Diffuse electron scattering of a region in the system Li2SnO3-CoO

Román, M. A. Castellanos; Guevara, Alfredo; Guzmán‐Mendoza, J.; Baños, L.; Heiras-Aguirre, J.L; Huanosta‐Tera, A.

doi:10.1016/s1359-6454(02)00467-6

Cited by 5 publications

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References 13 publications

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“…From the observation of SAED patterns at different orientations we have deduced that the shape of the diffuse scattered intensity in reciprocal space is close to the surface depicted in Figure , which can be represented by the following equation: This equation corresponds to a P-type minimal surface and is similar to the theoretical Fermi surface of a primitive cubic metal having one electron per atom . Such diffuse scattering contours have been reported for other systems, such as ZrN x 20 and metal oxides 5 SAED patterns from the sample with x = 0.30 that presented extended defects along 〈111〉*.…”

Section: Resultssupporting

confidence: 71%

“…18 Such diffuse scattering contours have been reported for other systems, such as ZrN x 20 and metal oxides. 21 Information about local coordination of the atoms can be obtained from energy-loss near edge structure (ELNES) data. 16,22 EEL spectra of MgS (NaCl-type), where Mg 2+ cations lie in octahedral coordination, and of MgYb 2 S 4 (spinel-type), where Mg 2+ cations lie in tetrahedral coordination, were acquired as Mg coordination standards, see Figure 4a and 4c.…”

Section: Resultsmentioning

confidence: 99%

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Order and Disorder in Rocksalt and Spinel Structures in the MgS−Yb₂S₃ System

et al. 2005

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The MgS-Yb 2 S 3 solid solution, which can be formulated as Mg 1-x Yb (2/3)x 0 (1/3)x S (0, cation vacancy), was studied in a wide composition range (0 e x e 0.75). The structure and microstructure characterizations of the samples were mainly performed via transmission electron microscopy (TEM) and associated techniques, such as X-ray energy dispersive spectroscopy (XEDS) and electron energy-loss spectroscopy (EELS). At low Yb 3+ contents (x e 0.30), the system presents an average NaCl-type structure. The selected area electron diffraction (SAED) patterns corresponding to these crystals show diffuse scattered intensity, which is related to short-range order in the cation sublattice. EELS studies indicate the existence of Mg 2+ in tetrahedral coordination, in addition to the octahedral coordination of the basic NaCl-type structure. Extended defects were observed perpendicular to 〈111〉 in the NaCl matrix for the x ) 0.30 sample. When x g 0.35, a phase with spinel-type structure is observed and characterized. Besides, different defects with different structure were also observed perpendicular to 〈111〉 in the spinel matrix for 0.35 e x e 0.45 samples.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Order and Disorder in Rocksalt and Spinel Structures in the MgS−Yb₂S₃ System

et al. 2005

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Does a Low Amount of Substituents Improve the Thermoelectric Properties of Cr2−xMxS3 (M = Ti, V, Sn)?

Groß

Ekici

Poschmann

et al. 2022

J. Electron. Mater.

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The effects of low-level partial cation substitution in Cr2−xMxS3 with M = Ti, V or Sn and x = 0.05 and 0.1 have been investigated regarding the long- and short-range crystal structures and thermoelectric properties. All substituted compounds crystallized in the equilibrium phase of Cr2S3, adopting the space group R$${\overline{\text{3}}}$$ 3 ¯ . Electron beam irradiation led to a phase transformation from space group R$${\overline{\text{3}}}$$ 3 ¯ to P$${\overline{\text{3}}}$$ 3 ¯ 1c with a subsequent appearance of diffuse scattering, indicating short-range ordering of cations in the partially occupied cation layers. Substitution of Cr by V led to a reduction in electrical conductivity and subsequently to a lower thermoelectric performance in comparison to the pristine material. In contrast, substitution with Ti yielded an improvement of the performance due to a higher electrical conductivity and a reasonably high Seebeck coefficient. Both Sn-substituted compounds contained only traces of Sn. Surprisingly, a significant improvement of the electrical conductivities could be observed in comparison to the pristine material as well as the other Cr2−xMxS3 materials.

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