Neutron and X-ray scattering on Li-doped BPO4

The structure of pure BPO4 and Li-doped BPO4 has been studied by neutron an d X-ray scattering. Rietveld refinement of the neutron and X-ray spectra of the doped material did not show additional phases or a lithium superstruct ure. It appears that the interstitial Li+-ions as well as the charge compen sating boron vacancies and substitutionally incorporated Li+-ions on boron sites are randomly distributed over the lattice resulting only in a slight change in peak intensities. The relevance of QENS for ceramic Li-ion batter ies is discussed. (C) 1999 Elsevier Science B.V. All rights reserved.