Co1-xMnxFe2O4 spinels were synthesized at 1080 degrees C in air as bulk pha
ses. The lattice parameters increase with the addition of Mn cation, which
is closely related to the effective substitution of Mn2+ cation. From the m
easurements of the magnetic moment, it is shown that Mn contributes to the
canted magnetic moment between tetrahedral (A) and octahedral (B) sites, ex
cept for the sample with x = 0.2. The n-type conduction was observed from S
eebeck coefficient measurements: this is ascribed the formation of Co3+ + e
(-) and Mn3+ + e(-) from Co2+ and Mn2+ cations on A and B sites. The electr
ical conductivities increase with Mn substitution. It is suggested that the
possibility of charge transfer between 2+ and 3+ cation in A as well as B
sites may contribute to electrical conductivity. (C) 1998 Elsevier Science
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