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2 Materials Science Poland

2 2006

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Structure and electrical properties of oxide-ion conductors in the Bi3NbO7-Bi3YO6 system

Kozanecka-Szmigiel A., Krok F., Abrahams I., Wrobel W., Chan S.C.M., Dygas J.R.

Materials Science Poland

2006

Vol. 24, No. 1

31--37

A study of the structure and electrical conductivity of Bi3Nb1-xYxO7-x is presented. X-ray diffraction confirms full solid solution formation in this system, with the adoption of a fluorite-type structure. Superlattice ordering of the anion sublattice is evident in neutron diffraction data, the nature of which varies with composition. At low values of x, long-range ordering is present, whereas above x = 0.4 only local ordering is observed. Arrhenius plots of the total electrical conductivity of all samples containing yttrium show two linear regions with different activation energies, with evidence for a phase transition between 450 and 680 °C.

Bi8V2O17 - a stable phase in the Bi2O3-V2O5 system

Wrobel W., Krok F., Abrahams I., Kozanecka-Szmigiel A., Malys M., Chan S.C.M., Dygas J.R.

Materials Science Poland

2006

Vol. 24, No. 1

23--30

Bi8V2O17 is commonly observed as an intermediate phase in the synthesis of compounds in ternary systems of the type Bi2O3-V2O5-MexOy. It is also seen as an end product at particular compositions in these systems. A rhombohedral substructure model for this phase is presented along with electrical parameters. Evidence from the Arrhenius plot suggests a phase transition at around 550 °C. The existence of a limited solid solution of Bi8V2O17 with ZrO2 is also discussed.