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Oxidation/Reduction Melting Equilibria in the System BaO-½Y2O3-CuOx II. Powder X-Ray Analysis

Published online by Cambridge University Press:  06 March 2019

Winnie Wong-Ng  and
Lawrence P. Cook
Winnie Wong-Ng
Affiliation:
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
Lawrence P. Cook
Affiliation:
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

X-ray powder diffraction together with several other analytical techniques have been used to characterize the phase formation and the melt compositions associated with the invariant reactions in the system BaO-½Y2O3-CuOx. In this report, the characterization results of the ternary eutectic reaction of the system, the melting of the high Tc compound Ba2YCU3O6+x, and the melting of the 'green phase' BaY2CuO5 are described. The minimum malting eutectic temperature of the system has been determined to be ≈ 925°C, which corresponds to the reaction of Ba2YCu3O6+x + CuO + BaCuO2 → Liquid. The melting of Ba2YCu3O6+x takes place at around 1015°C to yield BaY2CuO5 + Liquid. The green phase melts around 1270°C to yield BaY2O4, Y2O3 and liquid. All these melts were found to contain only a small amount of Y. Reduction of the copper was found to accompany melting.

Type
IX. XRD Applications: Detection Levitts, Superconductors, Organics, Minerals
Information
Advances in X-Ray Analysis , Volume 35 , Issue A: First Pacific-International Congress on X-ray Analytical Methods (PICXAM). Fortieth Annual Conference on Applications of X-ray Analysis, August 7-16, 1991 , 1991 , pp. 633 - 639
Copyright
Copyright © International Centre for Diffraction Data 1991

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