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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 7, Number 5
May 20, 1986 

Transport Mechanisms and Defect Structures of the System α-Fe2O3-CoO
Keu Hong Kim*, Sung Han Lee, Jae Shi Choi
The electrical conductivity of the system α -Fe2O3-CoO was measured in the temperature range 200-1000℃ and PO2 range 10-7∼2 × 10-1 atm. Possible defect models were suggested on the basis of conductivity data, which were measured as a function of temperature and of oxygen partial pressure. The observed activation energies were 0.50 eV and 1.01 eV in the low- and high-temperature regions, respectively. The observed conductivity dependences on PO2 were σ α PO2-1/6 in the PO2 range 10-7-10-4 atm and σα PO2-1/4 at PO2's of 10-4-2 × 10-1 atm at temperatures from 300-1000℃. An extrinsic electron conduction due to an Vo defect and an intrinsic electron conduction due to an Fei' defect were suggested at different temperature and oxygen partial pressure regions, respectively.
341 - 346
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