Abstract
The PbMnO3– x system has a great number of phases with large unit cells for different values of x. In the present work, we study a PbMnO2.75 phase that has proven too complex to be solved by X-ray powder diffraction. Using electron crystallography, we have determined the positions of all metal atoms without the necessity of using a model as a starting point. The results correspond, within experimental uncertainties, to those obtained by Bougerol et al. (J. Solid State Chem. 169 131 (2002)).
Acknowledgements
We thank C. Bougerol, Grenoble, France, for providing samples and giving access to their results prior to publication.