Abstract
A new series of phosphate tungsten bronzes P 4O 8(WO 3) 2m has been investigated by X-ray and electron diffraction and electron microscopy. The structure of these phases is derived from that of P 4W 8O 32 which corresponds to the fourth member of the series: it is thus built up from ReO 3 type slabs separated by planes of PO 4 tetrahedra forming empty pentagonal tunnels. The electron diffraction and microscopy study of the integral m compositions has shown the existence of the different members of the series, ranging from m = 4 to 16, in the form of pure ordered microcrystals. Most of the members of the series except m = 5 are characterized by an orthorhombic cell related to that of ReO 3 in the following way: ▪
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