LEPAGE

SYMMETRY TOOLS

PLATON HOMEPAGE

LEPAGE (mang[0.3]) (MaxDot[2]) (TwoAxCrit[0.5])

The LEPAGE option in PLATON checks for possible higher metrical symmetry of the lattice (following the excellent algorithm published by Y. LePage, but coded independently from scratch).

mang is an optional parameter setting an alternative angular maximum deviation from metrical symmetry [default 0.3 degree].

MaxDot values greater than 2 may indicate non-merohedral twinning. The maximum value is 6.

TwoAxCrit is a parameter determining whether a lattice vector 'coincides' with a reciprocal lattice vector [default 0.5 Degree].

What is needed to run PLATON/LEPAGE is a small file ('x.spf') with the following data/instructions

TITL text
CELL a b c alpha beta gamma
SPGR space group name (Can be the Laue equivalent)
LEPAGE

and run with the instruction: platon x.spf

Note: The Spacegroup information is used only to pick-up the current lattice centering type. The alternative LATTICE instruction (i.e. LATT C for Spacegroup C2/c) would be sufficient.

Example of 'x.spf' (triclinic to cubic I)

TITL look for metrical symmetry
CELL 10 10 10 109.5 109.5 109.5
LATT P
LEPAGE

Alternatively, provide a RES, CIF, CSD or SPF structured dataset to PLATON and invoke LEPAGE by clicking on the LEPAGE button in the PLATON opening menu or with the instruction LEPAGE from the keyboard interface.

SYMMETRY TOOLS

PLATON HOMEPAGE