An Electron and X-Ray Diffraction Investigation of Ni1+xTe2 and Ni1+xSe2CdI2/NiAs Type Solid Solution Phases

Norén, Lasse; Ting, Valeska P.; Withers, Raymond; Tendeloo, G. Van

doi:10.1006/jssc.2001.9309

Cited by 19 publications

(11 citation statements)

References 17 publications

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“…The powder XRD patterns in Figure 1d show no secondary phase and can be well indexed. The Rietveld refinements give the lattice parameters of a = 3.8550(9) Å , c = 5.2659(8) Å , consistent with the stoichiometric NiTe 2 in the literature 44,45 . More details on the XRD refinement can be found in the Supplementary Information.…”

Section: Resultssupporting

confidence: 81%

Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe₂

et al. 2018

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Type-II Dirac/Weyl semimetals are characterized by strongly tilted Dirac cones such that the Dirac/Weyl node emerges at the boundary of electron and hole pockets as a new state of quantum matter, distinct from the standard Dirac/Weyl points with a point-like Fermi surface which are referred to as type-I nodes. The type-II Dirac fermions were recently predicted by theory and have since been confirmed in experiments in the PtSe 2 -class of transition metal dichalcogenides. However, the Dirac nodes observed in PtSe 2 , PdTe 2 and PtTe 2 candidates are quite far away from the Fermi level, making the signature of topological fermions obscure as the physical properties are still dominated by the non-Dirac quasiparticles. Here we report the synthesis of a new type-II Dirac semimetal NiTe 2 in which a pair of type-II Dirac nodes are located very close to the Fermi level. The quantum oscillations in this material reveal a nontrivial Berry's phase associated with these Dirac fermions. Our first principles calculations further unveil a topological Dirac cone in its surface states. Therefore, NiTe 2 may not only represent an improved system to formulate the theoretical understanding of the exotic consequences of type-II Dirac fermions, it also facilitates possible applications based on these topological carriers.

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Section: Resultssupporting

confidence: 81%

Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe₂

et al. 2018

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“…The close relation of these structures to the Cu 2 Sb-type allotrope is well described by Gulay et al [17], who in a later paper determined the structure of the c1 phase [19]. Several authors have verified that the d phase experiences an order-disorder transition at about 54.8 at.% Te [18] and a maximum in the c-axis, with the Ni-rich side being of the NiAs-type disordered structure and the Te-rich side of CdI 2 -type ordering of defects into every other interstitial layer [12,13,18,[21][22][23]. Barstad et al [13] reported that there is no solubility of Te in FCC-Ni based on lattice parameter measurements, and Abakarov et al [24] published a solubility of 0.022 at.% Ni in Te at room temperature based on the same method.…”

Section: State Of the Art On The Ni-te System Phase Diagrams And Cryssupporting

confidence: 53%

“…1. Crystallographic data have been well studied for the b2, c1 and d phases (Table 1) [12,[17][18][19].…”

Section: State Of the Art On The Ni-te System Phase Diagrams And Crysmentioning

confidence: 99%

Thermodynamic assessment of the Ni–Te system

et al. 2019

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A thermodynamic assessment of the Ni-Te system has been performed using the Calphad method, based on experimental data available in the literature. The proposed description has been developed for use in the modeling of fissionproduct-induced internal corrosion of stainless steel cladding in Generation IV nuclear reactors. DFT calculations were performed to obtain 0 K properties of solid phases to assist the thermodynamic optimization. The ionic liquid twosublattice model was used, and most solution phases were modeled using interstitial metal sub-lattices. With a strict number of parameters, the resulting description satisfactorily reproduces all thermodynamic properties and hightemperature phase transitions. The metastable miscibility gap in the Ni-rich liquid that is experimentally suggested is not present in the final description. The d phase exhibits a metastable order-disorder transition between the CdI 2 and NiAs types of interstitial nickel distribution. The CdI 2 prototype is the stable space group at room temperature. Low-temperature ordering phase transitions have been disregarded in this description, since they are not of interest to the application of corrosion in nuclear reactors.

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“…However, taking into account that the intensity of this scattering only seems to be present at compositions Ni 1Àd (Ge, P) (indicating vacancies in the Ni octahedra) and that the position of these reflections are at ðx 0 1 3 Þ Ã h a possible interpretation turned out as feasible by recalling the reciprocal space of NiAs related structures in some binary systems. The reciprocal lattices of Co 2Àx Se 2 [4] and Ni 2Àx Se 2 [18] have been described in detail and are totally compatible with the extra scattering we observe in the Ni deficient crystallites. In Co 2Àx Se 2 and Ni 2Àx Se 2 , the extra scattering is inferred to originate from octahedral vacancies in every second octahedral layer (along the c h -axis).…”

Section: Article In Pressmentioning

confidence: 80%

X-ray powder diffraction and electron diffraction studies of the Ni1±yGe1−xPx system

García-García

Larsson

2005

Journal of Solid State Chemistry

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An Electron and X-Ray Diffraction Investigation of Ni1+xTe2 and Ni1+xSe2CdI2/NiAs Type Solid Solution Phases

Cited by 19 publications

References 17 publications

Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe₂

Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe₂

Thermodynamic assessment of the Ni–Te system

X-ray powder diffraction and electron diffraction studies of the Ni1±yGe1−xPx system

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An Electron and X-Ray Diffraction Investigation of Ni1+xTe2 and Ni1+xSe2CdI2/NiAs Type Solid Solution Phases

Cited by 19 publications

References 17 publications

Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2

Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2

Thermodynamic assessment of the Ni–Te system

X-ray powder diffraction and electron diffraction studies of the Ni1±yGe1−xPx system

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Product

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Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe₂

Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe₂