α-Potassium Nitrate (KNO₃) Structure II: ABC3_oC80_36_2ab_2ab_2a5b-001

Unit cell

Lattice constants

a = 10.825 Å, b = 18.351 Å, c = 6.435 Å; α = 90.00°, β = 90.00°, γ = 90.00°

Cell volume

1278.3 ų

Atoms in the conventional cell

80 (K 16, N 16, O 48)

Formula units Z

16

Pearson symbol

oC80 — orthorhombic, base-centred lattice, 80 atoms per conventional cell

Symmetry operations

8 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 80 atoms drawn above are these sites multiplied by all 8 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

ABC3_oC80_36_2ab_2ab_2a5b-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol oC80, then the space-group number 36, then the Wyckoff letters occupied by each element in turn (K: 4a; K: 4a; N: 4a; N: 4a; O: 4a; O: 4a; K: 8b; N: 8b; O: 8b; O: 8b; O: 8b; O: 8b; O: 8b). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Note: α-KNO₃ Structure II.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry ABC3_oC80_36_2ab_2ab_2a5b-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.