Diffusivity and solubility of oxygen in platinum and Pt-Ni alloys |
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| Authors: | L R Velho R W Bartlett |
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| Affiliation: | (1) Department of Metallurgy, P. U. C, Catholic University of Rio de Janeiro, Brazil;(2) Department of Mineral Engineering, Stanford University, USA |
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| Abstract: | The diffusivity and solubility of oxygen in metal specimens were determined from measurements of permeation through thin wall
tubes containing oxygen and heated by electrical resistance. The permeating oxygen desorbed in vacuum as monoatomic oxygen
and the flux was monitored mass-spectrometrically. A known helium leak rate and experimentally-determined sensitivities of
the two gases were used for flow calibration. The diffusion coefficient of oxygen in pure platinum, calculated from the time
lag to reach a steady state flux, is: {fx065-01} in the temperature range of 1435∮ to 1504°. The solubility of oxygen in pure
platinum was obtained from the steady-state flux using the previously determined diffusivity. The solubility is proportional
to p1/2O2 and at 1 atm of oxygen the solubility is: Cs
O = (0.2 ± 0.1) × 1012 exp {fx065-02}, wt pct. Small amounts of nickel, less than required for internal oxidation, had a negligible effect on the
oxygen solubility and diffusivity in platinum alloys.
Formerly Graduate Student, Department of Mineral Engineering, Stanford University, Stanford, Calif.
This paper is based upon a thesis submitted by L. R. VELHO in partial fulfillment of the requirements of the degree of Doctor
of Philosophy at Stanford University. |
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