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Growth of KTN crystals by double crucible Czochralski method

Abstract Potassium tantalite niobate (KTa1−xNbxO3, KTN) single crystals with various compositions and sizes were grown by double crucible Czochralski method in KTaO3–KNbO3 solid solution system. All the crystals we have grown are in good transparence and are >1 cm in size. Growth habit, morphological, structural and homogeneity properties of five different compositions of KTN crystals, including KTaO3, KTa0·91Nb0·09O3, KTa0·81Nb0·19O3, KTa0·75Nb0·25O3 and KTa0·63Nb0·37O3, are investigated in this work. Electron probe microanalysis shows that the composition fluctuation of KTN crystal is <0·0003 cm−1. X-ray diffraction experimental results show that all crystals belong to cubic phase at room temperature. Lattice parameters a are 3·984∼3·994 Å, which corresponded to the composition of x = 0∼0·37. High resolution XRD measurement shows that all KTN crystals are in high integrity and good quality. Our work shows that the KTN crystals we have grown are in good quality and have a broad application prospects.