Abstract

Large size potassium titanyl phosphate (KTP) crystals were grown by spontaneous nucleation technique from the K 6P 4O 13 flux modified with the addition of MoO 3. MoO 3 suppressed the multinucleation. A cooling rate of 0.2 K h −1 yielded large crystals. Growth mechanism was revealed by optical microscopy. Etching experiments showed typical etch pits with hollow core and dislocation density in the range of 1500–20000 cm −2. Hardness measurements showed anisotropy and a decrease in hardness index with applied load.

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