Equilibrium oxygen potential for the decomposition of YBa2Cu4O8

Mathews, Tom ; Jacob, K. T. (1990) Equilibrium oxygen potential for the decomposition of YBa2Cu4O8 Applied Physics Letters, 57 (5). pp. 511-513. ISSN 0003-6951

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Official URL: http://link.aip.org/link/?APPLAB/57/511/1

Related URL: http://dx.doi.org/10.1063/1.103635


On lowering the chemical potential of diatomic oxygen, the compound YBa2Cu4O8 was found to decompose into a mixture of YBa2Cu3O6+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 × 105 Pa as the reference electrode: Pt,O'2||YBa2Cu4O8+YBa2Cu3O6+x+CuO||(Y2O3) ZrO2||O2(1.01×105Pa),Pt. The low oxygen potential boundary for the stability of YBa2Cu4O8 can be represented by ΔμO2=-238 900+207.7 T(±800) J mol-1. At the standard pressure of oxygen (1.01 × 105 Pa) the decomposition occurs at 1150 K.

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