Pyramids on {100} NaCl after formamide etching

Radenovic, N.; Enckevort, Willem van

doi:10.1016/s0022-0248(01)01740-7

Cited by 12 publications

(16 citation statements)

References 10 publications

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“…On the other hand, if they were grown at low evaporation rate (or at low supersaturation) cubic crystals were formed. In our previous experimental work on the growth of NaCl crystals from water solutions [5,6] and in many other trial experiments that we performed, we never observed {1 1 1} faces. We did observe, however, cubes resting on an {1 1 1} face which have the appearance of octahedrons and that we will refer to as ''resting cubes''.…”

Section: Introductionmentioning

confidence: 56%

Formamide adsorption and habit changes of alkali halide crystals grown from solutions

Radenovic

Enckevort

Vlieg

2004

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 56%

Formamide adsorption and habit changes of alkali halide crystals grown from solutions

Radenovic

Enckevort

Vlieg

2004

Journal of Crystal Growth

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“…Recently, Radenović et al confirmed these results by evaporating (at T = 25°C) NaCl aqueous solutions containing up to 30% formamide, and outlined that its presence enhances the quality of NaCl crystals, since the number of fluid inclusions sharply decreases with respect to those found after growth from pure aqueous solutions. Moreover, determining the structure of the {111} NaCl‐liquid interface through a surface X‐ray diffraction (SRXD) and using ultra‐thin water or formamide layers, the Vlieg's team showed that the crystal surface is smooth at an atomic level and is not reconstructed.…”

Section: Resultsmentioning

confidence: 89%

Anomalous mixed crystals: a peculiar case of adsorption/absorption

Aquilano

Pastero

2013

Crystal Research and Technology

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The paper deals with the peculiar case of adsorption/absorption in which the impurity is adsorbed and, successively, incorporated in a growing crystal, giving rise to a bi-phased system: the host dominant crystal and the guest impurity crystallized as thin lamellae in selected growth sectors. The historical path is revisited, since the pioneering papers by Johnsen, Gaubert, Neuhaus and Seifert, through the works of Kern's and Hartman's Schools who verified the theoretical hypotheses on the growth mechanisms, initially put forward by Bunn, Royer and Kleber. An important attention is paid to the interesting case study represented by the system NaCl/CdCl 2 , both for the pure adsorption of CdCl 2 on the NaCl crystal faces and for the formation of a three dimensional mixed salt of composition CdCl 2 ·2 NaCl·3H 2 O. The core of the work is devoted to two highlighting examples of adsorption/absorption. In the first one, varying concentrations of lithium ions present as impurity in aqueous CaCO 3 solutions, act as habit modifiers of the growing calcite crystals (adsorption) and, contemporarily, enter the calcite lattice in selected growth sectors, as Li 2 CO 3 iso-oriented lamellae (absorption). All this has been proved by X-ray powder diffraction diagrams (XRPD), cathode-luminescence and atomic force microscopy (AFM) measurements. In the second example, the well known example of habit modification of NaCl crystals growing from aqueous solution in the presence of formamide is recovered and newly investigated in the light of up to date experimental and theoretical analyses. NaCl crystals were obtained from water-formamide (H-CO-NH 2 ) solutions, either by slow evaporation or by programmed cooling of saturated solutions, the formamide concentration ranging from 0 to 100%. Accordingly, the crystal morphology changes from {100} (pure aqueous solution) to {100} + {111} (water-formamide solutions) to {111} (pure formamide solution). X-ray powder diffraction diagrams prove that formamide is not only adsorbed on the {111} NaCl octahedron but is also selectively captured within the {111} growth sectors. The 2D-lattice coincidences between the d 101 layers of formamide and the NaCl -d 111 ones suggest that formamide can be adsorbed as ordered epitaxial layers; further, the equivalence between the thickness of the elementary layers d indicates that formamide is allowed to be buried (absorption) in the growing crystal. Hence, one can ultimately state that formamide is not only an habit modifier of NaCl crystals, but that "anomalous NaCl/formamide mixed crystals" form, limited to the {111} NaCl growth sectors.

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“…Research on single salt crystallisation from solutions is still needed. The latest advances have focused on the use of new and precise tools such as Environmental Scanning Electron Microscopy [20], Atomic Force Microscopy [21], X-ray Computed Tomography [22] or Nuclear Magnetic Resonance [23]. Studies on the heat release and crystallisation from salts primarily use thermal sensors and identify the links between the type of salt and the environmental conditions [24,25].…”

Section: Introductionmentioning

confidence: 99%

Infrared thermography monitoring of the NaCl crystallisation process

Vázquez¹,

Thomachot-Schneider²,

Mouhoubi³

et al. 2015

Infrared Physics & Technology

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Quantitative investigation of the crystallisation of NaCl from evaporating droplets.-Infrared thermography revealed different crystal growth processes.-The thermosignal depended on variations in the emissivity and temperature.-Intermittent drops in the thermosignal revealed solution creeping processes.-Infrared thermography permitted, for the first time, the in-situ observation of the creeping phenomenon.

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Pyramids on {100} NaCl after formamide etching

Cited by 12 publications

References 10 publications

Formamide adsorption and habit changes of alkali halide crystals grown from solutions

Formamide adsorption and habit changes of alkali halide crystals grown from solutions

Anomalous mixed crystals: a peculiar case of adsorption/absorption

Infrared thermography monitoring of the NaCl crystallisation process

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