Synthesis, structure and electrical properties of a new tin vanadium selenide

Atkins, Ryan; Disch, Sabrina; Jones, Zachary; Haeusler, Ines; Grosse, Corinna; Fischer, Saskia F.; Neumann, Wolfgang; Zschack, P.; Johnson, David C.

doi:10.1016/j.jssc.2013.03.008

Cited by 45 publications

(101 citation statements)

References 37 publications

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“…While prior TEM investigations showed that this synthesis approach can result in a variety of different volume defects [24], this particular sample appears structurally homogeneous. The STEM images reveal that different constituent layers have different local orientations resulting in a lack of long-range periodicity, consistent with prior literature [23].…”

Section: Introductionsupporting

confidence: 89%

“…The synthesis of the [(SnSe) 1.15 ] 1 (VSe 2 ) 1 sample used in this study followed the previously published procedure [23]. The specular X-ray diffraction pattern contained only 00l reflections and the c-lattice parameter, 1.20127(4) nm, is slightly smaller than the lattice parameter range reported for different samples in a previous publication, 1.2027(7)-1.2032(7) nm [23].…”

Section: Resultsmentioning

confidence: 96%

“…Figure 1 contains a sequence of STEM images of a representative example of one of these new compounds, [(SnSe) 1.15 ] 1 (VSe 2 ) 1 [23] at increasing levels of magnification. The STEM image in Figure 1C clearly shows the alternating layers consisting of two SnSe planes and a Se-V-Se trilayer.…”

Section: Introductionmentioning

confidence: 99%

“…For [(SnSe) 1.15 ] 1 (VSe 2 ) 1 prior X-ray investigations yielded a c lattice parameter of 1.203(1) nm, a square in plane a-lattice parameter of 0.593(1) nm for the SnSe constituent and a hexagonal in plane a-lattice parameter of 0.341(1) nm for the VSe 2 constituent. X-ray and conventional electron diffraction along [hkl] where [hkl] (h, k≠0; l≠0) contain broad smears and no evidence of a superlattice c-axis lattice parameter, indicating coherence lengths of about (1-2) nm in these mixed-index directions [23].…”

Section: Introductionmentioning

confidence: 99%

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Insights from STEM and NBED studies into the local structure and growth mechanism of misfit layered compounds prepared using modulated reactants

Häusler

Atkins

Falmbigl

et al. 2014

Zeitschrift Für Kristallographie - Crystalline Materials

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X-ray diffraction and transmission electron microscopy were used to probe the structure of the misfit compound [(SnSe) 1.15 ] 1 (VSe 2 ) 1 grown using an elementally modulated precursor. The specular X-ray diffraction pattern contained only 00l reflections, which yielded a c lattice parameter of 1.203(1) nm. Cross-section STEM revealed alternating layers of SnSe and VSe 2 , in agreement with the structure model refined from the X-ray diffraction pattern using Rietveld refinement. Plan-view transmission electron microscopy revealed the in-plane grain structure of the films, yielding grain sizes in agreement with previously reported in plane X-ray diffraction studies and the cross-section STEM images. The plan view images also contained Moiré fringes resulting from grains with different relative tilting on both sides of interfaces as well as Moiré fringes resulting from different relative rotations between domains. An energy-filtered nano-beam electron diffraction pattern obtained from at least one domain in the [(SnSe) 1.15 ] 1 (VSe 2 ) 1 sample investigated in cross section contained a series of resolvable supercell reflections along the c axis that indicated that the supercell c-axis lattice parameter was a multiple of three times that determined using X-ray diffraction. Energy filtered NBED of plan-view samples showed diffraction patterns from select regions with 12-fold symmetry, indicating that the arrangement of the layers is not rotationally random from layer to layer. This suggests that during the self-assembly of the amorphous modulated elemental precursor, the SnSe and VSe 2 constituent layers must nucleate off the adjacent interfaces of the growing crystal, yielding layers that are locally rotationally aligned with growing crystal. Different processing conditions during the precursor to crystal selfassembly might enable the domain size and/or the extent of order to be controlled.

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Section: Introductionsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Insights from STEM and NBED studies into the local structure and growth mechanism of misfit layered compounds prepared using modulated reactants

Häusler

Atkins

Falmbigl

et al. 2014

Zeitschrift Für Kristallographie - Crystalline Materials

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“…Prominent examples include the remarkable properties of graphene, 1-3 the transition from an indirect to a direct band gap predicted for MoSe 2 when thinning the bulk down to a monolayer, 2,4,5 and a charge density wave transition in composites containing monolayers of VSe 2 separated by layers of SnSe. [6][7][8] A change from 3D to 2D has also been shown to lead to changes in interlayer coupling, the degree of quantum confinement and in electronic structures. 9 The intriguing properties of nanocomposites arise in many different ways: from how the constituents' properties interact, 10 from the effects of the nanoscale dimensions on the constituents, 8 or from the interface effects amplified by the nanoscale dimensions.…”

Section: Introductionmentioning

confidence: 99%

Density functional theory calculations of the turbostratically disordered compound[(SnSe)1+y]m(VS

Rudin

Johnson

2015

Phys. Rev. B

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Among composite materials that layer constituent substances of nanoscale thicknesses, [(SnSe) 1+y ] m (VSe 2 ) n emerges as an example where the constituents retain incommensurate lattice structures. Perpendicular to the stacking direction, the system exhibits random translations and random rotations on average, i.e. turbostratic disorder, with local regions showing twelvefold diffraction patterns. Earlier theoretical work on these structures showed that combining density functional theory with an empirical treatment of the van der Waals interaction gave structural parameters in good agreement with experiment, but no attempt was made to examine the relative orientations. Here we approximate the extended system with one extended constituent and one finite constituent, which allows the treatment of all relative orientations on equal footing. The calculations show how the twelvefold periodicity follows from how the ions of the SnSe layer lock in with favored positions relative to the VSe 2 layer, and the associated energy scale supports arguments for the overall turbostratic disorder. The success of this approximation in describing the structural parameters of the extended [(SnSe) 1+y ] m (VSe 2 ) n system encourages its use for other properties and for other similar systems with other chemistries.

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ChemInform Abstract: Synthesis, Structure and Electrical Properties of a New Tin Vanadium Selenide.

et al. 2013

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The intergrowth compound (SnSe)1.15VSe2 is prepared from the elements by physical vapor deposition using the modulated elemental reactant technique. The product is characterized by XRD, TEM, and electrical measurements. The structure contains alternating SnSe bilayers and VSe2 trilayers with extensive rotational disorder between the individual SnSe and VSe 2 constituents. The compound undergoes a charge or spin density wave transition, which has not been observed in previous misfit layer compounds. (SnSe)1.15VSe2 is a metal, but shows an abrupt increase in the resistivity between 30 and 100 K. -(ATKINS, R.; DISCH, S.; JONES, Z.; HAEUSLER, I.; GROSSE, C.; FISCHER, S. F.; NEUMANN, W.; ZSCHACK, P.; JOHNSON*, D. C.; J. Solid State Chem. 202 (2013) 128-133, http://dx.

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Synthesis, structure and electrical properties of a new tin vanadium selenide

Cited by 45 publications

References 37 publications

Insights from STEM and NBED studies into the local structure and growth mechanism of misfit layered compounds prepared using modulated reactants

Insights from STEM and NBED studies into the local structure and growth mechanism of misfit layered compounds prepared using modulated reactants

Density functional theory calculations of the turbostratically disordered compound[(SnSe)1+y]m(VS

ChemInform Abstract: Synthesis, Structure and Electrical Properties of a New Tin Vanadium Selenide.

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