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CaO에 의하여 부분 안정화된 $ZrO_2$의 고온 전기 전도도에 대한 연구
Investigation of High Temperature Electrical Conductivity of CaO-partially Stabilized $ZrO_2$

변수일   (한국과학원 재료공학과UU0001375  );
  • 초록

    The present work was undertaken: (1) to determine if CaO-partially stabilized $ZrO_2$ prepared by Hot Petroleum Drying Method would show better ionic conductor as an oxygen sensor in molten metals than that prepared by Oxide Wet Mixing Method and than CaO-fully stabilized $ZrO_2$ , and (2) to understand the nature of conduction mechanism of CaO-partially stabilized $ZrO_2$ by a comparison of measured electrical conductivity data with theory on defect structure of pure monoclinic $ZrO_2$ and fully stabilized cubic $ZrO_2$ . The DC electrical conductivity was measured by 3-probe technique and the AC electrical conductivity by 2-probe technique as a function of temperature in the range 973-1373 K and oxygen partial pressure in the range 10-1-10-25Mpa. The results of the experiments were as follows: 1. CaO-partially stabilized $ZrO_2$ prepared by Hot petroleum Drying Method showed at T=1094-1285 K and $Po_2$ =10-7- 10-7-10-25 MPa a nearly ionic conduction with 4 times higher conductivity than that prepared by Oxide Wet Mixing Method. 2. High-oxygen pressure conductivity tends toward a Po_2^{+1/5}-Po_2^{+1/6}$ dependence. An analysis of possible defect structures suggests that CaO-partially stabilized $ZrO_2$ has an anti-Frenkel defect in which singly or doubly ionized oxygen interstitials and defect electrons predominate at T=1094-1285 K and $Po_2$ =10-1- 10-1-10-7MPa. 3. The activation energy for pure electron hole-conduction and ionic conduction of CaO-partially stabilized $ZrO_2$ was found to be 130 KJ/mol at T=973-1373 K, $Po_2$ =2, 12 2, 127 10-2 MPa(air) and 153KJ/mol at T=1094-1285 K respectively.


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 저자의 다른 논문

  • 변수일 (8)

    1. 1976 "안정된 $ZrO^2$의 소결에 대하여" 요업학회지 = Journal of the Korean Ceramic Society 13 (4): 44~49    
    2. 1977 "다성분계 산화물의 요업재료 제조를 위한 석유 증발 건조 방법" 요업학회지 = Journal of the Korean Ceramic Society 14 (3): 163~168    
    3. 1979 "Mn-Zn Ferrite의 소결조건이 미세조직 및 자기특성에 미치는 영향" 요업학회지 = Journal of the Korean Ceramic Society 16 (1): 3~12    
    4. 1979 "국산 명반석과 황산염으로부터 고순도의 미세한 알루미나의 제조 및 특성에 관한 연구" 요업학회지 = Journal of the Korean Ceramic Society 16 (1): 13~20    
    5. 1979 "석유증발 건조방법에 의한 Mn-Zn Ferrite의 제조에 관한 연구" 요업학회지 = Journal of the Korean Ceramic Society 16 (2): 69~76    
    6. 1979 "미세조직 및 첨가성분 (CoO와 $Al_2O_3$)이 Mn-Zn Ferrite의 자기적 성질에 미치는 영향" 요업학회지 = Journal of the Korean Ceramic Society 16 (3): 142~154    
    7. 1979 "습식화학 방법에 의한 안정화된 $ZrO_2$의 제조 및 특성에 대한 연구" 요업학회지 = Journal of the Korean Ceramic Society 16 (3): 155~163    
    8. 1980 "연강에서의 닉켈-주석과 주석-아연합금 전착층의 우성배향와 미소경도에 관한 연구" 금속표면처리 = Journal of the metal finishing society of Korea 13 (3): 146~154    

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