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Effect of High‐Temperature, High‐Oxygen‐Fugacity Annealing on the Stability of the (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10 ±δ ‐type Compound
Author(s) -
Allemeh Seyed M.,
Sandhage Kenneth H.
Publication year - 1995
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.1151-2916.1995.tb08693.x
Subject(s) - fugacity , mineral redox buffer , oxygen , strontium , analytical chemistry (journal) , decomposition , chemistry , annealing (glass) , mineralogy , nuclear chemistry , inorganic chemistry , materials science , metallurgy , organic chemistry , chromatography
The stability of the (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10±δ ‐type compound has been evaluated under conditions of elevated temperature (500°‐860°C) and elevated oxygen fugacity (i.e., in O 2 /Ar gas mixtures containing ≤120% O 2 , at total pressures of 5207 MPa). At sufficiently high oxygen fugacities and temperatures, the (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10±δ ‐type compound transformed into a mixture of a strontium‐rich (Bi,Pb) 1 ‐(Sr,Ca,Cu) 2 O y ‐type compound, a calcium‐rich (Bi,Pb) 2 ‐(Sr,Ca,Cu) 2 O y ‐type compound, CuO, and a small amount of (Sr,Ca)O. The decomposition of the (Bi,Pb) 2 Sr 2 Ca 2 ‐Cu 3 O 10±δ ‐type compound was accompanied by a 2%‐3% weight gain, which was consistent with an oxidation reaction. The conditions of oxygen fugacity and temperature leading to decomposition, and the resulting decomposition products, are compared for the (Bi,Pb) 2 Sr 2 Ca 2 Cu 2 O 10±δ ‐type and Bi 2 Sr 2 Ca 1 Cu 2 O 8±Ψ ‐type compounds.