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KMID : 1059519890330010025
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Journal of the Korean Chemical Society
1989 Volume.33 No. 1 p.25 ~ p.30
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Nonstoichiometry of the Thulium Sesquioxide
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Yo Chul-Hyun
Lee Eun-Seok
Pyon Woong-Bum
Choi Jae-Shi
Pyun Mu-Sil
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Abstract
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The nonstoichiometry and electrical conductivities of Tm2O3 were studied in the oxygen pressure 2 × l0-1 ∼ 1 × l0-4 atm under the temperature ranges from 700 to 1100℃. The x values of TmO1.5 were varied in the ranges of 0.1004∼0.0110. The enthalpies of formation of the nonstoichiometric compounds were found to be 5.40-4.71 kcal/mole, and the average activation energy obtained from the plots of log conductivity vs. 1000/T was 1.65 eV. The PO2 dependencies of the electrical conductivity were found to be linear and closely approaximated to σα PO21/5.3 in the temperature range 700∼1100℃. The nonstoichiometry and the electrical conductivity are due to trivalent metal vacancies.
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KEYWORD
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