WO 3 -doped Bi 2 O 3 was found to exhibit stable fluorite-based structure. However, the electrical conductivity of WO 3 -doped Bi 2 O 3 is significantly lower than that of Y 2 O 3 -doped Bi 2 O 3 . The structure and electrical conductivity of samples formulated as (Y X W 0.15 Bi 0.85-X ) 2 O 3.45 (X=0.1~0.4) were investigated. The assintered (Y 0.1 W 0.15 Bi 0.75 ) 2 O 3.45 exhibited a single cubic structure that is isostructural with δ-Bi 2 O 3 . However, the cubic fluorite structure may decompose into cubic structure and rhombohedral Y 6 WO 12 after heat-treatment at 900°C for 3 hours. For X=0.2, 0.3 and 0.4, the as-sintered samples consisted of a cubic fluorite structure and rhombohedral Y 6 WO 12 . The conductivities of (Y X W 0.15 Bi 0.85-X ) 2 O 3.45 (X=0.1~0.4) decrease with increasing X value. For X=0.1, the conductivity is 1.97 × 10 -3 S cm -1 at 700°C and slightly lower than that of (W 0.15 Bi 0.85 ) 2 O 3.45 . The Bi 6s 2 lone pairs of electrons are known to lead to enough oxygen ion mobility. Thus it is reasonable to expect that ionic conductivity drops as Y substitutes for Bi.
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