Vanadium pentoxide gels:: I. Structural study by electron diffraction

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Abstract

Vanadium pentoxide gels consist of entangled polymeric fibers. Electron diffraction experiments have shown that these fibers are actually arranged as flat ribbons about 103 Å long, 102 Å wide, and 10 Å thick. A two-dimensional order is observed along these ribbons which does not vary upon swelling. The two-dimensional cell parameters a = 27.0 Å and b = 3.6Å suggest that the organization within the fibers is closely related to the lamellar structure of orthorhombic V2O5. The fiber is made of basic blocks containing 10 vanadium atoms along the a direction. These blocks seem to be linked together by water molecules which are strongly bonded to the structure and cannot be removed without crystallization of the xerogel into orthorhombic V2O5.

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