Abstract
The charge compensation of trivalent rare earths in the divalent Ca site of calcium tungstate was studied by the determination of distribution coefficients. The behavior of neodymium was investigated in the presence of all the alkali metal ions and niobium, and all the other rare earths in the presence of sodium.The distribution coefficient of Nd is found to vary with the concentration of Nd itself, as well as with the concentration of charge compensating ions present. Several separate mechanisms including vacancy formation are inferred, and are confirmed by paramagnetic resonance results.In the next paper a theory covering this data is presented. Columnar growth has been observed and can be caused by either CaO or WO3 excess in the melt.
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