Manganese-doped bismuth vanadate solid electrolytes.
Abstract
The total electrical conductivities of a series of
manganese-substituted bismuth vanadates,
(Bi
2
V
1-x
Mn
x
O
5.5-x
; 0.15≤x≤0.25) with the
tetragonal (γ) structure have been measured using two-probe ac
impedance spectroscopy. The conductivity data do not show simple Arrhenius
behaviour. A linear variation of log(σT)vs.
1/Tis observed at low and high temperatures but at intermediate
temperatures some curvature is apparent in the data, particularly
whenx=0.2. Changes in conductivity with p(O
2
)
indicate that the materials have mixed conductivity. Activation energies
and pre-exponential factors for the linear regions have been determined
for selected compositions at various p(O
2
) values. The
total conductivity varies little with the extent of substitution of V by
Mn. The results are compared with data for other γ-BIMEVOX
systems.
Please wait while we load your content...
