Calculations of the tin-tellurium system

Clavaguera-Mora, M.T.; Comas, C.; Clavaguera, N.

doi:10.1016/0364-5916(94)90024-8

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…The stoichiometry and the facet formation can be qualitatively controlled by the growth temperature. According to the phase diagram of the Sn−Te compound, 33 the SnTe crystal is solidified from the liquid phase of SnTe below the congruent melting temperature of 806 °C, while the compound SnTe + Te is solidified from the liquid phase at a eutectic temperature of 401 °C where Te is in rich. Therefore, at relatively high growth temperatures, vaporized Sn and Te can directly react and form SnTe crystals.…”

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confidence: 99%

Single Crystalline Nanostructures of Topological Crystalline Insulator SnTe with Distinct Facets and Morphologies

Shao²,

Li³

et al. 2013

Nano Lett.

100

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Topological crystalline insulators (TCIs) are a new class of topological materials that possess unique metallic surface states protected by crystalline mirror symmetry. Their topological surface properties are expected to strongly depend on the surface orientation. By combining density functional theory (DFT) calculations and synthesis experiments, we demonstrate the controlled growth of single crystalline nanostructures of the prototypical TCI SnTe with distinct facets and morphologies. Our calculations suggest that the excess energy of the {111} surfaces can be either higher or lower than that of the {100} surfaces, depending on the stoichiometry, while the {110} is always higher than the {100}. In our synthesis experiment, we qualitatively controlled the stoichiometry by tailoring the growth temperature and obtained two types of single crystalline nanowires: smooth nanowires dominated by {100} facets at high temperatures and zigzag nanowires composed of both {100} and {111} surfaces at low temperatures. Notably, there is no {110} facet in our nanostructures, strongly supporting the DFT calculations. Our device fabrication and electrical characterizations suggest that both types of nanowires are suitable for transport studies of topological surface states.

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confidence: 99%

Single Crystalline Nanostructures of Topological Crystalline Insulator SnTe with Distinct Facets and Morphologies

Shao²,

Li³

et al. 2013

Nano Lett.

100

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“…As in the previous work (12), data not tabulated in original publications were read off published phase diagrams. [3] RT ln y, = 24 770 J mol-' which was assumed to be temperature independent. The calculated eutectic was 7 19"C, x, = 0.400 and there was 5 mol% solubility of NaF in KF at the eutectic temperature.…”

Section: Critical Analysis Of Thermodynamiclphase Diagram Data For Bimentioning

confidence: 99%

“…Once the thermodynamic properties of simple and solution phases are known, a computer can be used to carry out the iterative process involved in calculating the phase boundaries at equilibrium (2). This is a general approach, which can and has been adapted successfully to the calculation of binary and ternary phase diagrams of alloy systems (3,4), common-ion and reciprocal ternary molten salt systems (5)(6)(7)(8), and organic systems (9-1 1). In this article, this type of calculation is applied to binary molten salt systems containing cations Na,K,Ba and anions F,Mo04,W04.…”

Section: Introductionmentioning

confidence: 99%

Calculation of phase diagrams and thermodynamic properties of 18 binary common-ion systems of Na,K,Ba//F,MoO₄,WO₄

Sangster¹

1996

Can. J. Chem.

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Phase diagram and thermodynamic data of 18 binary common-ion molten salt systems in Na,K,Ba//F,MoO,,WO, were optimized by computer algorithm. The phase diagram data as well as single-salt data were retrieved from an extensive critical literature search. Expressions for the excess properties of solution phases and thermodynamic properties of intermediate compounds were thereby obtained. These data were used to generate a "best" phase diagram for each binary system considered.Key words: molten salts, phase diagrams, thermodynamic properties.Resume : On a fait un lissage par ordinateur des donnCes thermodynamiques et des diagrammes de phases de 18 systemes de sels fondus d'ions communs reprCsentCs par Na,K,Ba//F,MoO,,WO,. Les donnCes de diagramme de phases et des sels purs ont CtC obtenues 2 moyen d'une recherche critique bibliographique assez complete. On a donc obtenu des expressions analytiques pour les propriCtCs en excLts des solutions ainsi que les propriCtCs thermodynamiques des composCs intermbdiaires. Ces expressions ont CtC utilisCes dans le calcul du diagramme de phases de chaque systeme.

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Length Scale and Dimensionality of Defects in Epitaxial SnTe Topological Crystalline Insulator Films

Dagdeviren

Zhou

Zou

et al. 2017

Adv Materials Inter

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surface states of topological insulators are protected by time reversal symmetry, which makes them impervious to nonmagnetic perturbations and restricts scattering. [1,3,4] For these reasons, topological insulators have garnered great interest. [1,2] Topological crystalline insulators (TCIs) are a subset of topological materials that are narrow band gap semiconductors in the bulk with gapless surface states; however, the topological surface states are protected by lattice symmetry rather than time reversal symmetry. [2,[5][6][7][8][9][10][11][12][13][14][15][16] Topological crystalline insulators have been theoretically predicted and experimentally realized on compounds with orbital degrees of freedom playing a similar role to spin in topological insulators; [2,[5][6][7][8][9][10][11][12][13][14][15][16] one such material is SnTe. [5][6][7][8][9][10][11][12][13][14][15][16] The key role played by surface symmetry in protecting the topological states suggests that the TCI properties can be manipulated by introducing symmetry breaking surface features. As a first step toward this goal, we have studied the epitaxial growth of SnTe films and characterized their structural and electronic properties. It will be shown that the growth process and subsequent postgrowth treatment creates characteristic defects that can alter the local electronic properties of the surface down to the atomic scale.Topological crystalline insulators (TCIs) are new materials with metallic surface states protected by crystal symmetry. The properties of molecular beam epitaxy grown SnTe TCI on SrTiO 3 (001) are investigated using scanning tunneling microscopy (STM), noncontact atomic force microscopy, low-energy and reflection high-energy electron diffraction, X-ray diffraction, Auger electron spectroscopy, and density functional theory. Initially, SnTe (111) and (001) surfaces are observed; however, the (001) surface dominates with increasing film thickness. The films grow island-by-island with the [011] direction of SnTe (001) islands rotated up to 7.5° from SrTiO 3 [010]. Microscopy reveals that this growth mechanism induces defects on different length scales and dimensions that affect the electronic properties, including point defects (0D); step edges (1D); grain boundaries between islands rotated up to several degrees; edge-dislocation arrays (2D out-of-plane) that serve as periodic nucleation sites for pit growth (2D in-plane); and screw dislocations (3D). These features cause variations in the surface electronic structure that appear in STM images as standing wave patterns and a nonuniform background superimposed on atomic features. The results indicate that both the growth process and the scanning probe tip can be used to induce symmetry breaking defects that may disrupt the topological states in a controlled way.

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Calculations of the tin-tellurium system

Cited by 9 publications

References 5 publications

Single Crystalline Nanostructures of Topological Crystalline Insulator SnTe with Distinct Facets and Morphologies

Single Crystalline Nanostructures of Topological Crystalline Insulator SnTe with Distinct Facets and Morphologies

Calculation of phase diagrams and thermodynamic properties of 18 binary common-ion systems of Na,K,Ba//F,MoO₄,WO₄

Length Scale and Dimensionality of Defects in Epitaxial SnTe Topological Crystalline Insulator Films

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Calculations of the tin-tellurium system

Cited by 9 publications

References 5 publications

Single Crystalline Nanostructures of Topological Crystalline Insulator SnTe with Distinct Facets and Morphologies

Single Crystalline Nanostructures of Topological Crystalline Insulator SnTe with Distinct Facets and Morphologies

Calculation of phase diagrams and thermodynamic properties of 18 binary common-ion systems of Na,K,Ba//F,MoO4,WO4

Length Scale and Dimensionality of Defects in Epitaxial SnTe Topological Crystalline Insulator Films

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Calculation of phase diagrams and thermodynamic properties of 18 binary common-ion systems of Na,K,Ba//F,MoO₄,WO₄