Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Characterization of LaCrO$_3$ Powders Synthesized by Combustion Process with Different Heating Methods

가열방법에 따른 LaCrO$_3$ 연소합성분말의 특성

  • 정층환 (한국원자력연구소 기능성재료) ;
  • 박홍규 (한국원자력연구소 기능성재료) ;
  • 오석진 (한국원자력연구소 기능성재료) ;
  • 박지연 (한국원자력연구소 기능성재료)
  • Published : 1998.10.01
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Abstract

lanthanum chromite(LaCrO3) powder was synthesized by the combustion of a solution of metal nitrates La(NO3).6H2O and Cr(NO3)3.9H2O and urea. The pH of solution affected a yield of the combustion products but did not influence the morphology of the products. When the pH of the solution was in the range of 0.7-4, the yield of the combustion products was more than 90% The morphology of the combustion products was af-fected by heating methods for the solution. The hot-plate induced heating of the solution yielded powders hav-ing two-dimensionally interconnected agglomerates whereas microwave-induced heating produced a fine and non-agglomerated powders. The specific surface area(BET) of the combustion products using microwave-in-non-agglomerated powders. The specific surface area(BET) of the combustion products using microwave-in-duced heating method were larger(25~32m2/g) than that of hot plate heating method(10-14m2/g)

금속 질산염과 urea를 사용하여 연소합성법에 의해 LaCrO3 분말을 제조하고, 용액의 pH를 HNO3와 NH4OH로 조절한 후, 용매의 가열방법에 따른 연소 생성물인 LaCrO3의 형상을 고찰하였다. 연소생성물의 수율은 용액의 pH에 의해 크게 좌우되었다. 용액의 pH가 0.7~4 사이에서는 90% 이상의 수율이 얻어졌으나, 5 이상 또는 0.5 이하의 pH에서는 수율이 크게 감소하였다. 한편, 연소생성물의 형상은 용액의 pH에 무관하였고 용액의 가열방법에 좌우되었다. 용액을 저항가열법으로 가열하여 연소반응시킨 경우의 분말은 미세한 일차입자들이 2차원적으로 연결된 응집체를 형성하고 있었으나, 마이크로파를 인가하여 가열한 경우에는 용액의 pH에 관계없이 미세한 LaCrO3 분말이 얻어졌다. BET 분석 결과, 마이크로파 가열에 의해 얻어진 입자의 비표면적은 25~32m2/g으로 저항가열법으로 가열한 경우의 10-14m2/g에 비해 더 큰 값을 보였다. 이러한 결과는 마이크로파에 의한 연소반응물의 균일한 가열이 연소생성물의 2차원적인 강항 응집체 형성을 억제할 수 있음을 보여 주었다.

Keywords

References

  1. J. Power Sources v.1 Electrode Interconnection Materials, An Important Component in High Temperature Fuel Cells Part Ⅰ: Selection of High Electronic Conductive Double Oxide W. Baugal;W. Kunn;H. Kleinschmager;F.J. Rohr
  2. J. Power Sources v.10 no.1 High Temperature Solid Oxide Fuel Cells-Technical Statue W. Feduska;A.O. Isenberg
  3. Processing of Crystalline Ceramics Fabrication and Property Control of LaCrO₃ Based Oxides H. U. Anderson;H. Paul Mour Ⅲ(ed.);R.F. Daves(ed.);T.M. Hare(ed.)
  4. J. Am. Ceram. Soc. v.59 no.9-10 Densification of $La_{1-x}Sr_xCrO_3$ L. Groupp;H.U. Anderson
  5. J. Mater. Sci. Lett. v.7 Sintering of Lanthanum Chromite Doped with Zinc or Copper S. Hayashi;K. Jukaya;H. Saito
  6. Proceedings of the International Symposium on Solid Oxide Fuel Cells(Nagoya, Japan, November 1989) Interface Reactions and Sintering of Doped LaCrO₃ Materials C. Milliken;S. Elangovan;A. Khandkar;O. Yamamoto(ed.);M. Dokiya(ed.);H. Tagawa(ed.)
  7. J. Am. Ceram. Soc. v.76 no.3 Liquid-Phase-Assisted Sintering of Calcium-Doped Lanthanum Chromites N. Sakai;T. Kawada;H. Yokokawa;M. Dokia;I. Kojima
  8. Combust. Flame v.40 no.71 New Aproach to Thermochemical Calculations of Condensed Fuel-Oxidizer Mixtures S.R. Jain;K.C. Adiga;V.R. Pai Verneker
  9. J. Am. Ceram. Soc. v.75 no.4 Combustion Synthesis of Metal Chromite Powders S.S. Manoharan;K.C. Patil
  10. Mater. Letters. v.10 no.6 Glycine-nitrate Combusition Synthesis of Oxide Ceramic Powders L.A. Chick;L.R. Paderson;G.D. Maupin;J.L. Bates;L.E. Thomas;G.J. Exarhos
  11. Ceram. Eng. & Sci. Proc. v.15 no.5 Synthesis of Nanocryatalline Alumina and Alumina-Zirconia Composites by a Combustion Assisted Process S.B. Bhaduri;R. Radhakrishnan;D. Linch
  12. Mater. Letters v.6 no.427 A Novel Combustion Process for the Synthesis of Fine Particle α-Alumina and Related Oxide Materials J.J. Kingsley;K.C. Patil
  13. Mater. Letters v.10 no.291 A Rapid Combustion Process for the Preparation of Crystalline Mullite Powders R. Gopi Chandran;K.C. Patil
  14. Am. Ceram. Soc. Bull. v.66 no.40 A Low Temperature Path to the Preparation of Ultrafine Ferrites P. Ravidranathan;K.C. Patil
  15. Mater. Letter. v.9/10 no.437 Combustion Synthesis of $YBa_2Cu_3O_{7-x}$:Glycine/Metal Nitrates Method L.R. Pderson;G.D. Maupin;W.J. Weber;D.J. McReady;R.W. Stephens
  16. Mater. Res. Soc. Symp. Proc. v.124 New Frontiers in the Use of Microwave Energy: Powder and Metrology R.W. Bruce
  17. Mater. Res. Soc. Symp. Proc. v.269 Polymethyl Methacrylate Binder Removal from an Alumina Compael: Microwave versus Conventional Heating E.H. Moore;D.E. Clark;R. Hutcheson
  18. Mater. Res. Soc. Symp. Proc. v.124 Microwave Processing of Polymers and Biomass Materials C.E. George;G.R. Lightsey;A.G. Wehr
  19. Am. Ceram. Soc. Bull. v.68 no.2 Microwave Processing of Ceramics Materials W.H. Sutton
  20. J. Mater. Sci. Lett. v.6 Microwave Sintering of Some Oxide Materials Using Sintering Aids T.T. Meek;C.E. Holeombe;N. Dykes