한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제31권6호
  • /
  • Pages.587-594
  • /
  • 1994
  • /
  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지

$(Ba, Sr)TiO_3$계 PTCR 세라믹스의 입계산화에 대한 $\mu-AES$ 분석 및 $DV-X\alpha$ 궤도에너지 계산모사

Analysis of Grain Boundary Oxidation in $(Ba, Sr)TiO_3$-based PTCR Ceramics by $\mu-AES$ and $DV-X\alpha$ Energy Simulation

  • 김명철 (군산대학교 공과대학 재료공학과) ;
  • 강영석 (서울대학교 공과대학 무기재료공학과) ;
  • 허수형 (서울대학교 공과대학 무기재료공학과) ;
  • 박순자 (서울대학교 공과대학 무기재료공학과)
  • 발행 : 1994.06.01
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초록

(Ba, Sr)TiO3-based PTCR ceramics were sintered and cooled down with various cooling conditions in the air. AES was applied to investigate the composition change in the grain boundary and bulk area of oxidatively cooled samples. Ba component was deficit in grain boundary region, while oxygen was abundant than bulk region. The discrete changes of oxygen binding energies were confirmed in the grain boundary region of the heavily oxidized samples. It was supposed that the large binding energy shift resulted from the oxidation of the segregated Mn in grain boundary region and this idea was supported by the DV-X$\alpha$ molecular energy simulation.

키워드

참고문헌

  1. Solid-State Electronics v.3 no.1 Barium Titanate as Semiconductor with Blocking Layers W. Heywang
  2. Mat Res Bull. v.2 no.4 Some Aspects of Semiconducting Barium Titanate G.H. Jonker
  3. Advances in Ceramics v.1 PTC materials Technology, 1955-1980 B. Kulwicki;L. M. Levinson(ed.)
  4. Surface Analysis by AES/SAM S. H. Han
  5. DV-Xα Molrcular Orbital Method -Introduction to Quantum Materials Chemistry-Approach from DV-Xα method H. Adachi;H. Adachi(ed.)
  6. J of Phys Soc. Jpn. v.45 no.3 Discrete Variational Xα Calculations.Ⅰ-Ⅳ H. Adachi;M. Tsukada;C. Satoko
  7. J of Phys Soc. Jpn. v.45 no.4 Discrete Variational Xα Calculations.Ⅰ-Ⅳ H. Adachi;M. Tsukada;C. Satoko
  8. J of Phys Soc. Jpn. v.47 no.5 Discrete Variational Xα Calculations.Ⅰ-Ⅳ H. Adachi;M. Tsukada;C. Satoko
  9. J of Phys Soc. Jpn. v.49 no.5 Discrete Variational Xα Calculations.Ⅰ-Ⅳ H. Adachi;M. Tsukada;C. Satoko
  10. J Am. Ceram. Soc. v.73 no.11 Cluster Models for Electronic Structure of Oxide Ceramics D.E. Ellis;J. Guo;D. Lam
  11. J. Am. Ceram. Soc. v.73 no.11 Theoretical Studies of the Electronic Properties of Ceramic Materials W.Y. Ching
  12. Symmetry in Molecules and Crystals Elements of Group Theory M.F.C. Ladd
  13. News of Osaka University Computer Center v.19 no.2 User manual of DV-Xα Cluster Molecular Orbital Simulation Program H. Adachi
  14. J. Am. Ceram. Soc v.73 no.11 Grain-Boundary Chemistry of Barium Titanate and Strontium Titanate Y.M Chiang;T. Takagi
  15. J. Am. Ceram. Soc v.73 no.11 Interfacial Segregation in Perovskites: I. Theory, II. Experimental Evidence, III. Micristructure and Electrical Properties, IV. Internal Boundary Layer Devices S.B. Desu;D.A. Payne
  16. J Am. Ceram. Soc v.75 no.7 Comment on 'interfacial Segregation in Perovskites: I-IV' Y.M. Chiang;T. Takagi
  17. J. Am. Ceram. Soc. v.75 no.7 Reply to "Comment on 'Interfacial Segregation in Perovskites: I-IV' S.B. Desu;D.A. Payne
  18. Philips Res. Repts v.31 New Aspects of an Improved PTC Model J Daniels;R. Wernicke
  19. J. Appl. Phys. v.67 no.4 The Influence of Mn on the Grain-Boundary Potential Barrier Characteristics of Doner-Doped Ba-TiO₃Ceramics J. Illingsworth;H.A. Al-Allak;A.W. Brinkman;J. Woods