Mixed Ionic and Electronic Conductivity of Lanthanum Sesquioxide 


Vol. 31,  No. 4, pp. 301-307, Aug.  1987


PDF
  Abstract

600℃ ~ 1,050℃와 1 × 10-6 ~ 1 × 102 torr에서 고순도의 La2O3의 전기전도도가 연구되었다. 결합구조 및 반도체형이 온도 및 산소분압의 함수로 연구되었으며 위의 온도 및 산소압력의 영역에서 La2O3의 전도도값은 1 × 10-9 to 1 × 10-3 ohm-l·cm-1 로 나타났다. 전기전도도의 산소압력의존성은 700℃에서 5.7, 1,000℃에서 5.3이며 700℃이하의 낮은 오도영역에서는 9~14의 값은 나타내었다. 온도 감소에 따른 n값의 증가는 α- La2O3의 전기전도가 단순한 전도메카니즘을 나타내지 않는다는 사실을 보여준다. 낮은 산소압력에서 전기운반체는 금속공위가 아니라 산소이온이다. 또한 낮은 온도영역에서 전기전도는 이온성을 띄며 높은 온도영역에서는 전자전도성을 나타낸다. The electrical conductivity of highly pure polycrystalline sample of La2O3 has been measured at temperatures from 600℃ to 1,050℃ and oxygen pressure range of 1 × 10-6 torr to 1 × 102 torr. The defect structure and semiconductor type are investigated by measuring the temperature and oxygen pressure dependences of electrical conductivity. Sintered La2O3 exhibits the electrical conductivities in the range of 1 × 10-9 to 1 × 10-3 ohm-l·cm-1 under the above oxygen pressures. The oxygen pressure dependences on electrical conductivity are characterized by 5.3 at 1,000℃ and 5.7 at 700℃ and more higher values of 9∼14 below 700℃. The increase in n value with decreasing temperature indicates that a simple conduction mechanism does not exist in this material. The conduction carriers are not metal vacancy but oxygen ion at lower pressures. The conduction data indicate a significant ionic conduction at lower temperatures and electronic conduction at higher temperatures.

  Statistics
Cumulative Counts from November, 2022
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.


  Cite this article

[IEEE Style]

K. H. Kim, C. K. Kang, J. H. Lee, J. S. Choi, "Mixed Ionic and Electronic Conductivity of Lanthanum Sesquioxide," Journal of the Korean Chemical Society, vol. 31, no. 4, pp. 301-307, 1987. DOI: .

[ACM Style]

Keu Hong Kim, Chang Kwon Kang, Jong Hwan Lee, and Jae Shi Choi. 1987. Mixed Ionic and Electronic Conductivity of Lanthanum Sesquioxide. Journal of the Korean Chemical Society, 31, 4, (1987), 301-307. DOI: .

Search
(IN TITLE, AUTHOR, ABSTRACT,KEYWORDS)

Advanced Search ▼

POPULAR KEYWORDS
(TOP 10 KEYWORDS)

Recent Publications
(LAST 3 YEARS)

ISSN(Print) 1017-2548
ISSN(Online) 2234-8530