Analysis of Oxygen-18 in Solid Oxides by Spark Source Mass Spectrometry

Abstract

The spark source mass spectrometry was applied to the analysis of 18O in solid oxides. After some trials such method was adopted successfully that a solid specimen was wound around by gold wire and a pointed gold wire was set as a counter-electrode. After the ion source chamber was evacuated, the specimen was heated for 30 minutes by the use of the heater set in the chamber in order to remove the adsorbed water. As a result of this treatment the influence of the water was erased. The quantitative analysis was performed by comparing the density of the spectrum of 18O+ with that of 16O+. The crater sizes were measured by the microscopy and the depth of sampling was estimated at the order of 5μ. The method stated in this note will be applied validly to determine the 18O distribution in the diffusion couple or the product layer formed by solid state reaction. 2 figs., 3 tables, 2 refs.