The decomposition of the oxalate precursor and the stability and reduction of the YBa2Cu4O8 superconductor studied by TG coupled with FTIR and by XRD
作者： J. Mullens , A. Vos , A. De Backer , D. Franco , J. Yperman
DOI: 10.1007/BF02546580
关键词: Decomposition 、 Pyrolysis 、 One-Step 、 X-ray crystallography 、 Oxalate 、 Inorganic chemistry 、 Kinetics 、 Weight change 、 Chemistry 、 Fourier transform infrared spectroscopy
摘要: The 124 superconductor YBa2Cu4O8 was prepared from the oxalate precursor Y2(C2O4)3. ·4BaC2O4·8CuC2O4·xH2O at one atmosphere oxygen pressure. In O2 decomposes in step 300°C and more gradually (300°–600°C) Ar. stability of is strongly dependent on gas atmosphere: air there no significant weight change as long temperature does not exceed 800°C, whereas a 1% O2-99%N2 mixture decomposition starts about 670°C with formation CuO YBa2Cu3Ox withx<7. reduction 5% H2-95% Ar takes place least four major steps products such Y2O3, BaO, Cu2O, Cu, BaY2O4 Ba4Y2O7.
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