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- W2003443539 abstract "Abstract Structure and electrical behaviour are reported for the system Bi 1- x Ta x O 1.5 + x (0.167 ≤ x ≤ 0.250). In the compositional range 0.200 x ≤ 0.250 an incommensurately modulated pseudo-cubic phase (type II) is observed, with the appearance of a larger pseudo-cubic phase in the region 0.167 ≤ x ≤ 0.200. Structural analysis of the type II phases by neutron diffraction reveals subtle changes in the oxide ion distribution with temperature, associated with changes in the incommensurate modulation parameter. Analysis of the defect structure of the type II phase reveals chains of tantalate octahedra as a likely structural motif. It is proposed that these chains facilitate an electronic contribution to total conductivity at low temperatures through electron hopping along the chains. Changes in oxide ion vacancy ordering may explain the observed non-linear behaviour in the thermal expansion of lattice parameter and Arrhenius plots of total conductivity." @default.
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- W2003443539 date "2011-11-01" @default.
- W2003443539 modified "2023-09-27" @default.
- W2003443539 title "Ordered fluorite phases in the Bi2O3-Ta2O5 system: A structural and electrical investigation" @default.
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- W2003443539 doi "https://doi.org/10.1016/j.ssi.2011.08.009" @default.
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