Predicted High-Pressure YCaH₁₂ CaH₁₂Y

Unit cell

Lattice constants

a = 3.471 Å, b = 3.471 Å, c = 3.471 Å; α = 90.00°, β = 90.00°, γ = 90.00°

Cell volume

41.8 ų

Atoms in the conventional cell

14 (Ca 1, Y 1, H 12)

Formula units Z

1

Pearson symbol

cP14 — cubic, primitive lattice, 14 atoms per conventional cell

Symmetry operations

48 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 14 atoms drawn above are these sites multiplied by all 48 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

AB12C_cP14_221_a_h_b-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol cP14, then the space-group number 221, then the Wyckoff letters occupied by each element in turn (Ca: 1a; Y: 1b; H: 12h). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Note: Predicted HP.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry AB12C_cP14_221_a_h_b-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.