Abstract

VERA, C.M.C  and  CINSO et al. Conductimetric Response linearity in γ'-Bi₂Mo0₆. Rev. mex. fis. [online]. 2006, vol.52, suppl.2, pp.20-22. ISSN 0035-001X.

Requisite conditions for electrical conductivity measurements in γ'-Bi₂MoO₆ are reviewed, to optimize its application as a conductimetric chemical sensor. Constant voltage DC electrical resistivity and AC complex impedance measurements demonstrate that: (1) ohmic behavior is limited to a 50 mV maximum voltage drop; (2) the influence of electrode polarization phenomena may be minimized by low frequency (10 Hz) AC measurements; (3) above 450°C, electrical conduction is dominated by intracrystalline conduction; (4) below this operating temperature, the influence of surface and electronic conduction inhibit sensitivity and selectivity; (5) low frequency AC measurements with 50 mV rms excitation reflect changes in the partial pressure of oxygen.

Keywords : Bismuth Molybdates; conductimetric chemical sensors; oxygen ionic conduction.