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Crystal Chemistry and Phase Equilibria of the BaO-R2O3-CuO Systems

Published online by Cambridge University Press:  06 March 2019

Winnie Wong-Ng ,
Boris Paretzkin  and
Edwin R. Fuller Jr.
Winnie Wong-Ng
Affiliation:
Ceramics Division National Institute of Standards and Technology Gaithersburg, Md 20899
Boris Paretzkin
Affiliation:
Ceramics Division National Institute of Standards and Technology Gaithersburg, Md 20899
Edwin R. Fuller Jr.
Affiliation:
Ceramics Division National Institute of Standards and Technology Gaithersburg, Md 20899
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Abstract

Two important factors, the progressively decreasing size of the lanthanides, which is known as the lanthanide contraction, as well as the stability of different oxidation states of these elements influence the prediction of compound formation in the Ba-R-Cu-O systems. A systematic investigation of these lanthanide systems and comparison with the Y system has revealed a correlation of the effect of the above factors, in particular the size factor, on the trend of phase formation, solid solution formation and phase compatibility diagrams of the Ba-R-Cu-O systems. For example, it has been found that the smaller the size of R3+ or the greater the mismatch betwaen Ba2+ and R3+ in the solid solution series Ba2-ZR1+lCu3O6+x, the smaller the extent of solid solution formation. This differing extent of solid solution formation influences the ternary phase relationships.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 33: Thirty-Eighth Annual Conference on Applications of X-ray Analysis, July 31 - August 4, 1989 , 1989 , pp. 453 - 465
Copyright
Copyright © International Centre for Diffraction Data 1989

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