Preparing refractory oxides, silicates, and ceramic materials for analysis, by heating with acids in sealed tubes at elevated temperatures

Abstract

This paper describes t he preparation for analysis of a number of refrac tory oxides, ceramic materials, and m inera ls by decomposit ion wit h hydrochloric or bydriodic a.cid at t emperatures up to 300 0 C. All the oxides of the elements in the second, t hird, and fourth groups of the periodic syst em , with t he exception of silica, t itania, zirconia, a nd possibly hafnia, respond to the t reat ment. A number of silicate minerals, ordin arily difficult to prepa re for a nal ysis, are likewise successfully decomposed .