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'Activation Energy' in keywords Facet   Publication Year 1988  [X]
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1Author    ChrL. Teske, Hk Müller-BuschbaumRequires cookie*
 Abstract    h e rm o a n a ly tis c h e U n te rs u c h u n g e n z u r R ü c k o x id a tio n von B a 2Y C u 30 6 + :c Thermoanalytical Investigations about the Reoxidation of Ba2YCu3Ob + x The reoxidation reaction of Ba,YCu30 6+x forming the superconducting ceramic material Ba2YCu30 6 93 is studied by thermoanalytical methods (DTA and TG). The exothermal oxygen uptake in pure 0 2-atmosphere is at a maximum rate in the range of 230-330 C (% 150 min). The reoxidation temperature can be lowered by treatment of Ba2YCu3Oe 0 in Ar: H2 = 1:1 atmosphere but the uptake of greater amounts of hydrogen prevents the material from becoming super-conducting again at low reoxidation temperatures. The process has an activation energy Ea = 70.9 + 2kJ/Mol and a reaction enthalpy AH = — 86.7kJ/Mol Ba2YCu30 6 0 (normalized to a 1/2 0 2 basis) which is estimated from DTA-data. 
  Reference    Z. Naturforsch. 43a, 965—970 (1988); eingegangen am 8. August 1988 
  Published    1988 
  Keywords    Ba2YCu30 6 + x, Thermoanalysis, Reoxidation, Activation Energy, Reaction Enthalpy 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0965.pdf 
 Identifier    ZNA-1988-43a-0965 
 Volume    43