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Hypothesis on a High‐Temperature, Solid‐state Galvanic Cell Composed of Refractory Metal Electrodes and a Calcia‐Stabilized Zirconia Electrolyte
Author(s) -
Buyers A. G.
Publication year - 1965
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.1151-2916.1965.tb16045.x
Subject(s) - cubic zirconia , tantalum , materials science , electrolyte , galvanic cell , inorganic chemistry , ionic conductivity , oxide , fast ion conductor , chemical engineering , metallurgy , ceramic , chemistry , electrode , engineering
Application of heat to a tantalum‐calcia stabilized zirconia‐tungsten cell, in which the tantalum‐zirconia interface has been bonded previously, produced emf's in the range 673° to 2273°K. The origin of these potentials was proposed tentatively to be solid‐state chemical reactions involving the oxidation of tantalum metal and the reduction of ferric ion present as an impurity oxide in the stabilized zirconia. Thermal gradients in the zirconia produced opposing Seebeck potentials at temperatures higher than 1073°K. Resistivity measurements performed with solid zirconia electrolytes resulted in the hypothesis that electric conduction in these materials was electronic in stabilized zirconia impregnated with tantalum species and ionic in stabilized zirconia which had undergone no tantalum reaction.