Journal ArticleDOI
Effect of chelating agent (1,10-phenanthroline) on potassium hydrogen phthalate crystals
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TLDR
In this article, the influence of 1,10-phenanthroline (Phen) on the growth of KHP single crystals at 30° was investigated, and it appears that the growth promoting effect (GPE) of Phen is caused by the adsorption of the organic additive on the prism of the KHP crystals.Abstract:
The influence of a new organic additive, chelating agent 1,10-phenanthroline (Phen) (∼5.0·10−3 M L−1) on potassium hydrogen phthalate (KHP) single crystals at 30° is investigated. The crystals were grown from the aqueous solutions of pH ∼4.5 at constant temperature by solvent evaporation technique. The chelating agent leads to an increase in metastable zone width and assists the bulk growth process. The growth rate of crystals in the presence of Phen decreases considerably with an increase in impurity concentration. Not much variation is observed in FTIR and cell parameter values, determined by XRD analysis. It appears that the growth promoting effect (GPE) of Phen is caused by the adsorption of the organic additive on the prism of KHP crystals. Differential scanning calorimetry (DSC) and TG-DTA studies reveal the purity of the sample and no decomposition is observed up to the melting point. Scanning electron microscope (SEM) photographs exhibit the effectiveness of the impurity in changing the surface morphology of KHP crystals. Contrary to expectations, Phen depresses the NLO efficiency of KHP, suggesting that the molecular alignments in the presence of Phen results in cancellation effects disturbing the non-linearity.read more
Citations
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Thermal analysis, effect of dopants, spectral characterisation and growth aspects of kap crystals
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Edible wheat gluten (WG) protein films
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[1]Benzofuro[3,2- c ]pyridine synthesis and coordination reactions
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Spectral and thermal characteristics of copper(II) carboxylates with fatty acid chains and their benzothiazole adducts
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Nickel ferrite nanoparticles synthesis from novel fumarato-hydrazinate precursor
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References
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Journal ArticleDOI
A Powder Technique for the Evaluation of Nonlinear Optical Materials
S. Kurtz,T. T. Perry +1 more
TL;DR: In this article, an experimental technique using powders is described which permits the rapid classification of materials according to the magnitude of nonlinear optical coefficients relative to a crystalline quartz standard and the existence or absence of phase matching direction(s) for second-harmonic generation.
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Crystal growth
TL;DR: This report introduces briefly some concepts and materials on crystal growth presented by Dr. Zhen-yu Zhang from the Oak Ridge (TN) National Laboratory, and Dr. En-ge Wang from the Institute of Physics, Chinese Academy of Sciences in a session on Crystal growth at the first Chinese-American Frontiers of Science Symposium.
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Effects of impurities on crystal growth processes
TL;DR: In this paper, the authors surveyed the mechanisms of adsorption of impurities during the growth of bulk crystals, where the impurities considered are foreign substances deliberately added to or inherently present in a growth medium.
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Stability of KH2PO4 and K(H,D)2PO4 solutions at fast crystal growth rates
TL;DR: In this article, the stability of K(H,D) 2 PO 4 (DKDP) solutions was investigated under the conditions required for rapid growth of large crystals, and a metastable zone of up to 40°C in width and induction periods of more than 3 months were obtained in stirred solutions.
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Metastable zone-width of some aqueous solutions
TL;DR: In this article, the metastable zone-widths of 25 different systems and their dependence on the cooling rate, the temperature and the presence or absence of crystals are reported and the results are discussed.