Mechanochemical synthesis, crystal structure, and electrical conductivity of Bi₂M_0.1V_0.9O_{5.5 - x} (M = V, Zn, Sc, Sb, In) and Bi_1.8Pb_0.2VO_{5.4 - x} metastable solid solutions

Author： Zyryanov V. Uvarov N.

Publisher： MAIK Nauka/Interperiodica

ISSN： 0020-1685

Source： Inorganic Materials, Vol.41, Iss.3, 2005-03, pp. : 281-287

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Abstract

Metastable BIMEVOX solid solutions with the γ-Bi₂VO_{5.5 - x} structure (Aurivillius phases) and nominal compositions Bi₂M_0.1V_0.9O_{5.5 - x} (M = V, Zn, Sc, Sb, In) and Bi_1.8Pb_0.2VO_{5.4 - x} are prepared for the first time by mechanochemical synthesis. Structural studies of these materials reveal high vacancy concentrations and substitutional disordering. Sintering at 1000 K ensures only partial elimination of these defects. The phase transformation which occurs in equilibrium BIMEVOX compounds at about 750 K is not detected in the metastable materials by thermal analysis, in agreement with structural data. The In- and Pb-doped solid solutions partially decompose during sintering. The 720-K oxygen ionic conductivity of the Zn-, Sc-, and Sb-doped metastable ceramics in air is slightly lower than the best values reported in the literature.