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Measurements of the solubilities of niobium and tantalum pentachlorides in liquid titanium tetrachloride have been reported on several occasions.1-4 In one case1 the solubility of the tantalum compound was said to vary between 26 and 60 times that of the niobium compound in the range 25-100'. Such a marked difference in properties between these elements is unexpected. Subsequent reported work indicated that the solubilities of the chlorides were of the same order but there was no general agreement on values; one author4 found the solubilities to be almost identical, another3 found that the tantalum chloride was more soluble, while the third2 found that the niobium chloride was slightly more soluble. Primarily, all values were determined by analyses of the saturated solutions at specific temperatures, hut in two caseslJ were supported by heating and cooling methods. Tarasenkov and Komandinl had no direct method for the analysis of tantalum-titanium mixtures, while Ehrlich and Dietz4 were unable to analyse directly for niobium in the presence of titanium. Indirect methods based on the total chloride content of the solutions were used. Only Ehrlich and Dietz4 described a means of sampling in which a filter was used to separate the saturated solution from undissolved solute. This note reports the results of the redetermination of the solubilities of these compounds in titanium tetrachloride.

The solubilities of niobium and tantalum pentachlorides in titanium tetrachloride