A TEM and XRD study of the SbNbSe 3 misfit layer structures

Oviedo, L.N. Salamanca; Gómez-Herrero, A.; Cánovas, Antonio; Otero-Dı́az, L.C.

doi:10.1016/s0968-4328(99)00142-0

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…The rectangular dashed lines and the crosses indicate their unit cells and positions of extinction spots in the reciprocal space, respectively. According to the length ratio of lattice constant a calculated from the interplanar distances of (200) I and (200) II , we can gain an irrational x = 2a II /a I ∼ 1.20, [4,6,17,26] which defines the incommensurability, crystal structure, and accurate formula of (MX) x (T X 2 ) y type misfit-layered compounds, in consistent with the results of X-ray refinement. [17] Besides, we notice the occurrence of weak satellite spots, which are due to the misfit between PbS and TiS 2 sublattices along the 𝑎 * axis.…”

Section: Tem Analysis Of the Misfit-layered Compound Pbtissupporting

confidence: 80%

Misfit-layered compound PbTiS ₃ with incommensurate modulation: Transmission electron microscopy analysis and transport properties

et al. 2013

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The microstructural characteristic of the misfit-layered compound PbTiS 3 has been studied with transmission electron microscopy. All the incommensurate modulation-induced satellite spots and main diffraction spots of basic sublattices can be indexed systematically with a superspace group method. Finally, the relationship between the electronic transport properties and the crystal structure is discussed.

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Section: Tem Analysis Of the Misfit-layered Compound Pbtissupporting

confidence: 80%

Misfit-layered compound PbTiS ₃ with incommensurate modulation: Transmission electron microscopy analysis and transport properties

et al. 2013

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“…Since the discovery, in 1977, of the first misfit compound “LaCrS 3 ”, many systems have been studied. − Most of the misfit layered compounds reported are based in a QH, QHH, or, rarely, a QHHH stacking sequence . More recently, by using the modulated elemental reactants technique (MER) metastable compounds, named ferecrystalline compounds, with compositions ([SnSe] 1+δ ) m (MoSe 2 ) n and ([SnSe] 1+δ ) m (NbSe 2 ) n with m , n up to 20 ( m and n denote the thickness of each layer) have been synthesized. , …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electron Microscopy Study of the Quaternary Misfit Layer Chalcogenides {(Bi,Nd)S}_1+δCrS₂ and {(Pb,Nd)Se}_1+δ(NbSe₂)₂

et al. 2020

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In the present work, two compounds, in the Bi–Nd–Cr–S and Pb–Nd–Nb–Se systems, not reported to date were synthesized. The chemical composition and the structural determination of these complex compounds, at atomic resolution, was performed through conventional and aberration-corrected electron microscopy including selected area electron diffraction, high resolution (HR) transmission electron microscopy (TEM), HR scanning TEM, and the analytical associated techniques X-ray energy-dispersive spectroscopy and electron energy-loss spectroscopy. The average compositions are [(Bi0.4,Nd0.6)S]1.25CrS2 and [(Pb0.5,Nd0.5)Se]1.15(Nb1.0Se2)2, respectively. By using these electron microscopy techniques, we confirmed that both compounds can be described in term of two interpenetrated sublattices that fit along a but do not fit along b, giving rise to an incommensurate modulation. A closer inspection along the stacking direction of the subcell has provided an ideal structural model for [(Bi0.4,Nd0.6)S]1.25CrS2 based on the intergrowth of one layer of CrS2, three atoms thick, (111) B1 type, and one layer of (Bi, Nd)Se, two atoms thick, (100) B1 type. In [(Pb0.5,Nd0.5)Se]1.15(Nb1.0Se2)2 we found that two layers of NbSe2, which adopt the 2H–NbSe2 polytype, alternate with one layer of (Pb, Nd)Se B1 type. In addition, crystals showing extended defects, associated with the weak interaction between the layers, were frequently found.

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“…This type of structures has been studied by single-crystal X-ray diffraction [13] and by electron microscopy [14][15][16]. Due to the mutually incommensurate character of the two composing sublattices, apart from the reflections of each subsystem, satellite reflections appear in the diffraction pattern.…”

Section: Introductionmentioning

confidence: 99%

Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85

Castillo‐Martínez¹,

Schönleber²,

Smaalen³

et al. 2008

Journal of Solid State Chemistry

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a b s t r a c tThe strontium chromium oxide [Sr 2 O 2 ][CrO 2 ] 1.85 misfit layer compound has been synthesised at highpressure and high-temperature conditions. Electron diffraction patterns and high-resolution transmission electron microscopy images along [001] show the misfit character of the different layers composing the structure with a supercell along the incommensurate parameter bE7b 1 E13b 2 . The modulated crystal structure has been refined within the superspace formalism against single-crystal X-ray diffraction data, employing the (3+1)-dimensional superspace group C 0 nmb(0s 2 0)0 0 s. The compound has a composite structure with lattice parameters a 1 ¼ 5.182(1) Å , b 1 ¼ 5.411(1) Å , c 1 ¼ 18.194(3) Å for the first, SrO, subsystem and the same a and c, but with b 2 ¼ 2.925(1) Å for the second, CrO 2 , subsystem. The layer stacking is similar to that of orthorhombic PbS(TiS 2 ) 1.18 , but with a much stronger intersubsytem bonding in the case of the oxide. The intersubsystem lattice mismatch is mainly handled by displacement modulations of the Sr atoms, correlated with modulations of the valence, the coordination and the anisotropic displacement parameters.

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A TEM and XRD study of the SbNbSe 3 misfit layer structures

Cited by 7 publications

References 6 publications

Misfit-layered compound PbTiS ₃ with incommensurate modulation: Transmission electron microscopy analysis and transport properties

Misfit-layered compound PbTiS ₃ with incommensurate modulation: Transmission electron microscopy analysis and transport properties

Synthesis and Electron Microscopy Study of the Quaternary Misfit Layer Chalcogenides {(Bi,Nd)S}_1+δCrS₂ and {(Pb,Nd)Se}_1+δ(NbSe₂)₂

Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85

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A TEM and XRD study of the SbNbSe 3 misfit layer structures

Cited by 7 publications

References 6 publications

Misfit-layered compound PbTiS 3 with incommensurate modulation: Transmission electron microscopy analysis and transport properties

Misfit-layered compound PbTiS 3 with incommensurate modulation: Transmission electron microscopy analysis and transport properties

Synthesis and Electron Microscopy Study of the Quaternary Misfit Layer Chalcogenides {(Bi,Nd)S}1+δCrS2 and {(Pb,Nd)Se}1+δ(NbSe2)2

Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85

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Misfit-layered compound PbTiS ₃ with incommensurate modulation: Transmission electron microscopy analysis and transport properties

Misfit-layered compound PbTiS ₃ with incommensurate modulation: Transmission electron microscopy analysis and transport properties

Synthesis and Electron Microscopy Study of the Quaternary Misfit Layer Chalcogenides {(Bi,Nd)S}_1+δCrS₂ and {(Pb,Nd)Se}_1+δ(NbSe₂)₂