Structural and electrical properties of layered tetradymite-like compounds in the GeTe—Bi2Te3 and GeTe—Sb2Te3 systems

Shelimova, L. E.; Karpinskii, O. G.; Zemskov, V. S.; Константинов, П. П.

doi:10.1007/bf02757928

Cited by 46 publications

(41 citation statements)

References 5 publications

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“…Samples of Ge-rich PCM phases are known [28,29] to contain structural and chemical inhomogeneities even after long-term annealing. Frequently, the crystals are characterized by a coherent and nanoscale intergrowth of rock salt type slabs with distinct thicknesses which are separated by neighboring Te-layers [30].…”

Section: Resultsmentioning

confidence: 99%

Precession Electron Diffraction – a versatile tool for the characterization of Phase Change Materials

Schürmann

Düppel

Buller

et al. 2011

Cryst. Res. Technol.

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Precession Electron Diffraction (PED) has become a versatile tool of Transmission Electron Microscopy (TEM) for enhancing its nanoscale characterization abilities. In this contribution the advantages of PED are demonstrated on bulk samples of Phase Change Materials (PCM) with the nominal compositions Ge 8 Sb 2 Te 11 and Ge 8 Bi 2 Te 11 . PED was applied in combination with High Resolution Transmission Electron Microscopy (HRTEM) to determine such homologous structures based on variable sequences of layered building units. The efficiency of PED can be shown by the identification of ordering which is not evident from the projection of the structure in HRTEM or by use of Selected Area Electron Diffraction (SAED). Simulations support the ability of PED for recording 3D structural information. The PED patterns of the PCM can be assigned to superstructures which exhibit specific distances between adjacent Te-Te double layers. PED was also performed to analyze the structural changes after massive irradiation of PCM crystals.

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Section: Resultsmentioning

confidence: 99%

Precession Electron Diffraction – a versatile tool for the characterization of Phase Change Materials

Schürmann

Düppel

Buller

et al. 2011

Cryst. Res. Technol.

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“…The chemical formula is described as (Sb 2 ) n (Sb 2 Te 3 ) m , where n and m are integers. The number of blocks denoted by n and m changes according to the composition . When the compound crystallises in a commensurately modulated structure, γ should be a rational number .…”

Section: Introductionmentioning

confidence: 99%

Crystal structures of X‐phase in the Sb–Te binary alloy system

Kifune

Fujita

Tachizawa

et al. 2013

Crystal Research and Technology

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It is well known that the Sb–Te binary system has a large number of incommensurately or commensurately modulated structures between Sb and Sb2Te3 compounds. These structures, which are long‐period trigonal stacking structures, possess their own modulation period γ, according to their composition in the thermal equilibrium. However, the structure of sputtered Sb–Te films with various compositions between the two compounds at both ends formed in a non‐thermal equilibrium showed smaller γ values, than those expected from their compositions without exception. A smaller γ value implies that its structure is closer to that of Sb with the shortest period in all Sb–Te modulated structures. With increase in temperature, all these transient structures with smaller γ, however, became stable, accompanying an increase of γ to acquire their original modulated structures.

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“…12 A homologous series of pseudobinary compounds, nGeTemBi 2 Te 3 , was intensively studied in terms of its thermoelectric, galvanomagnetic, and thermomagnetic properties. [27][28][29][30] Among them, GeBi 2 Te 4 was theoretically proposed as a member of the 3D TIs. [31][32][33] It was experimentally verified to be a 3D TI possessing a single TSS by an angleresolved photoemission spectroscopy (ARPES) experiment.…”

Section: Introductionmentioning

confidence: 99%

Observation of a highly spin-polarized topological surface state in GeBi2Te4

et al. 2012

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Spin polarization of a topological surface state for GeBi 2 Te 4 , the newly discovered three-dimensional topological insulator, has been studied by means of state-of-the-art spin-and angle-resolved photoemission spectroscopy. It has been revealed that the disorder in the crystal has a minor effect on the surface-state spin polarization, which is 70% near the Dirac point in the bulk energy gap region (∼180 meV). This finding promises not only to realize a highly spin-polarized surface-isolated transport but also to add functionality to its thermoelectric and thermomagnetic properties.

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Structural and electrical properties of layered tetradymite-like compounds in the GeTe—Bi2Te3 and GeTe—Sb2Te3 systems

Cited by 46 publications

References 5 publications

Precession Electron Diffraction – a versatile tool for the characterization of Phase Change Materials

Precession Electron Diffraction – a versatile tool for the characterization of Phase Change Materials

Crystal structures of X‐phase in the Sb–Te binary alloy system

Observation of a highly spin-polarized topological surface state in GeBi2Te4

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