Phenomena and mechanisms of mixed crystal formation in solutions I. General concept on the example of the system KHC8H4O4–RbHC8H4O4–H2O

Glikin, A. É.; Kovalev, S. I.; Руднева, Е. Б.; Kryuchkova, Lyudmila Yu.; Волошин, А. Э.

doi:10.1016/s0022-0248(03)01189-8

Cited by 35 publications

(27 citation statements)

References 6 publications

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“…In the first part of this article [1], we described the main characteristics of isomorphous replacement in crystals in solutions by an example of potassium acid phthalate (KAP)-rubidium acid phthalate (RbAP)-water system and also the kinetics of the process and morphology of the products formed. Isomorphous replacement is a particular case of heteroepitaxy in the systems with isomorphous components, which occurs at isothermal contact of a saturated liquid and a solid phase whose compositions not correspond to the condition of interphase equilibrium (we call them ''mutually nonequilibrium phases'').…”

Section: Introductionmentioning

confidence: 99%

“…Numerous observations of such processes in aqueous solutions demonstrated the correlation between the forming surface morphology and the solubility ratio of the system components. The physicochemical analysis with the use of the concentration phase diagrams allowed Glikin et al [1,[3][4][5][6][7][8][9][10][11][12] to suggest the following model. If the solubility of the phase to be crystallized is lower than the solubility of the initial crystal (volume deficit replacement) the formation of individual islands alternating with pits and deep channels is observed.…”

Section: Introductionmentioning

confidence: 99%

“…Below, we present the results obtained in atomic force microscopy study performed, as in Ref. [1], for the KAPRbAP-H 2 O system. We also analyzed the problem theoretically with due regard for the results obtained in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…We also analyzed the problem theoretically with due regard for the results obtained in Refs. [1,[3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Phenomena and mechanisms of mixed crystal formation in solutions II. Mechanism of interface processes

Волошин

Kovalev

Руднева

et al. 2004

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…We also analyzed the problem theoretically with due regard for the results obtained in Refs. [1,[3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Phenomena and mechanisms of mixed crystal formation in solutions II. Mechanism of interface processes

Волошин

Kovalev

Руднева

et al. 2004

Journal of Crystal Growth

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“…The experimental procedure reduced to the following [6,7]. The KDP solution was prepared from the KDP salt with a specified purity grade and triply distilled water.…”

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confidence: 99%

Influence of the Magnetic Field on the Solubility of Crystals

2014

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Influence of the magnetic treatment of KDP and ADP crystals and solutions on their equilibrium temperature is revealed and investigated. The maximum change of the temperature is observed right after magnetization. Then the effect monotonically decreases and in 5 h the temperature approaches its equilibrium value. It is established that the observed decrease in the solubility depends on the impurity content and is maximum for magnetically treated KDP crystals with chromium impurity; it further decreases in the series: KDP crystal, KDP-ADP crystals in KDP-ADP solution, KDP crystal in KDP-ADP solution, and KDP solution. Relaxation times are determined for all five examined systems. It is revealed that the effect fast increases and then is saturated at B = 0.02 T.The influence of the preliminary magnetic treatment on the state of the NaCl crystal surface was first established morphologically from the change of etching patterns in [1], where it was assumed that treatment of crystals in the magnetic field leads to the distortion of the metastable state of the impurity complexes. This qualitative approach was supplemented by quantitative observations. The influence of the preliminary treatment of NaCl crystals by pulsed magnetic field on the crystal solubility was investigated in [2]. The magnetic field strength per pulse was 8·10 5 A/m, the pulse repetition frequency was 12 Hz, and the pulse duration was 3 ms with leading pulse front duration of 0.3 ms. The magnetic treatment lasted 10 min.The solubility of NaCl crystals was measured gravimetrically (by the weight losses) in a 70% solution of ethyl alcohol. Dissolution was performed along {100} faces. It appeared that preliminary magnetic treatment of crystals reduced by 30% their specific solubility in comparison with the specific solubility of the reference samples (not subjected to magnetic treatment).According to [2], the effect of magnetic influence consists in the influence of the magnetic field on paramagnetic impurity centers. Such influence distorts the metastable state of the centers thereby leading to redistribution of impurity and other point defects. It was established that after magnetic treatment, the dissolution on the most part of the crystal surface proceeds by the polishing mechanism -by uniform level-by-level removal of the material -whereas some local regions with sizes 10-100 m are less soluble. This means that magnetic treatment changes the impurity state locally -in some regions -rather than on the entire surface.The influence of the magnetic field on the processes of crystal growth and dissolution was further investigated in a number of more recent studies. Thus, in [3] the influence of the magnetic treatment on the electrodeposition of copper, that is, its deposition on the electrode surface was observed in the course of an electrochemical reaction. In [4] it was revealed that the morphology of etching pits of paracetamol crystals also changed in the field B = 0.5 T acting for 15 min. The influence of the magnetic field on the morphology of t...

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Replacement of Monocrystals

Polymineral-Metasomatic Crystallogenesis

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Phenomena and mechanisms of mixed crystal formation in solutions I. General concept on the example of the system KHC8H4O4–RbHC8H4O4–H2O

Cited by 35 publications

References 6 publications

Phenomena and mechanisms of mixed crystal formation in solutions II. Mechanism of interface processes

Phenomena and mechanisms of mixed crystal formation in solutions II. Mechanism of interface processes

Influence of the Magnetic Field on the Solubility of Crystals

Replacement of Monocrystals

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