Excerpt from Melting Points of Some Refractory Oxides
The melting points of some refractory oxides have been deter mined ih a graphite resistance vacuum furnace. The tempera tures were measured by an optical pyrometer and heating curves were plotted. The production of smoke w... hen some of the oxides were heated was found to be an important source of error, as the smoke interferes with the use of the pyrometer. Means by which this difficulty was overcome are described. The following melt mg points were obtained, the melting point of platinum being determined merely as a check.
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