Taeniolite, KLiMg

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Experimental evidence for the effect of starting compositions on the growth of CaWO4 crystals from Na2WO4 flux was given on the basis of the obtained solubility data. Crystal growth was conducted by heating mixtures at 1100°C for 5 h, followed by cooling to 500°C at a rate of 5°C h−1. Octahedral crystals up to 4.5 mm in size were grown. Mixture with ΔTSL(=TSoak temperature−TLiquidus temperature)=340°C produced 226 crystals measuring about 2.2 mm on the average. The crystal sizes decreased gradually and crystal numbers increased remarkably with a decrease in ΔTSL. The crystal sizes were mainly determined by the number of crystals grown. The value of ΔTSL played an important role in controlling the size and number of the crystals grown. It was experimentally confirmed that a greater ΔTSL or lower solute content resulted in larger crystals.