Indexing t-AlF3

Neutron thermodiffractometry
of an amorphous AlF3.xH2O :

Negative result from a PDF-2 search by EVA-2 :


TREOR90/ITO/DICVOL91 results

Consistent with a tetragonal cell
although many orthorhombic or even cubic cells were proposed.

By carefully examining the data, then the space groups P4/nmm or P4/n were obvious.

The cell confirmation was concluded by the Le Bail method :