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Bulletin of the Korean Chemical Society (BKCS)

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

 
Title
Transport Mechanisms and Defect Structures of the System α-Fe2O3-CoO
Author
Keu Hong Kim*, Sung Han Lee, Jae Shi Choi
Keywords
Abstract
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.
Page
341 - 346
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