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Volumn 81, Issue 24, 2010, Pages

Electronic structure and thermoelectric properties: PbBi2 Te4 and related intergrowth compounds

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EID: 77956303902     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.81.245119     Document Type: Article
Times cited : (52)

References (49)
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    • The crystal structure of hexagonal PbBi2 Te4 as determined from x-ray diffraction has Te atoms occupying two 6c sites, while one 3a and one 6c cite is occupied by Pb and Bi atoms. These are difficult to distinguish using x rays alone because of the similar atomic numbers. Therefore, there is an ambiguity concerning whether these two sites are occupied by Pb/Bi atoms separately (ordered phase) or with a statistical distribution (disordered phase) (see Refs.). The first view is supported by the present calculations, e.g., the agreement between the theoretical and experimental bond lengths (see text), and is also in accord with what would be expected based on crystal chemical considerations (bond lengths, coordination, and charge states)
    • The crystal structure of hexagonal PbBi 2 Te 4 as determined from x-ray diffraction has Te atoms occupying two 6 c sites, while one 3 a and one 6 c cite is occupied by Pb and Bi atoms. These are difficult to distinguish using x rays alone because of the similar atomic numbers. Therefore, there is an ambiguity concerning whether these two sites are occupied by Pb/Bi atoms separately (ordered phase) or with a statistical distribution (disordered phase) (see Refs.). The first view is supported by the present calculations, e.g., the agreement between the theoretical and experimental bond lengths (see text), and is also in accord with what would be expected based on crystal chemical considerations (bond lengths, coordination, and charge states).
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    • Note that in the case of Bi2 Te3 detailed comparison of the anisotropic resistivity with the anisotropy of the transport function σ/τ showed that the anisotropy of scattering time (τ) is less than 5% (see Ref.), while both the electrical and thermal conductivities are much more anisotropic
    • Note that in the case of Bi 2 Te 3 detailed comparison of the anisotropic resistivity with the anisotropy of the transport function σ / τ showed that the anisotropy of scattering time (τ) is less than 5% (see Ref.), while both the electrical and thermal conductivities are much more anisotropic.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.