Reaction Characterization of Y2Ba1CU1O5 Oxides by Solid State Reaction Method and Pyrophoric Synthesis Method

고상반응법과 발화합성법에 의한 Y2Ba1CU1O5 산화물의 반응특성

  • 박정식 (한려대학교 석유화학공학과)
  • Received : 1999.05.20
  • Accepted : 1999.07.24
  • Published : 1999.08.10

Abstract

$Y_2Ba_1Cu_1O_5(Y211)$ powders were prepared by pyrophoric synthesis method and by solid state reaction method using $Y_2O_3(99.9%)$, $BaCO_3(99.9%)$, and CuO(99.9%) powders in both of these processes. The phase formation and reaction kinetics of $Y_2Ba_1Cu_1O_5$ powders have been studied using X-ray diffraction analysis(XRD) of samples at various heat treatment temperatures and reaction time. The reaction characterization suggested that the phase formation rate is mainly controlled by the particle size of Y211 powders. The activation energy(${\Delta}E_a$) of Y211 phase formation in this pyrophoric synthesis method was found to be 136.42 kJ/mol compared with 149.46 kJ/mol for that of solid state reaction method. These results data showed that the pyrophoric synthesis method is kineticaly more efficient than the solid state reaction method in this $Y_2Ba_1Cu_1O_5$ system.

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