Abstract
The formation of solid phases in the Ln-Ba-Cu-O system (Ln=lanthanide) and their stability have been investigated. At temperatures above 1173 K, mainly four quaternary oxides exist in air. LnBa 2 Cu 3 O 7-x (Ln123), Ln 2 BaCuO 5 (Ln211), LnBa 6 Cu 3 O x (Ln163) and LnBa 4 Cu 3 O x (Ln143). A systematic study clarified that there is a size limit for the Ln 3+ to form quaternary oxides, beyond which the phase stability decreases or changes to another crystal structure. The 123 phase in the Yb system was found to be not stable at low temperatures under a high oxygen partial pressure. The solid solution of quaternary oxides is formed when the radius of Ln 3+ ion is large
Published Version
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