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Equilibrium oxygen potential for the decomposition of $YBa_2Cu_4O_8$

Mathews, Tom and Jacob, KT (1990) Equilibrium oxygen potential for the decomposition of $YBa_2Cu_4O_8$. In: Applied Physics Letters, 57 (5). pp. 511-513.

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Abstract

On lowering the chemical potential of diatomic oxygen, the compound $YBa_2Cu_4O_8$ was found to decompose into a mixture of $YBa_2Cu_3O_{6+x}$ 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 $1.01\times10^5$ Pa as the reference electrode: $Pt, O^\prime_2 \mid YBa_2Cu_4O_{8+}YBa_2Cu_3O{6+x}+CuO \parallel (Y_2O_3) ZrO_2\parallel O_2(1.01\times10^5 Pa), Pt.$ The low oxygen potential boundary for the stability of $YBa_2Cu_4O_8$ can be represented by $\Delta\mu O_2=-238 \hspace{3mm} 900+207.7 T(\pm800) J mol^{-1}$. At the standard pressure of oxygen $(1.01\times10^5 Pa)$ the decomposition occurs at 1150 K.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to The American Institute of Physics.
Keywords: Equilibrium oxygen;chemical potential;compound YBa2Cu4O8;stabilized zirconia
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Srinivasa Naika
Date Deposited: 05 Dec 2007
Last Modified: 19 Sep 2010 04:41
URI: http://eprints.iisc.ac.in/id/eprint/12735

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