Filled skutterudite compounds, Ba
yFe
xCo
4-xSb
12 (x=0-3.0, y=0-0.7), were synthesized by a two step solid state reaction method. Electrical transport properties of Ba
yFe
xCo
4-xSb
12 were investigated. The lattice constants of Ba
yFe
xCo
4-xSb
12 increased with increasing Ba filling fraction and Fe content. The maximum filling fraction of Ba (y
max) in Ba
yFe
xCo
4-xSb
12 increased with increasing Fe content, and was found to be rather greater than that of Ce
yFe
x Co
4-xSb
12. The y
max, varied from 0.35 to near 1.0 when Fe content (x) changed from 0 to 4.0. Carrier concentration and electrical conductivity increased with increasing Fe content, and decreased with increasing Ba filling fraction for Ba
yFe
xCo
4-xSb
12. At the same x and y, carrier concentration and electrical conductivity of Ba
yFe
xCo
4-xSb
12 were larger than that of Ce
yFe
xCo
4-xSb
12.
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