Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Grain Boundary Chemistry and Electrical Characteristics of Semiconducting $SrTiO_3$ Ceramics Synthesized from Surface-Coated Powders

표면 코팅된 분말을 이용하여 제조된 반도성 $SrTiO_3$ 소결체의 입계화학과 전기적 특성

  • 박명범 (인하대학교 무기재료공학과) ;
  • 김정돈 (한국과학기술연구원 세라믹스 연구부) ;
  • 허현 (인하대학교 무기재료공학과) ;
  • 조남희 (인하대학교 무기재료공학과)
  • Published : 1999.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

The defect chemistry and electrical characteristics of the grain boundaries of semiconducting SrTiO3 ceramics synthesized with wet-chemically surface-coated powders were investigated. The starting powders were separated into groups of 1-10${\mu}{\textrm}{m}$ 10-20${\mu}{\textrm}{m}$ etc by sedimentation and sieving methods. Na+ ions were absorbed on the powder surfaces by wet chemical-treatment method. The width of the grain boundary ranged up to several nm and the intergranular materials was amorphous. The additives coated on the surface of the powders were observed to be present at the grain boundaries of the ceramics. The diffusion depth of the additives into grains was about 30nm for the SrTiO3 ceramics synthesized with 5w/o coated materials, The threshold voltage grain boundary resistance and boundary potential barrier of the ceramics increased from 0.67V/cm 2.27k$\Omega$ and 0.05eV to 80.9V/cm 13.0k$\Omega$ 1.44eV with increasing the amount of the additives from 0 to 5 w/o respectively .

Keywords

References

  1. J. Phys. Chem. Solids v.45 no.1015-1031 Ceramic Sensors and Tansducers B.M. Kulwicki
  2. J. Am. Ceram. Soc. v.47 no.484-490 Resistivity Anomaly in Doped Barium Titanate W. Heywang
  3. J. Am. Ceram. Soc. v.73 no.3284-3296 Grain-Boundary Chemistry. II, Orgin of Electrical Barriers in Positive-Temperature-Coefficient Thermistors Y.M. Chiang;T. Takagi
  4. J. Am. Ceram. Soc. v.73 no.3407-3415 Interfacial Segregation in Perovskites : III. Microstructure and Electrical Properties S.B. Desu;D.A. Payne
  5. J. Am. Ceram. Soc. v.64 no.687-690 Microstructure of SrTiO₃Boundary-Layer Capacitor Material P.E.C. Franken;M.P.A. Viegers;A.P. Gehring
  6. 전기전자재료학회지 v.12 no.219-228 반도성 BaTiO₃소결체 입계의 전위 장벽 및 입계저항 특성 강민석;허현;조남희
  7. J. Am. Ceram. Soc. v.68 no.C300-C303 Microstructure and Electrical Properties of Sodium-Diffused and Potassium-Diffused SrTiO₃Barrier-Layer Capacitors Exhibiting Varistors Behavior M. Fujimoto;Y.M. Chiang;A. Roshko;W.D. Kingery
  8. 한국요업학회지 v.34 no.23-30 입계확산에 의한 반도성 SrTiO₃의 세라믹스의 입계구조 및 전기적 특성 변화 김태균;조남희
  9. 한국군사과학기술학회지 v.2 no.170-182 알칼리 금속 이온의 입계확산에 따른 (Sr.Ca)TiO₃소결체의 입계 구조 및 전기적 특성 허현;조남희
  10. Ceram. Eng. Sci. Proc. v.71 no.929-933 Effects of SiC Whisker Tretments on the Performance of SiC Whiskers/Alu-mina Matrix Composites D. Qi;R.T. Coyle
  11. J. Am. Ceram. Soc. v.73 no.394-402 Silicon Carbide Whisker/Alumina Matrix Composites : Effects of Whisker Surface Treatment on Fracture Toughness J. Homey;W. Vaughn
  12. Ceram. Eng. Sci. Proc. v.15 no.951-958 Improved Carbon Coating for Silicon Carbide Whiskers T.J. Mioz;E.Z. Groal;J.P. Bunkner;J.M. Prinzbach
  13. J. Mater. Sci. v.31 no.399-406 Silicon Carbide Whisker Copper-Matrix Composites Fabricated by Hot Pressing Copper Coated Whiskers P. Yih;D.D.L. Chung
  14. J. Am. Ceram. Soc. v.71 no.934-937 Sol-Gel Coating of Powders for Processing Electronic Ceramics F.A. Selmi;V.R.W. Amarakoon
  15. Solid State Ionics v.75 no.123-126 Grain-Boundary Decorated Titanate Ceramics : Preparation and Processing L. Schneider-Stormann;M. Vollmann;R. Waser
  16. J. Am. Ceram. Soc. v.55 no.109-113 Linear Intercept Technique for Measuring Grain Size in Two-Phase Poly-crystalline Ceramics J.C. Wurst;J.A. Nelson
  17. J. Am. Ceram. Soc. v.73 no.3398-3406 Interfacial Segregation in Perovskites II. Experimental Evidence S.B. Desu;D.A. Payne
  18. J. Colloid Interface Sci. v.179 no.488-508 A Surface Structural Approach to Ion Adsorption. The Charge Distribution (CD) Model T. Hiemstia;W.H. Van Riemsdijk
  19. Introduction to the Principles of Ceramic Proceeding J.S. Reed
  20. Appl. Catal v.A127 no.219-232 Dehydration of Sodium Hydroxide and Lithium Hydroxide Dispersed over Calcium Oxide Catalysis for the Oxidative Coupling of Methane G.C. Maiti;M. Baerns
  21. J. Am. Ceram. Soc. v.78 no.3352-3356 Characterization of the Firing Schedule for Positive Temperature Coefficient of Resistance BaTiO₃ B.C. La Course;V.D.W. Amarakoon
  22. J. Am. Ceram. v.69 no.647-651 Grain-Boundary Effect in Ceria Doped with Trivalent Cations : II, Microstructure and Microanaysis R. Gerhardt;A.S. Nowick;M.E. Mochel;I. Dumler
  23. CRC Handbok of Chemistry and Physics 74th Edition v.12-79 D.R. Lide
  24. J. Am. Ceram. Soc. v.50 no.4475-4482 Capacitance-vs-Voltage Characteristics of ZnO Varistor K. Maker;K. Tsuda;I. Nagaswa
  25. Electoceramics. Materials Properties Application A.J. Moulson;J.M. hebert