The phenomenon of 6-phase stabilization in the systems (Bi,03)o.75(RZ03)0.25 where R = lanthanide metal (including La, but Pm excepted) was investigated. The electrical conductivity of those systems, which did show 6-stabilization, was investigated; the system (BiZ03)1_-X(YbZ03)X was studied in more detail. A Vegard-like relation between the cubic cell-axis and cationic radius of the substituted trivalent metal ion was found. A model is presented which accounts for results of electrical conductivity measurements and thermogalvanic measurements as well.

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The thermogalvanic power E (Seebeck coefficient) of 02-conducting s-Biz03 and 6-(Bi203)1_x(Y203)x has been measured directly as a function of temperature and partial oxygen pressure in N2 -02 mixtures. The E of 6-(Bi 2 3 0 ) ,,.75&03h,.25 with R = Tb-Lu was indirectly determined using an isothermal concentration cell technique. Except for pure 6-Bi20,, the heat of transport is much smaller than the activation energy for 02-conduction for all materials. The vibrational freedom of 02-ions in all L-stabilized materials is reflected in their IR spectra at room temperature. Two prototypes of a thermogalvanic POZ meter were tested.