W. Kraus et G. Nolze, POWDER CELL - A PROGRAM FOR THE REPRESENTATION AND MANIPULATION OF CRYSTAL-STRUCTURES AND CALCULATION OF THE RESULTING X-RAY-POWDER PATTERNS, Journal of applied crystallography, 29, 1996, pp. 301-303
The main component of this program is a simultaneous representation of
the unit cell and the calculated powder pattern. It allows the manipu
lation of the crystal structure by moving selected atoms of the asymme
tric unit. The resulting powder pattern can be directly compared to ex
perimental data in order to obtain reliable starting values for furthe
r computations in refinement programs.