Kinetic ordering of atoms in sodium chlorate–bromate solid solutions

Shtukenberg, Alexander G.; Rozhdestvenskaya, I. V.; Popov, Dmitry; Punin, Yu. O.

doi:10.1016/j.jssc.2004.05.063

Cited by 12 publications

(11 citation statements)

References 21 publications

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“…3) is a straight line, but at a composition of NaCl 0.9 Br 0.1 O 3 it is about 0.003 Å lower compared to literature data [19]. Kinetic data for (100) faces of Na(Cl,Br)O 3 are shown in figure 4 as growth rate versus temperature plots at constant supercoolings of 2.0 and 3.0 K. The oscillation curves have been calculated using the Origin software package [20] with some additional correction of the peak positions.…”

Section: Resultscontrasting

confidence: 59%

Kinetic anomalies of mixed crystal growth and their effect on the crystal isomorphic composition

Bocharov¹,

Gille

Glikin

2008

Cryst. Res. Technol.

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Growth rate anomalies in aqueous solution growth of NaClO 3 and KClO 3 were first revealed by V. V. Sipyagin in 1967 and attributed to "kinetic anomalies". These phenomena were confirmed in a series of other studies and for a variety of substances. Therefore, some universality of these anomalies was supposed that should be due to structural transformations in the liquid solutions. In this paper, we present for the first time results on growth rate oscillations found in mixed crystal growth and their impact on the isomorphic composition of solid solutions. Thick (100) Na(Cl,Br)O 3 layers were grown at fixed supercooling conditions onto NaClO 3 seeds in a microcrystallization cell equipped with an optical microscope. In the temperature range of 33 -41 °C, four kinetic anomalies were found in solutions of a chlorate : bromate molar ratio of 20 : 1 at supercoolings of 2.0 K and 3.0 K. Lattice parameter measurements of the grown Na(Cl,Br)O 3 layers revealed a linear dependence of lattice constant vs. growth rate. By measuring Vegard's law (lattice parameter vs. solid solution composition) we were able to determine the oscillations in mixed crystal composition that accompany the kinetic anomalies in solid solution systems.

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Section: Resultscontrasting

confidence: 59%

Kinetic anomalies of mixed crystal growth and their effect on the crystal isomorphic composition

Bocharov¹,

Gille

Glikin

2008

Cryst. Res. Technol.

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“…6). The asymmetrical Dx(x) dependence is not typical for the growth dissymmetrization phenomenon À it was found only for the series of Na(Cl,Br)O 3 (Shtukenberg et al, 2004). On the contrary, for the sector zoning, this feature is more common; for instance, it was found in the series of (NH 4 ) 2 (Zn,Ni)(SO 4 ) 2 Á6H 2 O (Fig.…”

Section: Fig 5 Evolution Of Intersector Difference DX = X Sr{111}mentioning

confidence: 90%

Effect of crystal composition and growth rate on sector zoning in solid solutions grown from aqueous solutions

2009

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Sector zoning in solid solutions of Tutton’s salts (NH4)2M(SO4)2.6H2O (M = Co, Ni, Zn, Mg) and nitrates of divalent metals Me(NO3)2 (Me = Sr, Pb, Ba) grown from low-T aqueous solutions under controlled conditions is studied. The effect of crystal composition and growth rate (supersaturation) on the intersector difference in concentrations of isomorphic components is examined experimentally and modelled theoretically based on the phenomenological approach to crystallization in a ‘solid solution—aqueous solution’ system. Calculations show a predominating contribution of the selective adsorption phenomena in the formation of a sector-zoned crystal with usually minor, but sometimes a major contribution of growth kinetics.

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“…Crundwell et al (1997) reported that the sodium halate mixed crystals existed in triclinic symmetry, while Shtukenberg et al (2004) reported that some crystals existed in monoclinic symmetry when x <0.255. An order distribution of isomorphous atoms (Cl and Br) was reported to be responsible for the anomalous birefringence of NaCl 1− x Br x O 3 mixed crystals (Shtukenberg et al , 2004; Crundwell et al , 1997). But the influence of the compositions of NaCl 1− x Br x O 3 mixed crystals on their crystal quality has rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Hussain et al ͑1988͒ reported that the morphology of NaCl 1−x Br x O 3 mixed crystals changed from cube to tetrahedron as x increased and anomalous birefringence in NaCl 1−x Br x O 3 mixed crystals was observed indicating that these crystals did not have cubic symmetry. Crundwell et al ͑1997͒ reported that the sodium halate mixed crystals existed in triclinic symmetry, while Shtukenberg et al ͑2004͒ reported that some crystals existed in monoclinic symmetry when x Ͻ 0.255. An order distribution of isomorphous atoms ͑Cl and Br͒ was reported to be responsible for the anomalous birefringence of NaCl 1−x Br x O 3 mixed crystals ͑Shtukenberg et Crundwell et al, 1997͒. But the influence of the compositions of NaCl 1−x Br x O 3 mixed crystals on their crystal quality has rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Characterization of unidirectionally grown NaCl_1−xBr_xO₃ crystals

Song

Zhang

et al. 2009

Powder Diffr.

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NaCl1−xBrxO3 single crystals were prepared by unidirectional crystallization. The influences of the composition on structure, quality, and optical properties of NaCl1−xBrxO3 crystals were investigated. X-ray powder diffraction analysis revealed that the diffraction patterns for the NaCl1−xBrxO3 crystals have almost the same set of peaks as those of NaClO3 and NaBrO3, except that an extra very weak forbidden (100) diffraction peak was detected at about 13.3° 2θ for crystals grown from solutions of BrO3−∼15–70 at. % (i.e., x=0.15–0.70). These crystals can, therefore, be considered to have a distorted cubic structure closely related to the cubic structures of NaClO3 (x=0) and NaBrO3 (x=1). Our study also found that good-quality crystals can only be obtained in two doping ranges (x>0.75 or x<0.10). Outside these two ranges, the crystals tended to crack and even became opaque. Lattice distortions in the crystals were the probable cause as revealed by X-ray powder diffraction patterns. The optical activity of NaCl1−xBrxO3 crystals measured by a laser was found to decrease from 2.89 to 2.01°/mm with increasing value of x from 0 to 0.02. Stimulated Raman scattering of NaBr0.90Cl0.10O3 crystals was measured using a 0.532-μm ps laser as a pump source and four anti-Stokes lines plus six Stokes lines were observed. The fourth anti-Stokes emission was found to be at 454.5 nm and the sixth Stokes emission at 713.6 nm. Its Raman gain coefficient was determined to be 18.4 cm/Gw.

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Kinetic ordering of atoms in sodium chlorate–bromate solid solutions

Cited by 12 publications

References 21 publications

Kinetic anomalies of mixed crystal growth and their effect on the crystal isomorphic composition

Kinetic anomalies of mixed crystal growth and their effect on the crystal isomorphic composition

Effect of crystal composition and growth rate on sector zoning in solid solutions grown from aqueous solutions

Characterization of unidirectionally grown NaCl_1−xBr_xO₃ crystals

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Kinetic ordering of atoms in sodium chlorate–bromate solid solutions

Cited by 12 publications

References 21 publications

Kinetic anomalies of mixed crystal growth and their effect on the crystal isomorphic composition

Kinetic anomalies of mixed crystal growth and their effect on the crystal isomorphic composition

Effect of crystal composition and growth rate on sector zoning in solid solutions grown from aqueous solutions

Characterization of unidirectionally grown NaCl1−xBrxO3 crystals

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Characterization of unidirectionally grown NaCl_1−xBr_xO₃ crystals