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Preparation of Orthorhombic Ba 2 YCu 3 O 7 Powder by Single‐Step Calcining
Author(s) -
Spann Joseph R.,
Lloyd Isabel K.,
Kahn Manfred,
Chase Mark T.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06531.x
Subject(s) - calcination , orthorhombic crystal system , materials science , decomposition , chemical engineering , powder diffraction , carbonate , phase (matter) , mineralogy , crystallography , chemistry , metallurgy , crystal structure , catalysis , organic chemistry , engineering
A single calcination step, solid‐state process that provides orthohombic Ba 2 YCu 3 O 7 powder is described. BaCO 3 , Y 2 O 3 , and CuO are used as precursor materials. The only phase identifiable by X‐ray diffraction is the orthorhombic Ba 2 YCu 3 O 7 . The use of a vacuum during the inital stages of the calcining process promotes complete decomposition of the carbonate, and no residual carbonate is observed. An oxygen atmosphere during the later stages of calcining ensures proper oxidation to Ba 2 YCu 3 O 7 . The use of a similar combination vacuum‐oxygen calcining schedule should also be beneficial in the preparation of chemically derived powders.