radtools.RHL#

radtools.RHL(a: float, alpha: float, return_cell=False)[source]#

Construct rhombohedral primitive lattice.

See Rhombohedral (RHL) for the definition of primitive and conventional cells.

Condition \(\alpha < 120^{\circ}\) is assumed.

Parameters:

afloat: Length of the lattice vector of the conventional cell.
alphafloat: Angle between vectors \(a_2\) and \(a_3\) of the conventional cell. In degrees.
return_cellbool, default False: Whether to return the cell instead of the Lattice object.

Returns:

latticeLattice or (3, 3) numpy.ndarray: Rhombohedral lattice or cell.