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Thermodynamic Correlation of Oxygen Coverage on Refracting Metals at High Temperature and Low Pressure

The oxygen coverage on retracting metals at high solid temperatures and low oxygen pressures has been correlated on the basis of thermodynamic relations. Experimental oxygen coverage data on polycrystalline tungsten and rhenium surfaces at high temperatures (1400\leqslantT\leqslant2500 K) and low pressures (10-9\leqslantPO2 \leqslant10-5 Torr) have been used to test the correlation and the results seem to be satisfactory. It has been shown that T/TR* (where T is the sample temperature and TR* is the saturation temperature corresponding to the oxygen pressure) plots also serve as a good correlation technique and the final result shows that thermodynamic correlation is a better technique for correlating the oxygen coverage data.