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Volumn 21, Issue 2, 2009, Pages 425-431

Anomalous thermal expansion of cuprites: a combined high resolution pair distribution function and geometric analysis

Author keywords

[No Author keywords available]

Indexed keywords

DYNAMIC DISTORTIONS; EDGE LENGTHS; EXPANSION-MECHANISMS; GEOMETRIC ANALYSIS; HIGH RESOLUTIONS; HIGH TEMPERATURE BEHAVIORS; HIGHER TEMPERATURES; IN-DEPTH ANALYSIS; ISOSTRUCTURAL; LOCAL STRUCTURES; LOW ENERGIES; NEGATIVE THERMAL EXPANSIONS; NOBLE METAL OXIDES; PAIR DISTRIBUTION FUNCTION ANALYSIS; PAIR DISTRIBUTION FUNCTIONS; STRUCTURAL FEATURES; STRUCTURAL INFORMATIONS; TEMPERATURE DEPENDENTS; TETRAHEDRAL GEOMETRIES; THERMAL EXPANSION BEHAVIORS; THERMAL POPULATIONS; TRANSVERSE DISPLACEMENTS; VARIABLE TEMPERATURES; VIBRATIONAL MECHANISMS; VIBRATIONAL MODES; X -RAY SCATTERINGS;

EID: 61849179179     PISSN: 08974756     EISSN: None     Source Type: Journal    
DOI: 10.1021/cm802900t     Document Type: Article
Times cited : (23)

References (74)
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    • Oxides with the delafossite structure, containing O-Cu/Ag-O linkages have been shown to have low-temperature NTE along a single crystallographic axis parallel to the O-Cu/Ag-O direction. See, for example, Li, J.; Yokochi, A.; Amos, T. G.; Sleight, A. W. Chem. Mater. 2002, 14, 2602-2606.
    • Oxides with the delafossite structure, containing O-Cu/Ag-O linkages have been shown to have low-temperature NTE along a single crystallographic axis parallel to the O-Cu/Ag-O direction. See, for example, Li, J.; Yokochi, A.; Amos, T. G.; Sleight, A. W. Chem. Mater. 2002, 14, 2602-2606.
  • 35
    • 61849147207 scopus 로고    scopus 로고
    • In oxides with the delafossite structure, the low-temperature uniaxial NTE switches to being strongly PTE at high temperature
    • In oxides with the delafossite structure, the low-temperature uniaxial NTE switches to being strongly PTE at high temperature.
  • 43
    • 61849127152 scopus 로고    scopus 로고
    • In the regular tetrahedron, all faces are equilateral triangles and all edges are of the same length
    • In the regular tetrahedron, all faces are equilateral triangles and all edges are of the same length.
  • 44
    • 61849152728 scopus 로고    scopus 로고
    • The enhanced sensitivity to the M centers is comparable to EXAFS studies, although PDF data are not limited to the first few coordination shells, are not subject to multiple scattering artifacts, and yield atomic distances directly, i.e, are not derived using a structural model
    • The enhanced sensitivity to the M centers is comparable to EXAFS studies, although PDF data are not limited to the first few coordination shells, are not subject to multiple scattering artifacts, and yield atomic distances directly, i.e., are not derived using a structural model.
  • 45
    • 61849101660 scopus 로고    scopus 로고
    • By contrast, in the crystallographic structure, with all atoms on special positions, the thermal expansion of all interatomic distances are constrained to be identical to the lattice expansion
    • By contrast, in the crystallographic structure, with all atoms on special positions, the thermal expansion of all interatomic distances are constrained to be identical to the lattice expansion.
  • 55
    • 61849169372 scopus 로고    scopus 로고
    • Based on the relative ratios of the center-vertex atom size
    • Based on the relative ratios of the center-vertex atom size
  • 56
    • 84868894525 scopus 로고    scopus 로고
    • Zn
    • 2O » Zn
    • 2O
  • 57
    • 84868894586 scopus 로고    scopus 로고
    • 2.
    • 2.
  • 58
    • 61849185495 scopus 로고    scopus 로고
    • quot;The square of the sum of the edge lengths of any simplex in m-space is less than or equal to the number of edges times the sum of squares of the lengths of its edges, with equality if and only if the simplex is regular.51
    • 51
  • 59
    • 61849087166 scopus 로고    scopus 로고
    • The circumsphere is the sphere containing the tetrahedron that passes through each of the vertices. The radius of this sphere is known as the circumradius.
    • The circumsphere is the sphere containing the tetrahedron that passes through each of the vertices. The radius of this sphere is known as the circumradius.
  • 60
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    • In the case of the regular tetrahedron vertex-vertex M-M' distance, dM-M, is given by dM-M, v6 × dM-O 1.633 × dM-O. This represents an upper bound for the vertex-vertex M-M' distance. For a fixed radius i.e. M-O distance, increasing distortion from regular tetrahedral geometry, through M-O-M' bending modes, induces a contraction of the average tetrahedral edge length
    • M-O. This represents an upper bound for the vertex-vertex M-M' distance. For a fixed radius (i.e. M-O distance), increasing distortion from regular tetrahedral geometry, through M-O-M' bending modes, induces a contraction of the average tetrahedral edge length.
  • 73
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    • Such metallophilic interactions have also been identified in delafossites, see
    • Such metallophilic interactions have also been identified in delafossites, see Kandpal, H. C; Seshadri, R. Solid State Sci. 2002, 4, 1045-1052
    • (2002) Solid State Sci , vol.4 , pp. 1045-1052
    • Kandpal, H.C.1    Seshadri, R.2
  • 74
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    • a similar mechanism may underlie the NTE-PTE crossover in those systems
    • (a similar mechanism may underlie the NTE-PTE crossover in those systems).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.