The crystal structure of a novel pyrophosphate WP2O7 has been studied by X-
ray powder diffraction. It was found that the crystal structure of WP2O7, b
elongs to the well-known MoP2O7 structure type (a = 7.9502 Angstrom). The t
etravalent state of tungsten in the pyrophosphate has been confirmed by mag
netic susceptibility measurements. (C) 2000 Elsevier Science S.A. All right
s reserved.