Quaternary system SrO-CaO-BaO-CuO at 950 C. 2: Phase equilibria related to the substitution Sr/Ba in (Sr/Ba){sub 2}Ca{sub 2}Cu{sub 2}Cu{sub 3}O{sub 7} and (Sr/Ba){sub 2}CaCu{sub 2}O{sub 5} samples

Journal Article · Fri Aug 01 00:00:00 EDT 1997 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(97)00076-7· OSTI ID:522371

Lebbou, K; Abraham, R; Trosset, S; Cohen-Adad, M T ^[1]

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1. Univ. Claude Bernard-Lyon I, Villeurbanne (France)

A partial study of the solid-solid equilibria in the quaternary system BaO-SrO-CaO-CuO has been undertaken in order to determine the observed phases and their evolution when Ba is substituted for Sr in mixtures (Sr/Ba){sub 2}CaCu{sub 2}O{sub x} and (Sr/Ba){sub 2}Ca{sub 2}Cu{sub 3}O{sub x}. The temperature was fixed at 950 C and samples were elaborated under 1 bar of flowing oxygen. It has been shown that two four-phased domains exist in this quaternary system, including the following phases: ({und Ba}/Sr/Ca)CuO{sub 2}, ({und Sr/Ca}/Ba){sub 2}CuO{sub 3}, ({und Sr/Ca}/Ba){sub 14}Cu{sub 24}O{sub x}, and Ba{sub 4}CaCu{sub 3}O{sub 8} substituted Sr/Ca for the one and ({und Ba}/Sr/Ca)CuO{sub 2}, ({und Sr/Ca}/Ba){sub 2}CuO{sub 3}, ({und Sr/Ca}/Ba){sub 14}Cu{sub 24}O{sub x}, and ({und Sr/Ca}/Ba/)CuO{sub 2} for the other.

• OSTI ID: 522371
• Journal Information: Materials Research Bulletin, Vol. 32, Issue 8; Other Information: PBD: Aug 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PHASE STUDIES
STRONTIUM OXIDES
CALCIUM OXIDES
BARIUM OXIDES
COPPER OXIDES
TEMPERATURE RANGE 1000-4000 K
EQUILIBRIUM
OXYGEN
DOMAIN STRUCTURE
CHEMICAL COMPOSITION