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THE CONDENSATION COEFFICIENT OF NIO.
Rept. for 1 Feb 67-31 Jan 68,
CINCINNATI UNIV OHIO
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The condensation coefficient of oxygen in NiO was studied using the isotope exchange technique applied earlier for aluminum nitride and boron nitride. Experiments were carried out in a platinum Knudsen cell and in an aluminum oxide Knudsen cell. Using the aluminum oxide Knudsen cell, the condensation coefficient beta for NiO was found to be 0.11 in the temperature range 1700-1750K. Using the platinum Knudsen cell, the exchange coefficient reached an equilibrium value of 0.5 because oxygen exchange also took place on the hot platinum surface. It was found also that NiO exchanges with oxygen in the air very slowly at room temperature. Author
APPROVED FOR PUBLIC RELEASE