Equilibrium oxygen potential for the decomposition of YBa sub 2 Cu sub 4 O sub 8

Journal Article · Mon Jul 30 04:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.103635· OSTI ID:6826355

Mathews, T; Jacob, K T ^[1]

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1. Department of Metallurgy, Indian Institute of Science, Bangalore 560 012 (India)

On lowering the chemical potential of diatomic oxygen, the compound YBa{sub 2}Cu{sub 4}O{sub 8} was found to decompose into a mixture of YBa{sub 2}Cu{sub 3}O{sub 6+{ital x}} and CuO. The equilibrium oxygen potential corresponding to this decomposition has been measured from 870 to 1150 K using a solid-state cell incorporating yttria-stabilized zirconia as the solid electrolyte and pure oxygen at a pressure of 1.01{times}10{sup 5} Pa as the reference electrode: Pt, O{sup {prime}}{sub 2} {vert bar} YBa{sub 2} Cu{sub 4}O{sub 8} + YBa{sub 2} Cu{sub 3} O{sub 6+{ital x}} + CuO {parallel} (Y{sub 2}O{sub 3}) ZrO{sub 2} {parallel} O{sub 2}(1.01 {times} 10{sup 5} Pa), Pt. The low oxygen potential boundary for the stability of YBa{sub 2}Cu{sub 4}O{sub 8} can be represented by {Delta}{mu}O{sub 2} = {minus}238 900 + 207.7 T({plus minus}800) J mol{sup {minus}1}. At the standard pressure of oxygen (1.01 {times} 10{sup 5} Pa) the decomposition occurs at 1150 K.

• OSTI ID: 6826355
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:5; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
DECOMPOSITION
HIGH-TC SUPERCONDUCTORS
KINETICS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION KINETICS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES