ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The electrical resistivity, ϱ, and Seebeck coefficient, α, for the system Cu1+xSixFe2−2xO4 (where x = 0.05, 0.1, 0.15, 0.2 and 0.3) have been studied as a function of temperature. Temperature variation of the resistivity exhibits two breaks. Each break is associated with a change in activation energy. The conduction process at low temperature is governed by the reaction Cu A 1+ + Cu A 2+ →Cu A 2+ + Cu A 1+ . However, at higher temperature, it is due to intersite cation exchange and reoxidation such as Cu A 2+ + Fe B 3+ → Cu B 2+ + Fe A 3+ . Measurement of the Seebeck coefficient, α, from room temperature to 800 K reveals n-type conduction for the sample with x= 0.05, while the measurements for other samples show p-type conduction for lower temperatures and n-type conduction at higher temperatures. The activation energies in the paramagnetic region are found to be less than those in the ferrimagnetic region.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00356590
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