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Oxygen‐Ion Diffusion in a 110 K Phase BiPbSrCaCuO Superconductor
Author(s) -
Zhu Wen,
Kuo Chu Kun,
Nicholson Patrick S.
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.tb01972.x
Subject(s) - oxygen , analytical chemistry (journal) , diffusion , phase (matter) , materials science , ion , conductivity , thermal diffusivity , grain boundary , superconductivity , chemistry , thermodynamics , microstructure , condensed matter physics , metallurgy , physics , organic chemistry , chromatography
The oxygen‐ion conductivity of a hot‐pressed 110 K phase (2223) superconductor was determined by using an O 2 ,Pt/ZrO 2 /110 K phase/ZrO 2 /Pt,O 2 cell and impedance spectroscopy at temperature of 600°‐800°C and oxygen partial pressures ( P O2 ) of 0.21‐0.001 atm (∼21‐0.1 kPa). The oxygen‐ion diffusivities were calculated via the Nerst‐Einstein equation and were greater in air than at P O2 = 0.001 atm. Decomposition of the 110 K phase at 800°C and P O2 = 0.001 atm increased the bulk diffusivity but had a lesser effect on the grain‐boundary diffusivities. The activation energies for oxygen diffusion, at different P O2 values, have been determined.