Abstract
Iron and bismuth molybdovanadates of general formula Bi 1 − x 3 x 3 − y Me y( V 1 − x Mo x − y Fe y) O 4, where Me = Fe or Bi , □ = cation vacancy, with x = 0.15, 0.30, 0.45, 0.60, and 0.75 and 0 ⩽ y ⩽ x 3 , have been prepared by coprecipitation and final firing at 873 K. The structural characterization has been performed mainly by precise lattice parameter measurements but also by magnetic susceptibility studies. The X-ray data show that all specimens are monophasic with the scheelite tetragonal structure. The correlation between the lattice parameter a and compositional parameters x and y shows the effect of the cation and vacancy substitution on the unit cell lattice, which is interpreted in terms of the different ionic radii of the interchanging metal ions.
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