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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 26, Number 3
JKCSEZ 26(3)
June 20, 1982 

Defect Structure and Electrical Conduction Mechanism of Manganese Oxide-Titanium Dioxide

산화망간-이산화티탄계의 결함구조 및 전기전도메카니즘
Keu Hong Kim, Jae Shi Choi

김규홍, 최재시
0.40, 0.80 및 1.60 mol %의 산화망간을 함유한 이산화티탄의 전기전도도를 10-8 ~ 10-1 atm의 산소분압하에서 100 ~ 400℃ 및 1100 ~ 1300℃의 온도에서 측정하였다. 일정한 산소분압하에서 측정된 전기전도도 값을 온도의 역수에 대하여 도시한 결과 저온 및 고온 영역에서 직선관계를 나타내었으며 활성화에너지는 각각 0.18 및 3.70eV이다. 전기전도도의 산소분압 의존성은 저온영역에서 -1/6이며 고온 영역에서 -1/4이다. 저온 영역과 고온영역에서의 결함구조가 각각(Vo-2e') 및 Ti3·임을 밝혔으며 전기전도 메카니즘과 가능한 전도띠 모델이 제안되었다.

The electrical conductivity of n-type polycrystalline MnOx-TiO2 system containing 0.40, 0.80, and 1.60 mol % of manganese oxide has been measured from 100 to 400℃ and 1100 to 1300℃ under oxygen partial pressures of 10-8 to 10-1 atm. Plots of log conductivity vs. reciprocals of absolute temperature at constant PO2's are found to be linear with an inflection, and the activation energies obtained from the slopes appear to be an enough average 0.18eV for the extrinsic and 3.70eV for the intrinsic. The log σ vs. log PO2 are found to be linear at PO2's of 10-8 to 10-1 atm. The conductivity dependences on PO2 at the two temperature regions are closely approximated by σ∝PO2-1/6 for the extrinsic and σ∝PO2-1/4 for the intrinsic, respectively. The predominant defects are believed to be Vo-2e' and Ti3· interstitial at the extrinsic and intrinsic. From the interpretations of conductivity dependences on temperature and PO2, the conduction mechanisms and possible band models are proposed.

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