EXAFS Investigations of the Local Thermal Properties of Solids

Fornasini, P.

doi:10.1380/ejssnt.2012.480

Cited by 5 publications

(2 citation statements)

References 52 publications

(84 reference statements)

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“…As expected, the expansion measured by EXAFS is larger than the crystallographic expansion owing to the effect of thermal vibrations perpendicular to the bond 10,29 …”

Section: A First-shell Bond Expansionsupporting

confidence: 71%

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Local vibrational properties of GaAs studied by extended X-ray absorption fine structure

Ahmed

Aquilanti

Novello

et al. 2013

The Journal of Chemical Physics

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Extended X-ray absorption fine structure (EXAFS) has been measured at both the K edges of gallium and arsenic in GaAs, from 14 to 300 K, to investigate the local vibrational and thermodynamic behaviour in terms of bond expansion, parallel, and perpendicular mean square relative displacements and third cumulant. The separate analysis of the two edges allows a self-consistent check of the results and suggests that a residual influence of Ga EXAFS at the As edge cannot be excluded. The relation between bond expansion, lattice expansion, and expansion due to anharmonicity of the effective potential is quantitatively clarified. The comparison with previous EXAFS results on other crystals with the diamond or zincblende structure shows that the values of a number of parameters determined from EXAFS are clearly correlated with the fractional ionicity and with the strength and temperature interval of the lattice negative expansion. © 2013 AIP Publishing LLC.

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“…As expected, the expansion measured by EXAFS is larger than the crystallographic expansion owing to the effect of thermal vibrations perpendicular to the bond 10,29 …”

Section: A First-shell Bond Expansionsupporting

confidence: 71%

“…The bond distance measured by the first EXAFS cumulant r can be expressed, by simple considerations of vibrational dynamics, 29 as…”

Section: B Bond Expansion and Crystallographic Expansionmentioning

confidence: 99%