The tetragonal β-phase in the binary system of (Bi2O3)1−x(Sm2O3)x was synthesized

by solid-state reaction with doping Sm2O3 into the monoclinic Bi2O3, in

stoichiometric ratios ranging from x = 0.01 to 0.10. The X-ray powder diffraction

data showed that the unit-cell parameters, of the tetragonal-type materials

produced, increased with increasing doping with Sm2O3. The total electrical

conductivity was measured as a function of temperature and doping concentration.

A Bi2O3-based ceramic system, doped with Sm2O3, exhibited an oxide anionic-type

electrical conductivity which increased with increases in dopant concentration and

temperature. In the entire system, the highest value of conductivity, 0.029S/cm,

was observed at 670C for a composition with 7mol%Sm2O3. The phase transition, which manifested itself as a jump in the conductivity curves, was also verified by

DTA measurements which were in good agreement with the observed electrical

conduction results. The electrical conductivity curves revealed a regular increase,

with temperature, in the form of an Arrhenius-type behavior.

Measurement and Properties of the Oxide Ionic Conductivity of β-Phase in the

Binary System of (Bi2O3)1−x(Sm2O3)x. S.Yilmaz, O.Turkoglu, I.Belenli: Materials

Chemistry and Physics, 2008, 112[2], 472-7