Abstract
New pyrochlore solid solutions Bi 1.5 Sb 1.5– x Nb x CuO 7 have been synthesized (0 ≤ x ≤ 1.5) via the ceramic method in the air at 1000 °C. Rietveld refinement of the compounds Bi 1.5 Sb 1.5– x Nb x CuO 7 for x = 0, x = 0.75 and x = 1.5 by means of X-ray powder diffraction analysis confirmed an overall A 2 B 2 O 7 cubic pyrochlore structure according to (Bi 3+ 1.5 Cu 2+ 0.5 )(Sb 5+ 1.5– x Nb 5+ x Cu 2+ 0.5 )O 7 formula with 10.42009 (3) Å, 10.47193 (3) Å and 10.52679(4) Å, respectively, and F d 3 ¯ m space group. Composition dependencies of cell parameters show a linear increase with the niobium x fraction. The magnetic susceptibility measurements achieved between 4 and 400 K indicate a paramagnetic behavior with an oxidation state “+2” for the copper ion. The electric resistivity measured using complex impedance spectroscopy evidences an increase of the electric conductivity with temperature and niobium substitution.
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