Abstract
Crystallization kinetics of barium tungstate from unstirred saturated solutions in sodium tungstate melts were studied by continuous cooling from initial crystallization temperature T 0 = 1000 to 800° C to room temperature at cooling rates R T = 0.67 to 3.37° C min -1. The crystallization kinetics and growth mechanism are identical to those of calcium and strontium tungstate. The main crystal growth was diffusion-rate-controlled; the final crystal growth was rate-controlled by the development rate of excess solute concentration. The estimated diffusion rate constant ( k D values increased with cooling rates and initial crystallization temperatures. They are higher than the rate constants for diffusion-controlled growth of calcium tungstate from sodium tungstate melts but smaller than those for strontium tungstate from the same melt, and also for strontium and barium tungstate from lithium chloride melts.
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