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Thermal Decompositions of (RE)Ba2Cu3O6 (RE=Y, Nd, Er)

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Abstract

Thermogravimetric in situ measurements of oxygen loss from (RE)Ba2Cu3O6 samples (RE=Y, Nd, Er) heated isothermally in a relatively high dynamic vacuum were made with a Cahn RG electrobalance. Single-phase orthorhombic samples of composition (RE)Ba2Cu3O7-x (highest oxygen content) were synthesized from stoichiometric (1:2:3) mixtures of high-purity (RE)2O3, BaCO3 and CuO. The original 1:2:3 mixture was prepared by the two-stage procedure described earlier. The crystal structure of the sample in the original orthorhombic phase was controlled by the X-ray powder method (CuKα radiation) using a Stadi P Stoe diffractometer with a position-sensitive detector. The decomposition curves are described by the sum of exponential terms corresponding to rapid and slow first-order processes in which differently sized grains of the powder samples are involved. The activation energies are estimated from appropriate Arrhenius plots.

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Authors and Affiliations

  1. W. Trzebiatowski Institute of Low-Temperature and Structure Research, Polish Academy of Sciences, 50-950, Wrocław 2, P.O. Box 937, Poland

    G. W. Chądzyński, J. Stępień-Damm & Z. Damm

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  1. G. W. Chądzyński
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Chądzyński, G.W., Stępień-Damm, J. & Damm, Z. Thermal Decompositions of (RE)Ba2Cu3O6 (RE=Y, Nd, Er). Journal of Thermal Analysis and Calorimetry 55, 691–698 (1999). https://doi.org/10.1023/A:1010182927688

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