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Phase Diagram of the BaO(BaCO 3 )‐CaO‐CuO System
Author(s) -
Kusano Yoshihiro,
Kikuchi Takeyuki,
Takada Jun,
Fukuhara Minoru,
Ikeda Yasunori,
Hiroi Zenji
Publication year - 1999
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.1151-2916.1999.tb01916.x
Subject(s) - solid solution , phase diagram , solubility , barium , lattice (music) , crystallography , perovskite (structure) , analytical chemistry (journal) , lattice constant , materials science , mineralogy , phase (matter) , chemistry , inorganic chemistry , diffraction , physics , metallurgy , organic chemistry , chromatography , acoustics , optics
The phase diagram of the BaO(BaCO 3 )‐CaO‐CuO system, especially in the barium‐rich region at 900°C in air, was studied. Two new different oxycarbonates were observed: Ba 8 Ca 16/15 Cu 64/15 O 11.20 (CO 3 ) 2.66 and a solid‐solution series with a chemical composition of Ba 2 Ca x + y Cu 1+( x /2)‐ y O 2+delta (CO 3 ) 1‐ z (where 0 ≤ to x ≤ to 2/39 and 0 ≤ to y ≤ to 16 x /5). The oxycarbonate solid solution was formed in a region of the compositional triangle Ba:Ca:Cu (in moles) = (2:0:1)‐(39:1:20)‐(65:7:28). The solid‐solution structure had P 4/ mmm symmetry, with lattice parameters a similar/congruent a p and c similar/congruent 2 a p , where a p represents the perovskite cell. The Ba 8 Ca 16/15 Cu 64/15 O 11.20 (CO 3 ) 2.66 compound, which had Pm 3 m symmetry with a lattice parameter a = 0.8116(2) nm, had no chemical‐solubility range.