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A reappraisal of fast ion conduction in Ta, Ga, and Al-substituted Aurivillius phases
Ist Teil von
Solid state ionics, 2005-11, Vol.176 (35), p.2617-2623
Ort / Verlag
United States: Elsevier B.V
Erscheinungsjahr
2005
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Oxygen ion conduction in the Aurivillius phases Bi
2Sr
2(Nb or Ta)
2(Ga or Al)O
11.5 has been evaluated in detail. High-temperature X-ray diffraction studies, coupled with differential scanning calorimetry, electron microscopy, and conductivity measurements were used to clearly demonstrate that Bi
2Sr
2(Nb
x
Ta
1−
x
)
2(Ga
y
Al
1−
y
)O
11.5 with
x
=
0, 1 and
y
=
0, 0.5, and 1 form only multiphase specimens. The origin of the previously observed fast ion conduction is a result of interconnected Bi
2O
3 grains that undergo a high-temperature phase transformation to the δ-Bi
2O
3 polymorph. The Aurivillius phase component of the multiphase specimens does not demonstrate any type of order–disorder transformation, however, the phase transformations of the Bi
2O
3 are clearly observed using high-temperature diffraction and calorimetry.