At high temperature, La 2 Mo 2 O 9 has a structure closely related to cubic -SnWO

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At high temperature, La2Mo2O9 has a structure closely related to cubic β-SnWO4, which contains WO4 tetrahedra and Sn in a distorted six-coordinate environment. On cooling through 580 °C, a 2a × 3b × 4c monoclinic superstructure is formed. Correlate these observations with the conductivity data in Figure 13.18, and suggest a mechanism for conductivity above 580 °C.

Figure 13.18

log(o) (S/cm) -1 -2 -3 -4 -5 -6 0.7 900 700 coo temperature (C) 500 1.0 BiE403 Bain0 BizVosCuo.105.35 300

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Solid State Materials Chemistry

ISBN: 9780521873253

1st Edition

Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt

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