Results of investigations of the changes in growth rate inherent to crystals (i.e., independent of macroscopic external conditions) during a 15-h growth period are presented. The results of the investigations regarding the time evolution of the growth rate dispersion are also presented. The majority of the investigations were carried out with sodium chlorate crystals, and several experiments were carried out with potassium dihydrogen phosphate (KDP) and Rochelle salt crystals. It was found that, for the majority of the crystals, the main changes in growth rate occurred in the initial growth stage, which extended to for up 4 h. These growth rates probably slowly decrease toward the end of the growth run. Some of the very high initial growth rates that decreased during the initial growth period were followed by relatively high intermediate growth rates for the next few hours and then subsequently decreased. The growth rates for the majority of crystals probably gradually decreased after 15 h of growth. The results obtained show that these changes, which have not previously been taken into account, should be included in the interpretation of growth rate changes affected by various parameters (supersaturation, temperature, fields, stress, impurities, etc.). The obtained results could improve the current crystal growth theories, which are based on the design of specific growth conditions that result in a target product.

Supersaturation

Sodium chlorate

10.1021/ie102425z

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Study of the Effect of Supersaturation Changes on the Growth of {100} KDP Crystal Faces

ACS Omega (2025)

Biljana Z. Maksimović Andrijana Žekić Branislava M. Vučetić Milica M. Milojević Vladislav Jovanov

This study investigates the growth of {100} KDP crystal faces under varying supersaturation conditions of 6.2-14.7%. The findings indicate that the positions of growth rate maxima differ between experiments where supersaturation increases or decreases, with higher rates associated with decreasing supersaturation. Surface analysis via SEM and AFM revealed that higher supersaturation resulted in greater roughness. The growth rate on supersaturation dependence R(σ) for both types of experiments was best described by parabolic and power law models, indicating spiral growth. A significant percentage of crystal faces exhibited an exponent n > 2, suggesting the relevance of the multiple nucleation model. Additional analysis excluded the suggested model in favor of the polynuclear model. No significant difference was found between the arithmetic means of n values for both types of experiments, suggesting that for the investigated supersaturation range, the growth mechanism of {100} KDP crystal faces is independent of growth history.

Supersaturation

Crystal (programming language)

10.1021/acsomega.4c09287

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Structural properties and proton conductivity of the 12-tungstophosphoric acid doped aluminosilicate gels

Solid State Ionics (1999)

U.B. Mioč S.K. Milonjić Viktor Stamenković Miloš Radojević Philippe Colomban

Alkoxide

10.1016/s0167-2738(99)00204-0

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Citations (26)