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The surface tension driven convection, together with the rotating crystal growth process of potassium tantalate niobate (KTa1‐xNbxO3, KTN) crystals from unstirred melt has been carried out in a high temperature in‐situ observation system. The streamline of the stable convection is found to be in the form of a double loop axially symmetric vortices, which causes the rotation during KTN crystals growth...
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