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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 6, Number 1
January 20, 1985 

Transport Mechanisms of Holmium Sesquioxide-Yttrium Sesquioxide System
Keu Hong Kim, Sung Ho Park, Hui Jun Won, Jae Shi Choi
Electrical conductivites of polycrystalline yttrium sesquioxides containing 1.6 and 3.2 mol % of holmium sesquioxdes have been measured from 650 to 1050℃ under oxygen partial pressures of 1 × 10-5 to 2 × 10-1 atm. Plots of log conductivity vs. 1/T at constant oxygen partial pressures are found to be linear away from the two inflection points. The low- and high-temperature dependences of conductivity show different defect structures of yttrium sesquioxide. The plots of log conductivity vs. log PO2 are found to be linear at PO2's of 10-5 to 10-1 atm. The electrical conductivity dependences on PO2 are found to be 1/5.3 at 950-1050℃, 1/6 at 800-950℃ and (1/6.2) - (1/6.5) at 650-800℃, respectively. The defect structures and conduction mechanisms have been suggested.
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