29_a_a_30a_a_20a_2a-001 (M. J. Mehl et al., Comput. Mater. Sci. 136, S1 (2017); D. Hicks et al., ibid. 161, S1 (2019) and 199, 110450 (2021); S. Eckert et al., ibid. 240, 112988 (2024)). Symmetry elements, Wyckoff assignment and the diagram are computed on this page from the group operations.