Morphology and crystal growth of pure calaverite

Balzuweit, Karla; Meekes, Hugo; Bennema, P.

doi:10.1088/0022-3727/24/2/017

Cited by 9 publications

(3 citation statements)

References 18 publications

(16 reference statements)

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“…The indexing {hklm} is to a large extent clear and unambiguous and consistent with the results of x-ray and neutron analy- discovered by Amelinckx and co-workers, that da-92 forms {hk/m} were determined have been grown in the and growth Phenomena occurring on faces {hklm} and related faces. Also the new results on surface observations occurring on calaverite will be reported [15]. It is clear from these studies that structure and growth processes Occurring on these faces are not at all well understood.…”

Section: 52mentioning

confidence: 90%

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Bennema¹,

Balzuweit²,

Dam³

et al. 1991

J. Phys. D: Appl. Phys.

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A survey is given of new types of crystallographic faces and forms occurring on modulated crystals which have to be indexed with four integers (hklm). These faces have so far been found on modulated crystals with an average beta -K2SO4 structure which can be grown from an aqueous solution and the mineral crystal calaverite (AuTe2) which can be grown from the melt. Interesting data on crystal growth obtained from in situ observations are presented. Among others, spiral-like patterns can be recognized. The occurrence on quasicrystals of crystal forms to be indexed with six integers (hklmno) is discussed and it is shown that these faces can in principle be explained by a generalization of the Hartman-Perdok theory. Crystal forms (hklm) and (hklmno) occurring on modulated and quasicrystals respectively can be explained by the higher than three-dimensional crystallography of de Wolff, Janner and Janssen (1977) where these crystals are considered as three-dimensional cuts out of a higher than three-dimensional truly translational invariant structure.

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Section: 52mentioning

confidence: 90%

“…'be obtained in a similar way. For example, a structure having a diffraction pattern of icosahedral symmetry can be obtained from a sixdimensional periodic structure with lattice spanned by basis vectors (e19el), (ez, -e2), (e3, -4 (e4, -el), ( e ~, -4 ( e 6 , -5 ) (15) where el, . .…”

Section: Quasi-periodic Structures and Higher-dimensionalmentioning

confidence: 99%

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Bennema¹,

Balzuweit²,

Dam³

et al. 1991

J. Phys. D: Appl. Phys.

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“…Contrary to the case of [(CH3)nN]2ZnC14, numerous as well as large satellite faces can be found on as-grown crystals of AuTe 2, both for mineral crystals found in nature and for synthetically prepared crystals (Balzuweit, Meekes & Bennema, 1991). The incommensurate structure of AuTe 2 can be characterized with a monoclinic lattice A, 13 = 90.038 °, lall = 7.1947, la21 = 4.4146 and[a31 = 5.0703 ,~ (Schutte &de Boer, 1988).…”

Section: Discussionmentioning

confidence: 69%

Equilibrium morphology of incommensurately modulated crystals: a superspace description

Kremers¹,

Meekes²,

Bennema³

et al. 1995

Acta Cryst Sect A

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The theory for the explanation of equilibrium morphologies of incommensurately modulated one-dimensional crystals, presented in a previous paper, is extended to the case of incommensurately modulated three-dimensional crystals. It is shown that, concerning the morphology, there exists a one-to-one correspondence between faces on the physical crystal and crystallographic hyperplanes of the embedded crystal in superspace. This holds for both main faces and satellite faces. The occurrence of the latter, however, is unique for incommensurately modulated crystals. It is shown that the stability of satellite faces, as well as main faces, can be attributed to a principle of selective cuts. The superspace approach that is developed leads to a calculation method for surface free energies that, in principle, can be applied to incommensurately modulated structures of arbitrary complexity. Equilibrium morphologies are constructed ©1995 Intemational Union of Crystallography Printed in Great Britain -all fights reserved from the calculated surface free energies by means of a standard Wulff plot. The dependence of the equilibrium morphology on several structural parameters is studied for an incommensurately modulated simple cubic model crystal. This study allows for a basic understanding of the differences in morphology of AuTe 2 crystals and [(CH3)4N]2ZnC14 crystals.

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Preparation and Crystal Growth of Transition Metal Dichalcogenides

Schmidt

Gooth²,

Binnewies³

2020

Zeitschrift anorg allge chemie

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Dichalcogenides are known from almost all transition metals. The representatives of this class of compounds show a number of interesting physical and chemical properties depending on their constituent transition metal and crystal structure, which makes them interesting for basic studies and applications in high‐end electronics, spintronics, optoelectronics, energy storage, flexible electronics, DNA sequencing and personalized medicine to this day. Many of these properties and effects can only be investigated on chemically and crystallographically pure samples ‐ usually on single crystals. The vast majority of these compounds can be crystallized using chemical vapour transport. However crystallization from the melt is also possible in a considerable number of compounds, including the frequently used self‐flux technique. For several compounds the crystallization from different solvents or solvent mixtures by means of solvothermal or hydrothermal synthesis is described.

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Morphology and crystal growth of pure calaverite

Cited by 9 publications

References 18 publications

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Equilibrium morphology of incommensurately modulated crystals: a superspace description

Preparation and Crystal Growth of Transition Metal Dichalcogenides

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