The effect of cooling rate on size, quality and morphology of KTiOPO₄ (KTP) crystals grown by different nucleation techniques

Abstract

KTP crystals have been grown by two nucleation techniques namely spontaneous nucleation in flux medium and nucleation on Pt rod using K6P4O13 flux.10 °C/h, 7 °C/h, 0.8 °C/h, 0.4 °C/h and 0.2 °C/h cooling rates were applied for spontaneous nucleation and crystals up to 15 × 7 × 4 mm3 in size were grown. 1 °C/h and 0.8 °C/h cooling rates were also used for nucleation on Pt rod and crystals up to 8 × 6 × 3 mm3 in size were grown. The effect of cooling rate on size, morphology and optical quality of grown crystals by both techniques were studied. For nucleation on Pt rod upper and lower rotation rates limits and an optimum rotation rate were distinguished for each cooling rate. Quality of the grown crystals by both techniques was characterized by optical transmission analysis.

Preparation of high quality Microgranulate CrO3 based on green process design

“…At the low cooling rate, the dissolution rate of the tiny particles is fast enough to favour the aggregated particles forming the large homogeneous particles with smooth characteristics. A positive effect on the purity of the CrO 3 product is observed with the decrease of cooling rate, which is attributed to the relationship between the impurity content and the aggregation state of particles that has been reported . ICP analysis confirmed that the CrO 3 main content increased from 0.9512 to 0.9820 g/g with the cooling rate ranging from 1 to 0.1 °C · min −1 , while the impurity content decreased from 8.3 to 2.7 mg/g (Figure ), which was similar to the EDS results.…”

The Effect of Polyvinyl Alcohol Concentration on the Growth Kinetics of KTiOPO4 Nanoparticles Synthesized by the Co-precipitation Method

“…Many valuable properties of this crystal have made it a standard material in many industrial, medical, and other applications. A study on the growth conditions of KTP single crystals to improve in their properties for different applications [7][8][9], especially for SHG, was started in the late nineteenth century. Now, these crystals are industrialized, but there are a few reports of the same studies on KTP nanocrystalline.…”